Zod

✨ https://zod.dev ✨
TypeScript-first schema validation with static type inference

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## Table of contents > These docs have been translated into [Chinese](./README_ZH.md) and [Korean](./README_KO.md). - [Table of contents](#table-of-contents) - [Introduction](#introduction) - [Sponsors](#sponsors) - [Platinum](#platinum) - [Gold](#gold) - [Silver](#silver) - [Bronze](#bronze) - [Copper](#copper) - [Ecosystem](#ecosystem) - [Resources](#resources) - [API libraries](#api-libraries) - [Form integrations](#form-integrations) - [Zod to X](#zod-to-x) - [X to Zod](#x-to-zod) - [Mocking](#mocking) - [Powered by Zod](#powered-by-zod) - [Utilities for Zod](#utilities-for-zod) - [Installation](#installation) - [Requirements](#requirements) - [From `npm`](#from-npm) - [Basic usage](#basic-usage) - [Primitives](#primitives) - [Coercion for primitives](#coercion-for-primitives) - [Literals](#literals) - [Strings](#strings) - [Datetimes](#datetimes) - [Dates](#dates) - [Times](#times) - [IP addresses](#ip-addresses) - [IP ranges](#ip-ranges-cidr) - [Numbers](#numbers) - [BigInts](#bigints) - [NaNs](#nans) - [Booleans](#booleans) - [Dates](#dates-1) - [Zod enums](#zod-enums) - [Native enums](#native-enums) - [Optionals](#optionals) - [Nullables](#nullables) - [Objects](#objects) - [`.shape`](#shape) - [`.keyof`](#keyof) - [`.extend`](#extend) - [`.merge`](#merge) - [`.pick/.omit`](#pickomit) - [`.partial`](#partial) - [`.deepPartial`](#deeppartial) - [`.required`](#required) - [`.passthrough`](#passthrough) - [`.strict`](#strict) - [`.strip`](#strip) - [`.catchall`](#catchall) - [Arrays](#arrays) - [`.element`](#element) - [`.nonempty`](#nonempty) - [`.min/.max/.length`](#minmaxlength) - [Tuples](#tuples) - [Unions](#unions) - [Discriminated unions](#discriminated-unions) - [Records](#records) - [Record key type](#record-key-type) - [Maps](#maps) - [Sets](#sets) - [Intersections](#intersections) - [Recursive types](#recursive-types) - [ZodType with ZodEffects](#zodtype-with-zodeffects) - [JSON type](#json-type) - [Cyclical objects](#cyclical-objects) - [Promises](#promises) - [Instanceof](#instanceof) - [Functions](#functions) - [Preprocess](#preprocess) - [Custom schemas](#custom-schemas) - [Schema methods](#schema-methods) - [`.parse`](#parse) - [`.parseAsync`](#parseasync) - [`.safeParse`](#safeparse) - [`.safeParseAsync`](#safeparseasync) - [`.refine`](#refine) - [Arguments](#arguments) - [Customize error path](#customize-error-path) - [Asynchronous refinements](#asynchronous-refinements) - [Relationship to transforms](#relationship-to-transforms) - [`.superRefine`](#superrefine) - [Abort early](#abort-early) - [Type refinements](#type-refinements) - [`.transform`](#transform) - [Chaining order](#chaining-order) - [Validating during transform](#validating-during-transform) - [Relationship to refinements](#relationship-to-refinements) - [Async transforms](#async-transforms) - [`.default`](#default) - [`.describe`](#describe) - [`.catch`](#catch) - [`.optional`](#optional) - [`.nullable`](#nullable) - [`.nullish`](#nullish) - [`.array`](#array) - [`.promise`](#promise) - [`.or`](#or) - [`.and`](#and) - [`.brand`](#brand) - [`.readonly`](#readonly) - [`.pipe`](#pipe) - [You can use `.pipe()` to fix common issues with `z.coerce`.](#you-can-use-pipe-to-fix-common-issues-with-zcoerce) - [Guides and concepts](#guides-and-concepts) - [Type inference](#type-inference) - [Writing generic functions](#writing-generic-functions) - [Constraining allowable inputs](#constraining-allowable-inputs) - [Error handling](#error-handling) - [Error formatting](#error-formatting) - [Comparison](#comparison) - [Joi](#joi) - [Yup](#yup) - [io-ts](#io-ts) - [Runtypes](#runtypes) - [Ow](#ow) - [Changelog](#changelog) ## Introduction Zod is a TypeScript-first schema declaration and validation library. I'm using the term "schema" to broadly refer to any data type, from a simple `string` to a complex nested object. Zod is designed to be as developer-friendly as possible. The goal is to eliminate duplicative type declarations. With Zod, you declare a validator _once_ and Zod will automatically infer the static TypeScript type. It's easy to compose simpler types into complex data structures. Some other great aspects: - Zero dependencies - Works in Node.js and all modern browsers - Tiny: 8kb minified + zipped - Immutable: methods (e.g. `.optional()`) return a new instance - Concise, chainable interface - Functional approach: [parse, don't validate](https://lexi-lambda.github.io/blog/2019/11/05/parse-don-t-validate/) - Works with plain JavaScript too! You don't need to use TypeScript. ## Sponsors Sponsorship at any level is appreciated and encouraged. If you built a paid product using Zod, consider one of the [corporate tiers](https://github.com/sponsors/colinhacks).

Diamond

The most comprehensive User Management Platform
clerk.com

Platinum

Cut code review time & bugs in half
coderabbit.ai

Gold

The API platform for sending notifications
courier.com

Generate better SDKs for your APIs
liblab.com

Serverless Postgres — Ship faster
neon.tech

Build AI apps and workflows with Retool AI
retool.com

Generate best-in-class SDKs
stainlessapi.com

SDKs & Terraform providers for your API
speakeasy.com

Silver

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Trigger.dev	Transloadit	Infisical	Whop
CryptoJobsList	Plain.	Inngest	Storyblok
Mux

Bronze

### Ecosystem There are a growing number of tools that are built atop or support Zod natively! If you've built a tool or library on top of Zod, tell me about it [on Twitter](https://twitter.com/colinhacks) or [start a Discussion](https://github.com/colinhacks/zod/discussions). I'll add it below and tweet it out. #### Resources - [Total TypeScript Zod Tutorial](https://www.totaltypescript.com/tutorials/zod) by [@mattpocockuk](https://twitter.com/mattpocockuk) - [Fixing TypeScript's Blindspot: Runtime Typechecking](https://www.youtube.com/watch?v=rY_XqfSHock) by [@jherr](https://twitter.com/jherr) #### API libraries - [`tRPC`](https://github.com/trpc/trpc): Build end-to-end typesafe APIs without GraphQL. - [`@anatine/zod-nestjs`](https://github.com/anatine/zod-plugins/tree/main/packages/zod-nestjs): Helper methods for using Zod in a NestJS project. - [`zod-endpoints`](https://github.com/flock-community/zod-endpoints): Contract-first strictly typed endpoints with Zod. OpenAPI compatible. - [`zhttp`](https://github.com/evertdespiegeleer/zhttp): An OpenAPI compatible, strictly typed http library with Zod input and response validation. - [`domain-functions`](https://github.com/SeasonedSoftware/domain-functions/): Decouple your business logic from your framework using composable functions. With first-class type inference from end to end powered by Zod schemas. - [`@zodios/core`](https://github.com/ecyrbe/zodios): A typescript API client with runtime and compile time validation backed by axios and zod. - [`express-zod-api`](https://github.com/RobinTail/express-zod-api): Build Express-based APIs with I/O schema validation and custom middlewares. - [`tapiduck`](https://github.com/sumukhbarve/monoduck/blob/main/src/tapiduck/README.md): End-to-end typesafe JSON APIs with Zod and Express; a bit like tRPC, but simpler. - [`koa-zod-router`](https://github.com/JakeFenley/koa-zod-router): Create typesafe routes in Koa with I/O validation using Zod. - [`zod-sockets`](https://github.com/RobinTail/zod-sockets): Zod-powered Socket.IO microframework with I/O validation and built-in AsyncAPI specs - [`oas-tszod-gen`](https://github.com/inkognitro/oas-tszod-gen): Client SDK code generator to convert OpenApi v3 specifications into TS endpoint caller functions with Zod types. #### Form integrations - [`react-hook-form`](https://github.com/react-hook-form/resolvers#zod): A first-party Zod resolver for React Hook Form. - [`zod-validation-error`](https://github.com/causaly/zod-validation-error): Generate user-friendly error messages from `ZodError`s. - [`zod-formik-adapter`](https://github.com/robertLichtnow/zod-formik-adapter): A community-maintained Formik adapter for Zod. - [`react-zorm`](https://github.com/esamattis/react-zorm): Standalone `

` generation and validation for React using Zod. - [`zodix`](https://github.com/rileytomasek/zodix): Zod utilities for FormData and URLSearchParams in Remix loaders and actions. - [`conform`](https://conform.guide/api/zod/parseWithZod): A typesafe form validation library for progressive enhancement of HTML forms. Works with Remix and Next.js. - [`remix-params-helper`](https://github.com/kiliman/remix-params-helper): Simplify integration of Zod with standard URLSearchParams and FormData for Remix apps. - [`formik-validator-zod`](https://github.com/glazy/formik-validator-zod): Formik-compliant validator library that simplifies using Zod with Formik. - [`zod-i18n-map`](https://github.com/aiji42/zod-i18n): Useful for translating Zod error messages. - [`@modular-forms/solid`](https://github.com/fabian-hiller/modular-forms): Modular form library for SolidJS that supports Zod for validation. - [`houseform`](https://github.com/crutchcorn/houseform/): A React form library that uses Zod for validation. - [`sveltekit-superforms`](https://github.com/ciscoheat/sveltekit-superforms): Supercharged form library for SvelteKit with Zod validation. - [`mobx-zod-form`](https://github.com/MonoidDev/mobx-zod-form): Data-first form builder based on MobX & Zod. - [`@vee-validate/zod`](https://github.com/logaretm/vee-validate/tree/main/packages/zod): Form library for Vue.js with Zod schema validation. - [`zod-form-renderer`](https://github.com/thepeaklab/zod-form-renderer): Auto-infer form fields from zod schema and render them with react-hook-form with E2E type safety. - [`antd-zod`](https://github.com/MrBr/antd-zod): Zod adapter for Ant Design form fields validation. - [`frrm`](https://github.com/schalkventer/frrm): Tiny 0.5kb Zod-based, HTML form abstraction that goes brr. #### Zod to X - [`zod-to-ts`](https://github.com/sachinraja/zod-to-ts): Generate TypeScript definitions from Zod schemas. - [`zod-to-json-schema`](https://github.com/StefanTerdell/zod-to-json-schema): Convert your Zod schemas into [JSON Schemas](https://json-schema.org/). - [`@anatine/zod-openapi`](https://github.com/anatine/zod-plugins/tree/main/packages/zod-openapi): Converts a Zod schema to an OpenAPI v3.x `SchemaObject`. - [`zod-fast-check`](https://github.com/DavidTimms/zod-fast-check): Generate `fast-check` arbitraries from Zod schemas. - [`zod-dto`](https://github.com/kbkk/abitia/tree/master/packages/zod-dto): Generate Nest.js DTOs from a Zod schema. - [`fastify-type-provider-zod`](https://github.com/turkerdev/fastify-type-provider-zod): Create Fastify type providers from Zod schemas. - [`zod-to-openapi`](https://github.com/asteasolutions/zod-to-openapi): Generate full OpenAPI (Swagger) docs from Zod, including schemas, endpoints & parameters. - [`nestjs-graphql-zod`](https://github.com/incetarik/nestjs-graphql-zod): Generates NestJS GraphQL model classes from Zod schemas. Provides GraphQL method decorators working with Zod schemas. - [`zod-openapi`](https://github.com/samchungy/zod-openapi): Create full OpenAPI v3.x documentation from Zod schemas. - [`fastify-zod-openapi`](https://github.com/samchungy/fastify-zod-openapi): Fastify type provider, validation, serialization and @fastify/swagger support for Zod schemas. - [`typeschema`](https://typeschema.com/): Universal adapter for schema validation. - [`zodex`](https://github.com/commonbaseapp/zodex): (De)serialization for zod schemas #### X to Zod - [`ts-to-zod`](https://github.com/fabien0102/ts-to-zod): Convert TypeScript definitions into Zod schemas. - [`@runtyping/zod`](https://github.com/johngeorgewright/runtyping): Generate Zod from static types & JSON schema. - [`json-schema-to-zod`](https://github.com/StefanTerdell/json-schema-to-zod): Convert your [JSON Schemas](https://json-schema.org/) into Zod schemas. [Live demo](https://StefanTerdell.github.io/json-schema-to-zod-react/). - [`json-to-zod`](https://github.com/rsinohara/json-to-zod): Convert JSON objects into Zod schemas. [Live demo](https://rsinohara.github.io/json-to-zod-react/). - [`graphql-codegen-typescript-validation-schema`](https://github.com/Code-Hex/graphql-codegen-typescript-validation-schema): GraphQL Code Generator plugin to generate form validation schema from your GraphQL schema. - [`zod-prisma`](https://github.com/CarterGrimmeisen/zod-prisma): Generate Zod schemas from your Prisma schema. - [`Supervillain`](https://github.com/Southclaws/supervillain): Generate Zod schemas from your Go structs. - [`prisma-zod-generator`](https://github.com/omar-dulaimi/prisma-zod-generator): Emit Zod schemas from your Prisma schema. - [`drizzle-zod`](https://orm.drizzle.team/docs/zod): Emit Zod schemas from your Drizzle schema. - [`prisma-trpc-generator`](https://github.com/omar-dulaimi/prisma-trpc-generator): Emit fully implemented tRPC routers and their validation schemas using Zod. - [`zod-prisma-types`](https://github.com/chrishoermann/zod-prisma-types) Create Zod types from your Prisma models. - [`quicktype`](https://app.quicktype.io/): Convert JSON objects and JSON schemas into Zod schemas. - [`@sanity-typed/zod`](https://github.com/saiichihashimoto/sanity-typed/tree/main/packages/zod): Generate Zod Schemas from [Sanity Schemas](https://www.sanity.io/docs/schema-types). - [`java-to-zod`](https://github.com/ivangreene/java-to-zod): Convert POJOs to Zod schemas - [`Orval`](https://github.com/anymaniax/orval): Generate Zod schemas from OpenAPI schemas - [`Kubb`](https://github.com/kubb-labs/kubb): Generate SDKs and Zod schemas from your OpenAPI schemas #### Mocking - [`@anatine/zod-mock`](https://github.com/anatine/zod-plugins/tree/main/packages/zod-mock): Generate mock data from a Zod schema. Powered by [faker.js](https://github.com/faker-js/faker). - [`zod-mocking`](https://github.com/dipasqualew/zod-mocking): Generate mock data from your Zod schemas. - [`zod-fixture`](https://github.com/timdeschryver/zod-fixture): Use your zod schemas to automate the generation of non-relevant test fixtures in a deterministic way. - [`zocker`](https://zocker.sigrist.dev): Generate plausible mock-data from your schemas. - [`zodock`](https://github.com/ItMaga/zodock) Generate mock data based on Zod schemas. - [`zod-schema-faker`](https://github.com/soc221b/zod-schema-faker) Generates mock data from Zod schemas. Powered by [@faker-js/faker](https://github.com/faker-js/faker) and [randexp.js](https://github.com/fent/randexp.js) #### Powered by Zod - [`freerstore`](https://github.com/JacobWeisenburger/freerstore): Firestore cost optimizer. - [`slonik`](https://github.com/gajus/slonik/tree/gajus/add-zod-validation-backwards-compatible#runtime-validation-and-static-type-inference): Node.js Postgres client with strong Zod integration. - [`schemql`](https://github.com/a2lix/schemql): Enhances your SQL workflow by combining raw SQL with targeted type safety and schema validation. - [`soly`](https://github.com/mdbetancourt/soly): Create CLI applications with zod. - [`pastel`](https://github.com/vadimdemedes/pastel): Create CLI applications with react, zod, and ink. - [`zod-xlsx`](https://github.com/sidwebworks/zod-xlsx): A xlsx based resource validator using Zod schemas. - [`znv`](https://github.com/lostfictions/znv): Type-safe environment parsing and validation for Node.js with Zod schemas. - [`zod-config`](https://github.com/alexmarqs/zod-config): Load configurations across multiple sources with flexible adapters, ensuring type safety with Zod. - [`unplugin-environment`](https://github.com/r17x/js/tree/main/packages/unplugin-environment#readme): A plugin for loading enviroment variables safely with schema validation, simple with virtual module, type-safe with intellisense, and better DX 🔥 🚀 👷. Powered by Zod. - [`zod-struct`](https://codeberg.org/reesericci/zod-struct): Create runtime-checked structs with Zod. #### Utilities for Zod - [`zod_utilz`](https://github.com/JacobWeisenburger/zod_utilz): Framework agnostic utilities for Zod. - [`zod-playground`](https://github.com/marilari88/zod-playground): A tool for learning and testing Zod schema validation functionalities. [Link](https://zod-playground.vercel.app/). - [`zod-sandbox`](https://github.com/nereumelo/zod-sandbox): Controlled environment for testing zod schemas. [Live demo](https://zod-sandbox.vercel.app/). - [`zod-dev`](https://github.com/schalkventer/zod-dev): Conditionally disables Zod runtime parsing in production. - [`zod-accelerator`](https://github.com/duplojs/duplojs-zod-accelerator): Accelerates Zod's throughput up to ~100x. ## Installation ### Requirements - TypeScript 4.5+! - You must enable `strict` mode in your `tsconfig.json`. This is a best practice for all TypeScript projects. ```ts // tsconfig.json { // ... "compilerOptions": { // ... "strict": true } } ``` ### From `npm` ```sh npm install zod # npm deno add npm:zod # deno yarn add zod # yarn bun add zod # bun pnpm add zod # pnpm ``` Zod also publishes a canary version on every commit. To install the canary: ```sh npm install zod@canary # npm deno add npm:zod@canary # deno yarn add zod@canary # yarn bun add zod@canary # bun pnpm add zod@canary # pnpm ``` > The rest of this README assumes you are using npm and importing directly from the `"zod"` package. ## Basic usage Creating a simple string schema ```ts import { z } from "zod"; // creating a schema for strings const mySchema = z.string(); // parsing mySchema.parse("tuna"); // => "tuna" mySchema.parse(12); // => throws ZodError // "safe" parsing (doesn't throw error if validation fails) mySchema.safeParse("tuna"); // => { success: true; data: "tuna" } mySchema.safeParse(12); // => { success: false; error: ZodError } ``` Creating an object schema ```ts import { z } from "zod"; const User = z.object({ username: z.string(), }); User.parse({ username: "Ludwig" }); // extract the inferred type type User = z.infer; // { username: string } ``` ## Primitives ```ts import { z } from "zod"; // primitive values z.string(); z.number(); z.bigint(); z.boolean(); z.date(); z.symbol(); // empty types z.undefined(); z.null(); z.void(); // accepts undefined // catch-all types // allows any value z.any(); z.unknown(); // never type // allows no values z.never(); ``` ## Coercion for primitives Zod now provides a more convenient way to coerce primitive values. ```ts const schema = z.coerce.string(); schema.parse("tuna"); // => "tuna" schema.parse(12); // => "12" ``` During the parsing step, the input is passed through the `String()` function, which is a JavaScript built-in for coercing data into strings. ```ts schema.parse(12); // => "12" schema.parse(true); // => "true" schema.parse(undefined); // => "undefined" schema.parse(null); // => "null" ``` The returned schema is a normal `ZodString` instance so you can use all string methods. ```ts z.coerce.string().email().min(5); ``` **How coercion works** All primitive types support coercion. Zod coerces all inputs using the built-in constructors: `String(input)`, `Number(input)`, `new Date(input)`, etc. ```ts z.coerce.string(); // String(input) z.coerce.number(); // Number(input) z.coerce.boolean(); // Boolean(input) z.coerce.bigint(); // BigInt(input) z.coerce.date(); // new Date(input) ``` **Note** — Boolean coercion with `z.coerce.boolean()` may not work how you expect. Any [truthy](https://developer.mozilla.org/en-US/docs/Glossary/Truthy) value is coerced to `true`, and any [falsy](https://developer.mozilla.org/en-US/docs/Glossary/Falsy) value is coerced to `false`. ```ts const schema = z.coerce.boolean(); // Boolean(input) schema.parse("tuna"); // => true schema.parse("true"); // => true schema.parse("false"); // => true schema.parse(1); // => true schema.parse([]); // => true schema.parse(0); // => false schema.parse(""); // => false schema.parse(undefined); // => false schema.parse(null); // => false ``` For more control over coercion logic, consider using [`z.preprocess`](#preprocess) or [`z.pipe()`](#pipe). ## Literals Literal schemas represent a [literal type](https://www.typescriptlang.org/docs/handbook/2/everyday-types.html#literal-types), like `"hello world"` or `5`. ```ts const tuna = z.literal("tuna"); const twelve = z.literal(12); const twobig = z.literal(2n); // bigint literal const tru = z.literal(true); const terrificSymbol = Symbol("terrific"); const terrific = z.literal(terrificSymbol); // retrieve literal value tuna.value; // "tuna" ``` > Currently there is no support for Date literals in Zod. If you have a use case for this feature, please file an issue. ## Strings Zod includes a handful of string-specific validations. ```ts // validations z.string().max(5); z.string().min(5); z.string().length(5); z.string().email(); z.string().url(); z.string().emoji(); z.string().uuid(); z.string().nanoid(); z.string().cuid(); z.string().cuid2(); z.string().ulid(); z.string().regex(regex); z.string().includes(string); z.string().startsWith(string); z.string().endsWith(string); z.string().datetime(); // ISO 8601; by default only `Z` timezone allowed z.string().ip(); // defaults to allow both IPv4 and IPv6 z.string().cidr(); // defaults to allow both IPv4 and IPv6 // transforms z.string().trim(); // trim whitespace z.string().toLowerCase(); // toLowerCase z.string().toUpperCase(); // toUpperCase // added in Zod 3.23 z.string().date(); // ISO date format (YYYY-MM-DD) z.string().time(); // ISO time format (HH:mm:ss[.SSSSSS]) z.string().duration(); // ISO 8601 duration z.string().base64(); ``` > Check out [validator.js](https://github.com/validatorjs/validator.js) for a bunch of other useful string validation functions that can be used in conjunction with [Refinements](#refine). You can customize some common error messages when creating a string schema. ```ts const name = z.string({ required_error: "Name is required", invalid_type_error: "Name must be a string", }); ``` When using validation methods, you can pass in an additional argument to provide a custom error message. ```ts z.string().min(5, { message: "Must be 5 or more characters long" }); z.string().max(5, { message: "Must be 5 or fewer characters long" }); z.string().length(5, { message: "Must be exactly 5 characters long" }); z.string().email({ message: "Invalid email address" }); z.string().url({ message: "Invalid url" }); z.string().emoji({ message: "Contains non-emoji characters" }); z.string().uuid({ message: "Invalid UUID" }); z.string().includes("tuna", { message: "Must include tuna" }); z.string().startsWith("https://", { message: "Must provide secure URL" }); z.string().endsWith(".com", { message: "Only .com domains allowed" }); z.string().datetime({ message: "Invalid datetime string! Must be UTC." }); z.string().date({ message: "Invalid date string!" }); z.string().time({ message: "Invalid time string!" }); z.string().ip({ message: "Invalid IP address" }); z.string().cidr({ message: "Invalid CIDR" }); ``` ### Datetimes As you may have noticed, Zod string includes a few date/time related validations. These validations are regular expression based, so they are not as strict as a full date/time library. However, they are very convenient for validating user input. The `z.string().datetime()` method enforces ISO 8601; default is no timezone offsets and arbitrary sub-second decimal precision. ```ts const datetime = z.string().datetime(); datetime.parse("2020-01-01T00:00:00Z"); // pass datetime.parse("2020-01-01T00:00:00.123Z"); // pass datetime.parse("2020-01-01T00:00:00.123456Z"); // pass (arbitrary precision) datetime.parse("2020-01-01T00:00:00+02:00"); // fail (no offsets allowed) ``` Timezone offsets can be allowed by setting the `offset` option to `true`. ```ts const datetime = z.string().datetime({ offset: true }); datetime.parse("2020-01-01T00:00:00+02:00"); // pass datetime.parse("2020-01-01T00:00:00.123+02:00"); // pass (millis optional) datetime.parse("2020-01-01T00:00:00.123+0200"); // pass (millis optional) datetime.parse("2020-01-01T00:00:00.123+02"); // pass (only offset hours) datetime.parse("2020-01-01T00:00:00Z"); // pass (Z still supported) ``` Allow unqualified (timezone-less) datetimes with the `local` flag. ```ts const schema = z.string().datetime({ local: true }); schema.parse("2020-01-01T00:00:00"); // pass ``` You can additionally constrain the allowable `precision`. By default, arbitrary sub-second precision is supported (but optional). ```ts const datetime = z.string().datetime({ precision: 3 }); datetime.parse("2020-01-01T00:00:00.123Z"); // pass datetime.parse("2020-01-01T00:00:00Z"); // fail datetime.parse("2020-01-01T00:00:00.123456Z"); // fail ``` ### Dates > Added in Zod 3.23 The `z.string().date()` method validates strings in the format `YYYY-MM-DD`. ```ts const date = z.string().date(); date.parse("2020-01-01"); // pass date.parse("2020-1-1"); // fail date.parse("2020-01-32"); // fail ``` ### Times > Added in Zod 3.23 The `z.string().time()` method validates strings in the format `HH:MM:SS[.s+]`. The second can include arbitrary decimal precision. It does not allow timezone offsets of any kind. ```ts const time = z.string().time(); time.parse("00:00:00"); // pass time.parse("09:52:31"); // pass time.parse("23:59:59.9999999"); // pass (arbitrary precision) time.parse("00:00:00.123Z"); // fail (no `Z` allowed) time.parse("00:00:00.123+02:00"); // fail (no offsets allowed) ``` You can set the `precision` option to constrain the allowable decimal precision. ```ts const time = z.string().time({ precision: 3 }); time.parse("00:00:00.123"); // pass time.parse("00:00:00.123456"); // fail time.parse("00:00:00"); // fail ``` ### IP addresses By default `.ip()` allows both IPv4 and IPv6. ```ts const ip = z.string().ip(); ip.parse("192.168.1.1"); // pass ip.parse("84d5:51a0:9114:1855:4cfa:f2d7:1f12:7003"); // pass ip.parse("84d5:51a0:9114:1855:4cfa:f2d7:1f12:192.168.1.1"); // pass ip.parse("256.1.1.1"); // fail ip.parse("84d5:51a0:9114:gggg:4cfa:f2d7:1f12:7003"); // fail ``` You can additionally set the IP `version`. ```ts const ipv4 = z.string().ip({ version: "v4" }); ipv4.parse("84d5:51a0:9114:1855:4cfa:f2d7:1f12:7003"); // fail const ipv6 = z.string().ip({ version: "v6" }); ipv6.parse("192.168.1.1"); // fail ``` ### IP ranges (CIDR) Validate IP address ranges specified with [CIDR notation](https://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing). By default, `.cidr()` allows both IPv4 and IPv6. ```ts const cidr = z.string().cidr(); cidr.parse("192.168.0.0/24"); // pass cidr.parse("2001:db8::/32"); // pass ``` You can specify a version with the `version` parameter. ```ts const ipv4Cidr = z.string().cidr({ version: "v4" }); ipv4Cidr.parse("84d5:51a0:9114:1855:4cfa:f2d7:1f12:7003"); // fail const ipv6Cidr = z.string().cidr({ version: "v6" }); ipv6Cidr.parse("192.168.1.1"); // fail ``` ## Numbers You can customize certain error messages when creating a number schema. ```ts const age = z.number({ required_error: "Age is required", invalid_type_error: "Age must be a number", }); ``` Zod includes a handful of number-specific validations. ```ts z.number().gt(5); z.number().gte(5); // alias .min(5) z.number().lt(5); z.number().lte(5); // alias .max(5) z.number().int(); // value must be an integer z.number().positive(); // > 0 z.number().nonnegative(); // >= 0 z.number().negative(); // < 0 z.number().nonpositive(); // <= 0 z.number().multipleOf(5); // Evenly divisible by 5. Alias .step(5) z.number().finite(); // value must be finite, not Infinity or -Infinity z.number().safe(); // value must be between Number.MIN_SAFE_INTEGER and Number.MAX_SAFE_INTEGER ``` Optionally, you can pass in a second argument to provide a custom error message. ```ts z.number().lte(5, { message: "this👏is👏too👏big" }); ``` ## BigInts Zod includes a handful of bigint-specific validations. ```ts z.bigint().gt(5n); z.bigint().gte(5n); // alias `.min(5n)` z.bigint().lt(5n); z.bigint().lte(5n); // alias `.max(5n)` z.bigint().positive(); // > 0n z.bigint().nonnegative(); // >= 0n z.bigint().negative(); // < 0n z.bigint().nonpositive(); // <= 0n z.bigint().multipleOf(5n); // Evenly divisible by 5n. ``` ## NaNs You can customize certain error messages when creating a nan schema. ```ts const isNaN = z.nan({ required_error: "isNaN is required", invalid_type_error: "isNaN must be 'not a number'", }); ``` ## Booleans You can customize certain error messages when creating a boolean schema. ```ts const isActive = z.boolean({ required_error: "isActive is required", invalid_type_error: "isActive must be a boolean", }); ``` ## Dates Use z.date() to validate `Date` instances. ```ts z.date().safeParse(new Date()); // success: true z.date().safeParse("2022-01-12T00:00:00.000Z"); // success: false ``` You can customize certain error messages when creating a date schema. ```ts const myDateSchema = z.date({ required_error: "Please select a date and time", invalid_type_error: "That's not a date!", }); ``` Zod provides a handful of date-specific validations. ```ts z.date().min(new Date("1900-01-01"), { message: "Too old" }); z.date().max(new Date(), { message: "Too young!" }); ``` **Coercion to Date** Since [zod 3.20](https://github.com/colinhacks/zod/releases/tag/v3.20), use [`z.coerce.date()`](#coercion-for-primitives) to pass the input through `new Date(input)`. ```ts const dateSchema = z.coerce.date(); type DateSchema = z.infer; // type DateSchema = Date /* valid dates */ console.log(dateSchema.safeParse("2023-01-10T00:00:00.000Z").success); // true console.log(dateSchema.safeParse("2023-01-10").success); // true console.log(dateSchema.safeParse("1/10/23").success); // true console.log(dateSchema.safeParse(new Date("1/10/23")).success); // true /* invalid dates */ console.log(dateSchema.safeParse("2023-13-10").success); // false console.log(dateSchema.safeParse("0000-00-00").success); // false ``` For older zod versions, use [`z.preprocess`](#preprocess) like [described in this thread](https://github.com/colinhacks/zod/discussions/879#discussioncomment-2036276). ## Zod enums ```ts const FishEnum = z.enum(["Salmon", "Tuna", "Trout"]); type FishEnum = z.infer; // 'Salmon' | 'Tuna' | 'Trout' ``` `z.enum` is a Zod-native way to declare a schema with a fixed set of allowable _string_ values. Pass the array of values directly into `z.enum()`. Alternatively, use `as const` to define your enum values as a tuple of strings. See the [const assertion docs](https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-4.html#const-assertions) for details. ```ts const VALUES = ["Salmon", "Tuna", "Trout"] as const; const FishEnum = z.enum(VALUES); ``` This is not allowed, since Zod isn't able to infer the exact values of each element. ```ts const fish = ["Salmon", "Tuna", "Trout"]; const FishEnum = z.enum(fish); ``` **`.enum`** To get autocompletion with a Zod enum, use the `.enum` property of your schema: ```ts FishEnum.enum.Salmon; // => autocompletes FishEnum.enum; /* => { Salmon: "Salmon", Tuna: "Tuna", Trout: "Trout", } */ ``` You can also retrieve the list of options as a tuple with the `.options` property: ```ts FishEnum.options; // ["Salmon", "Tuna", "Trout"]; ``` **`.exclude/.extract()`** You can create subsets of a Zod enum with the `.exclude` and `.extract` methods. ```ts const FishEnum = z.enum(["Salmon", "Tuna", "Trout"]); const SalmonAndTrout = FishEnum.extract(["Salmon", "Trout"]); const TunaOnly = FishEnum.exclude(["Salmon", "Trout"]); ``` ## Native enums Zod enums are the recommended approach to defining and validating enums. But if you need to validate against an enum from a third-party library (or you don't want to rewrite your existing enums) you can use `z.nativeEnum()`. **Numeric enums** ```ts enum Fruits { Apple, Banana, } const FruitEnum = z.nativeEnum(Fruits); type FruitEnum = z.infer; // Fruits FruitEnum.parse(Fruits.Apple); // passes FruitEnum.parse(Fruits.Banana); // passes FruitEnum.parse(0); // passes FruitEnum.parse(1); // passes FruitEnum.parse(3); // fails ``` **String enums** ```ts enum Fruits { Apple = "apple", Banana = "banana", Cantaloupe, // you can mix numerical and string enums } const FruitEnum = z.nativeEnum(Fruits); type FruitEnum = z.infer; // Fruits FruitEnum.parse(Fruits.Apple); // passes FruitEnum.parse(Fruits.Cantaloupe); // passes FruitEnum.parse("apple"); // passes FruitEnum.parse("banana"); // passes FruitEnum.parse(0); // passes FruitEnum.parse("Cantaloupe"); // fails ``` **Const enums** The `.nativeEnum()` function works for `as const` objects as well. ⚠️ `as const` requires TypeScript 3.4+! ```ts const Fruits = { Apple: "apple", Banana: "banana", Cantaloupe: 3, } as const; const FruitEnum = z.nativeEnum(Fruits); type FruitEnum = z.infer; // "apple" | "banana" | 3 FruitEnum.parse("apple"); // passes FruitEnum.parse("banana"); // passes FruitEnum.parse(3); // passes FruitEnum.parse("Cantaloupe"); // fails ``` You can access the underlying object with the `.enum` property: ```ts FruitEnum.enum.Apple; // "apple" ``` ## Optionals You can make any schema optional with `z.optional()`. This wraps the schema in a `ZodOptional` instance and returns the result. ```ts const schema = z.optional(z.string()); schema.parse(undefined); // => returns undefined type A = z.infer; // string | undefined ``` For convenience, you can also call the `.optional()` method on an existing schema. ```ts const user = z.object({ username: z.string().optional(), }); type C = z.infer; // { username?: string | undefined }; ``` You can extract the wrapped schema from a `ZodOptional` instance with `.unwrap()`. ```ts const stringSchema = z.string(); const optionalString = stringSchema.optional(); optionalString.unwrap() === stringSchema; // true ``` ## Nullables Similarly, you can create nullable types with `z.nullable()`. ```ts const nullableString = z.nullable(z.string()); nullableString.parse("asdf"); // => "asdf" nullableString.parse(null); // => null ``` Or use the `.nullable()` method. ```ts const E = z.string().nullable(); // equivalent to nullableString type E = z.infer; // string | null ``` Extract the inner schema with `.unwrap()`. ```ts const stringSchema = z.string(); const nullableString = stringSchema.nullable(); nullableString.unwrap() === stringSchema; // true ``` ## Objects ```ts // all properties are required by default const Dog = z.object({ name: z.string(), age: z.number(), }); // extract the inferred type like this type Dog = z.infer; // equivalent to: type Dog = { name: string; age: number; }; ``` ### `.shape` Use `.shape` to access the schemas for a particular key. ```ts Dog.shape.name; // => string schema Dog.shape.age; // => number schema ``` ### `.keyof` Use `.keyof` to create a `ZodEnum` schema from the keys of an object schema. ```ts const keySchema = Dog.keyof(); keySchema; // ZodEnum<["name", "age"]> ``` ### `.extend` You can add additional fields to an object schema with the `.extend` method. ```ts const DogWithBreed = Dog.extend({ breed: z.string(), }); ``` You can use `.extend` to overwrite fields! Be careful with this power! ### `.merge` Equivalent to `A.extend(B.shape)`. ```ts const BaseTeacher = z.object({ students: z.array(z.string()) }); const HasID = z.object({ id: z.string() }); const Teacher = BaseTeacher.merge(HasID); type Teacher = z.infer; // => { students: string[], id: string } ``` > If the two schemas share keys, the properties of B overrides the property of A. The returned schema also inherits the "unknownKeys" policy (strip/strict/passthrough) and the catchall schema of B. ### `.pick/.omit` Inspired by TypeScript's built-in `Pick` and `Omit` utility types, all Zod object schemas have `.pick` and `.omit` methods that return a modified version. Consider this Recipe schema: ```ts const Recipe = z.object({ id: z.string(), name: z.string(), ingredients: z.array(z.string()), }); ``` To only keep certain keys, use `.pick` . ```ts const JustTheName = Recipe.pick({ name: true }); type JustTheName = z.infer; // => { name: string } ``` To remove certain keys, use `.omit` . ```ts const NoIDRecipe = Recipe.omit({ id: true }); type NoIDRecipe = z.infer; // => { name: string, ingredients: string[] } ``` ### `.partial` Inspired by the built-in TypeScript utility type [Partial](https://www.typescriptlang.org/docs/handbook/utility-types.html#partialtype), the `.partial` method makes all properties optional. Starting from this object: ```ts const user = z.object({ email: z.string(), username: z.string(), }); // { email: string; username: string } ``` We can create a partial version: ```ts const partialUser = user.partial(); // { email?: string | undefined; username?: string | undefined } ``` You can also specify which properties to make optional: ```ts const optionalEmail = user.partial({ email: true, }); /* { email?: string | undefined; username: string } */ ``` ### `.deepPartial` The `.partial` method is shallow — it only applies one level deep. There is also a "deep" version: ```ts const user = z.object({ username: z.string(), location: z.object({ latitude: z.number(), longitude: z.number(), }), strings: z.array(z.object({ value: z.string() })), }); const deepPartialUser = user.deepPartial(); /* { username?: string | undefined, location?: { latitude?: number | undefined; longitude?: number | undefined; } | undefined, strings?: { value?: string}[] } */ ``` > Important limitation: deep partials only work as expected in hierarchies of objects, arrays, and tuples. ### `.required` Contrary to the `.partial` method, the `.required` method makes all properties required. Starting from this object: ```ts const user = z .object({ email: z.string(), username: z.string(), }) .partial(); // { email?: string | undefined; username?: string | undefined } ``` We can create a required version: ```ts const requiredUser = user.required(); // { email: string; username: string } ``` You can also specify which properties to make required: ```ts const requiredEmail = user.required({ email: true, }); /* { email: string; username?: string | undefined; } */ ``` ### `.passthrough` By default Zod object schemas strip out unrecognized keys during parsing. ```ts const person = z.object({ name: z.string(), }); person.parse({ name: "bob dylan", extraKey: 61, }); // => { name: "bob dylan" } // extraKey has been stripped ``` Instead, if you want to pass through unknown keys, use `.passthrough()` . ```ts person.passthrough().parse({ name: "bob dylan", extraKey: 61, }); // => { name: "bob dylan", extraKey: 61 } ``` ### `.strict` By default Zod object schemas strip out unrecognized keys during parsing. You can _disallow_ unknown keys with `.strict()` . If there are any unknown keys in the input, Zod will throw an error. ```ts const person = z .object({ name: z.string(), }) .strict(); person.parse({ name: "bob dylan", extraKey: 61, }); // => throws ZodError ``` ### `.strip` You can use the `.strip` method to reset an object schema to the default behavior (stripping unrecognized keys). ### `.catchall` You can pass a "catchall" schema into an object schema. All unknown keys will be validated against it. ```ts const person = z .object({ name: z.string(), }) .catchall(z.number()); person.parse({ name: "bob dylan", validExtraKey: 61, // works fine }); person.parse({ name: "bob dylan", validExtraKey: false, // fails }); // => throws ZodError ``` Using `.catchall()` obviates `.passthrough()` , `.strip()` , or `.strict()`. All keys are now considered "known". ## Arrays ```ts const stringArray = z.array(z.string()); // equivalent const stringArray = z.string().array(); ``` Be careful with the `.array()` method. It returns a new `ZodArray` instance. This means the _order_ in which you call methods matters. For instance: ```ts z.string().optional().array(); // (string | undefined)[] z.string().array().optional(); // string[] | undefined ``` ### `.element` Use `.element` to access the schema for an element of the array. ```ts stringArray.element; // => string schema ``` ### `.nonempty` If you want to ensure that an array contains at least one element, use `.nonempty()`. ```ts const nonEmptyStrings = z.string().array().nonempty(); // the inferred type is now // [string, ...string[]] nonEmptyStrings.parse([]); // throws: "Array cannot be empty" nonEmptyStrings.parse(["Ariana Grande"]); // passes ``` You can optionally specify a custom error message: ```ts // optional custom error message const nonEmptyStrings = z.string().array().nonempty({ message: "Can't be empty!", }); ``` ### `.min/.max/.length` ```ts z.string().array().min(5); // must contain 5 or more items z.string().array().max(5); // must contain 5 or fewer items z.string().array().length(5); // must contain 5 items exactly ``` Unlike `.nonempty()` these methods do not change the inferred type. ## Tuples Unlike arrays, tuples have a fixed number of elements and each element can have a different type. ```ts const athleteSchema = z.tuple([ z.string(), // name z.number(), // jersey number z.object({ pointsScored: z.number(), }), // statistics ]); type Athlete = z.infer; // type Athlete = [string, number, { pointsScored: number }] ``` A variadic ("rest") argument can be added with the `.rest` method. ```ts const variadicTuple = z.tuple([z.string()]).rest(z.number()); const result = variadicTuple.parse(["hello", 1, 2, 3]); // => [string, ...number[]]; ``` ## Unions Zod includes a built-in `z.union` method for composing "OR" types. ```ts const stringOrNumber = z.union([z.string(), z.number()]); stringOrNumber.parse("foo"); // passes stringOrNumber.parse(14); // passes ``` Zod will test the input against each of the "options" in order and return the first value that validates successfully. For convenience, you can also use the [`.or` method](#or): ```ts const stringOrNumber = z.string().or(z.number()); ``` **Optional string validation:** To validate an optional form input, you can union the desired string validation with an empty string [literal](#literals). This example validates an input that is optional but needs to contain a [valid URL](#strings): ```ts const optionalUrl = z.union([z.string().url().nullish(), z.literal("")]); console.log(optionalUrl.safeParse(undefined).success); // true console.log(optionalUrl.safeParse(null).success); // true console.log(optionalUrl.safeParse("").success); // true console.log(optionalUrl.safeParse("https://zod.dev").success); // true console.log(optionalUrl.safeParse("not a valid url").success); // false ``` ## Discriminated unions A discriminated union is a union of object schemas that all share a particular key. ```ts type MyUnion = | { status: "success"; data: string } | { status: "failed"; error: Error }; ``` Such unions can be represented with the `z.discriminatedUnion` method. This enables faster evaluation, because Zod can check the _discriminator key_ (`status` in the example above) to determine which schema should be used to parse the input. This makes parsing more efficient and lets Zod report friendlier errors. With the basic union method, the input is tested against each of the provided "options", and in the case of invalidity, issues for all the "options" are shown in the zod error. On the other hand, the discriminated union allows for selecting just one of the "options", testing against it, and showing only the issues related to this "option". ```ts const myUnion = z.discriminatedUnion("status", [ z.object({ status: z.literal("success"), data: z.string() }), z.object({ status: z.literal("failed"), error: z.instanceof(Error) }), ]); myUnion.parse({ status: "success", data: "yippie ki yay" }); ``` You can extract a reference to the array of schemas with the `.options` property. ```ts myUnion.options; // [ZodObject<...>, ZodObject<...>] ``` To merge two or more discriminated unions, use `.options` with destructuring. ```ts const A = z.discriminatedUnion("status", [ /* options */ ]); const B = z.discriminatedUnion("status", [ /* options */ ]); const AB = z.discriminatedUnion("status", [...A.options, ...B.options]); ``` ## Records Record schemas are used to validate types such as `Record`. This is particularly useful for storing or caching items by ID. ```ts const User = z.object({ name: z.string() }); const UserStore = z.record(z.string(), User); type UserStore = z.infer; // => Record ``` The schema and inferred type can be used like so: ```ts const userStore: UserStore = {}; userStore["77d2586b-9e8e-4ecf-8b21-ea7e0530eadd"] = { name: "Carlotta", }; // passes userStore["77d2586b-9e8e-4ecf-8b21-ea7e0530eadd"] = { whatever: "Ice cream sundae", }; // TypeError ``` **A note on numerical keys** While `z.record(keyType, valueType)` is able to accept numerical key types and TypeScript's built-in Record type is `Record`, it's hard to represent the TypeScript type `Record` in Zod. As it turns out, TypeScript's behavior surrounding `[k: number]` is a little unintuitive: ```ts const testMap: { [k: number]: string } = { 1: "one", }; for (const key in testMap) { console.log(`${key}: ${typeof key}`); } // prints: `1: string` ``` As you can see, JavaScript automatically casts all object keys to strings under the hood. Since Zod is trying to bridge the gap between static and runtime types, it doesn't make sense to provide a way of creating a record schema with numerical keys, since there's no such thing as a numerical key in runtime JavaScript. ## Maps ```ts const stringNumberMap = z.map(z.string(), z.number()); type StringNumberMap = z.infer; // type StringNumberMap = Map ``` ## Sets ```ts const numberSet = z.set(z.number()); type NumberSet = z.infer; // type NumberSet = Set ``` Set schemas can be further constrained with the following utility methods. ```ts z.set(z.string()).nonempty(); // must contain at least one item z.set(z.string()).min(5); // must contain 5 or more items z.set(z.string()).max(5); // must contain 5 or fewer items z.set(z.string()).size(5); // must contain 5 items exactly ``` ## Intersections Intersections are useful for creating "logical AND" types. This is useful for intersecting two object types. ```ts const Person = z.object({ name: z.string(), }); const Employee = z.object({ role: z.string(), }); const EmployedPerson = z.intersection(Person, Employee); // equivalent to: const EmployedPerson = Person.and(Employee); ``` Though in many cases, it is recommended to use `A.merge(B)` to merge two objects. The `.merge` method returns a new `ZodObject` instance, whereas `A.and(B)` returns a less useful `ZodIntersection` instance that lacks common object methods like `pick` and `omit`. ```ts const a = z.union([z.number(), z.string()]); const b = z.union([z.number(), z.boolean()]); const c = z.intersection(a, b); type c = z.infer; // => number ``` ## Recursive types You can define a recursive schema in Zod, but because of a limitation of TypeScript, their type can't be statically inferred. Instead you'll need to define the type definition manually, and provide it to Zod as a "type hint". ```ts const baseCategorySchema = z.object({ name: z.string(), }); type Category = z.infer & { subcategories: Category[]; }; const categorySchema: z.ZodType = baseCategorySchema.extend({ subcategories: z.lazy(() => categorySchema.array()), }); categorySchema.parse({ name: "People", subcategories: [ { name: "Politicians", subcategories: [ { name: "Presidents", subcategories: [], }, ], }, ], }); // passes ``` Thanks to [crasite](https://github.com/crasite) for this example. ### ZodType with ZodEffects When using `z.ZodType` with `z.ZodEffects` ( [`.refine`](https://github.com/colinhacks/zod#refine), [`.transform`](https://github.com/colinhacks/zod#transform), [`preprocess`](https://github.com/colinhacks/zod#preprocess), etc... ), you will need to define the input and output types of the schema. `z.ZodType` ```ts const isValidId = (id: string): id is `${string}/${string}` => id.split("/").length === 2; const baseSchema = z.object({ id: z.string().refine(isValidId), }); type Input = z.input & { children: Input[]; }; type Output = z.output & { children: Output[]; }; const schema: z.ZodType = baseSchema.extend({ children: z.lazy(() => schema.array()), }); ``` Thanks to [marcus13371337](https://github.com/marcus13371337) and [JoelBeeldi](https://github.com/JoelBeeldi) for this example. ### JSON type If you want to validate any JSON value, you can use the snippet below. ```ts const literalSchema = z.union([z.string(), z.number(), z.boolean(), z.null()]); type Literal = z.infer; type Json = Literal | { [key: string]: Json } | Json[]; const jsonSchema: z.ZodType = z.lazy(() => z.union([literalSchema, z.array(jsonSchema), z.record(jsonSchema)]) ); jsonSchema.parse(data); ``` Thanks to [ggoodman](https://github.com/ggoodman) for suggesting this. ### Cyclical objects Despite supporting recursive schemas, passing cyclical data into Zod will cause an infinite loop in some cases. > To detect cyclical objects before they cause problems, consider [this approach](https://gist.github.com/colinhacks/d35825e505e635df27cc950776c5500b). ## Promises ```ts const numberPromise = z.promise(z.number()); ``` "Parsing" works a little differently with promise schemas. Validation happens in two parts: 1. Zod synchronously checks that the input is an instance of Promise (i.e. an object with `.then` and `.catch` methods.). 2. Zod uses `.then` to attach an additional validation step onto the existing Promise. You'll have to use `.catch` on the returned Promise to handle validation fai

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