resolvers

Performant, flexible and extensible forms with easy to use validation.

React Hook Form Resolvers

This function allows you to use any external validation library such as Yup, Zod, Joi, Vest, Ajv and many others. The goal is to make sure you can seamlessly integrate whichever validation library you prefer. If you’re not using a library, you can always write your own logic to validate your forms.

Install

Install your preferred validation library alongside @hookform/resolvers.

npm install @hookform/resolvers # npm
yarn add @hookform/resolvers # yarn
pnpm install @hookform/resolvers # pnpm
bun install @hookform/resolvers # bun

Resolver Comparison

resolver	Infer values from schema	criteriaMode
AJV	❌	firstError | all
ata-validator	❌	firstError | all
Arktype	✅	firstError
class-validator	✅	firstError | all
computed-types	✅	firstError
Effect	✅	firstError | all
fluentvalidation-ts	❌	firstError
io-ts	✅	firstError
joi	❌	firstError | all
Nope	❌	firstError
Standard Schema	✅	firstError | all
Superstruct	✅	firstError
typanion	✅	firstError
typebox	✅	firstError | all
typeschema	❌	firstError | all
valibot	✅	firstError | all
vest	❌	firstError | all
vine	✅	firstError | all
yup	✅	firstError | all
zod	✅	firstError | all

TypeScript

Most of the resolvers can infer the output type from the schema. See comparison table for more details.

useForm<Input, Context, Output>()

Example:

import { useForm } from 'react-hook-form';
import { zodResolver } from '@hookform/resolvers/zod';
import { z } from 'zod'; // or 'zod/v4'

const schema = z.object({
  id: z.number(),
});

// Automatically infers the output type from the schema
useForm({
  resolver: zodResolver(schema),
});

// Force the output type
useForm<z.input<typeof schema>, any, z.output<typeof schema>>({
  resolver: zodResolver(schema),
});

Links

• React-hook-form validation resolver documentation

Table of Contents

• Install
• TypeScript
• Links
  • Table of Contents
• API
• Quickstart
  • Yup
  • Zod
  • Superstruct
  • Joi
  • Vest
  • Class Validator
  • io-ts
  • Nope
  • computed-types
  • typanion
  • Ajv
  • TypeBox
    • With ValueCheck
    • With TypeCompiler
    • Custom/third-party types
  • ArkType
  • Valibot
  • TypeSchema
  • effect-ts
  • VineJS
  • fluentvalidation-ts
  • standard-schema
  • ata-validator
• Backers
• Contributors

API

type Options = {
  mode: 'async' | 'sync',
  raw?: boolean
}

resolver(schema: object, schemaOptions?: object, resolverOptions: Options)

	type	Required	Description
schema	object	✓	validation schema
schemaOptions	object		validation library schema options
resolverOptions	object		resolver options, async is the default mode

Quickstart

Yup

Dead simple Object schema validation.

⚠️ Pass context via useForm({ context }), not via yupResolver’s schemaOptions. schemaOptions.context is overridden by the form context, so use the useForm context object instead.

// Correct
useForm({
  resolver: yupResolver(schema),
  context: { foo: true },
});

// Avoid - schemaOptions.context will be ignored/overridden
yupResolver(schema, { context: { foo: true } });

import { useForm } from 'react-hook-form';
import { yupResolver } from '@hookform/resolvers/yup';
import * as yup from 'yup';

const schema = yup
  .object()
  .shape({
    name: yup.string().required(),
    age: yup.number().required(),
  })
  .required();

const App = () => {
  const { register, handleSubmit } = useForm({
    resolver: yupResolver(schema),
  });

  return (
    <form => console.log(d))}>
      <input {...register('name')} />
      <input type="number" {...register('age')} />
      <input type="submit" />
    </form>
  );
};

Zod

TypeScript-first schema validation with static type inference

⚠️ Example below uses the valueAsNumber, which requires react-hook-form v6.12.0 (released Nov 28, 2020) or later.

import { useForm } from 'react-hook-form';
import { zodResolver } from '@hookform/resolvers/zod';
import { z } from 'zod'; // or 'zod/v4'

const schema = z.object({
  name: z.string().min(1, { message: 'Required' }),
  age: z.number().min(10),
});

const App = () => {
  const {
    register,
    handleSubmit,
    formState: { errors },
  } = useForm({
    resolver: zodResolver(schema),
  });

  return (
    <form => console.log(d))}>
      <input {...register('name')} />
      {errors.name?.message && <p>{errors.name?.message}</p>}
      <input type="number" {...register('age', { valueAsNumber: true })} />
      {errors.age?.message && <p>{errors.age?.message}</p>}
      <input type="submit" />
    </form>
  );
};

⚠️ If your schema uses .default(...) on a field, that field becomes optional on the schema’s input type (z.input) but stays required on its output type (z.output/z.infer) — the default only fills it in after validation. Passing a single generic to useForm<T> pins both to the same type and will conflict with zodResolver, which infers input and output separately. Either omit the generic and let it infer from resolver, or specify all three explicitly:

const schema = z.object({ debug_mode: z.boolean().default(true) });

useForm<z.input<typeof schema>, unknown, z.output<typeof schema>>({
  resolver: zodResolver(schema),
});

Superstruct

A simple and composable way to validate data in JavaScript (or TypeScript).

import { useForm } from 'react-hook-form';
import { superstructResolver } from '@hookform/resolvers/superstruct';
import { object, string, number } from 'superstruct';

const schema = object({
  name: string(),
  age: number(),
});

const App = () => {
  const { register, handleSubmit } = useForm({
    resolver: superstructResolver(schema),
  });

  return (
    <form => console.log(d))}>
      <input {...register('name')} />
      <input type="number" {...register('age', { valueAsNumber: true })} />
      <input type="submit" />
    </form>
  );
};

Joi

The most powerful data validation library for JS.

import { useForm } from 'react-hook-form';
import { joiResolver } from '@hookform/resolvers/joi';
import Joi from 'joi';

const schema = Joi.object({
  name: Joi.string().required(),
  age: Joi.number().required(),
});

const App = () => {
  const { register, handleSubmit } = useForm({
    resolver: joiResolver(schema),
  });

  return (
    <form => console.log(d))}>
      <input {...register('name')} />
      <input type="number" {...register('age')} />
      <input type="submit" />
    </form>
  );
};

Vest

Vest 🦺 Declarative Validation Testing.

import { useForm } from 'react-hook-form';
import { vestResolver } from '@hookform/resolvers/vest';
import { create, test, enforce } from 'vest';

const validationSuite = create((data = {}) => {
  test('username', 'Username is required', () => {
    enforce(data.username).isNotEmpty();
  });

  test('password', 'Password is required', () => {
    enforce(data.password).isNotEmpty();
  });
});

const App = () => {
  const { register, handleSubmit } = useForm({
    resolver: vestResolver(validationSuite),
  });

  return (
    <form => console.log(data))}>
      <input {...register('username')} />
      <input type="password" {...register('password')} />
      <input type="submit" />
    </form>
  );
};

Class Validator

Decorator-based property validation for classes.

⚠️ Remember to add these options to your tsconfig.json!

"strictPropertyInitialization": false,
"experimentalDecorators": true

import { useForm } from 'react-hook-form';
import { classValidatorResolver } from '@hookform/resolvers/class-validator';
import { Length, Min, IsEmail } from 'class-validator';

class User {
  @Length(2, 30)
  username: string;

  @IsEmail()
  email: string;
}

const resolver = classValidatorResolver(User);

const App = () => {
  const {
    register,
    handleSubmit,
    formState: { errors },
  } = useForm<User>({ resolver });

  return (
    <form => console.log(data))}>
      <input type="text" {...register('username')} />
      {errors.username && <span>{errors.username.message}</span>}
      <input type="text" {...register('email')} />
      {errors.email && <span>{errors.email.message}</span>}
      <input type="submit" value="Submit" />
    </form>
  );
};

io-ts

Validate your data with powerful decoders.

import React from 'react';
import { useForm } from 'react-hook-form';
import { ioTsResolver } from '@hookform/resolvers/io-ts';
import t from 'io-ts';
// you don't have to use io-ts-types, but it's very useful
import tt from 'io-ts-types';

const schema = t.type({
  username: t.string,
  age: tt.NumberFromString,
});

const App = () => {
  const { register, handleSubmit } = useForm({
    resolver: ioTsResolver(schema),
  });

  return (
    <form => console.log(d))}>
      <input {...register('username')} />
      <input type="number" {...register('age')} />
      <input type="submit" />
    </form>
  );
};

export default App;

Nope

A small, simple, and fast JS validator

import { useForm } from 'react-hook-form';
import { nopeResolver } from '@hookform/resolvers/nope';
import Nope from 'nope-validator';

const schema = Nope.object().shape({
  name: Nope.string().required(),
  age: Nope.number().required(),
});

const App = () => {
  const { register, handleSubmit } = useForm({
    resolver: nopeResolver(schema),
  });

  return (
    <form => console.log(d))}>
      <input {...register('name')} />
      <input type="number" {...register('age')} />
      <input type="submit" />
    </form>
  );
};

computed-types

TypeScript-first schema validation with static type inference

import { useForm } from 'react-hook-form';
import { computedTypesResolver } from '@hookform/resolvers/computed-types';
import Schema, { number, string } from 'computed-types';

const schema = Schema({
  username: string.min(1).error('username field is required'),
  age: number,
});

const App = () => {
  const {
    register,
    handleSubmit,
    formState: { errors },
  } = useForm({
    resolver: computedTypesResolver(schema),
  });

  return (
    <form => console.log(d))}>
      <input {...register('name')} />
      {errors.name?.message && <p>{errors.name?.message}</p>}
      <input type="number" {...register('age', { valueAsNumber: true })} />
      {errors.age?.message && <p>{errors.age?.message}</p>}
      <input type="submit" />
    </form>
  );
};

typanion

Static and runtime type assertion library with no dependencies

import { useForm } from 'react-hook-form';
import { typanionResolver } from '@hookform/resolvers/typanion';
import * as t from 'typanion';

const isUser = t.isObject({
  username: t.applyCascade(t.isString(), [t.hasMinLength(1)]),
  age: t.applyCascade(t.isNumber(), [
    t.isInteger(),
    t.isInInclusiveRange(1, 100),
  ]),
});

const App = () => {
  const {
    register,
    handleSubmit,
    formState: { errors },
  } = useForm({
    resolver: typanionResolver(isUser),
  });

  return (
    <form => console.log(d))}>
      <input {...register('name')} />
      {errors.name?.message && <p>{errors.name?.message}</p>}
      <input type="number" {...register('age')} />
      {errors.age?.message && <p>{errors.age?.message}</p>}
      <input type="submit" />
    </form>
  );
};

Ajv

The fastest JSON validator for Node.js and browser

import { useForm } from 'react-hook-form';
import { ajvResolver } from '@hookform/resolvers/ajv';

// must use `minLength: 1` to implement required field
const schema = {
  type: 'object',
  properties: {
    username: {
      type: 'string',
      minLength: 1,
      errorMessage: { minLength: 'username field is required' },
    },
    password: {
      type: 'string',
      minLength: 1,
      errorMessage: { minLength: 'password field is required' },
    },
  },
  required: ['username', 'password'],
  additionalProperties: false,
};

const App = () => {
  const {
    register,
    handleSubmit,
    formState: { errors },
  } = useForm({
    resolver: ajvResolver(schema),
  });

  return (
    <form => console.log(data))}>
      <input {...register('username')} />
      {errors.username && <span>{errors.username.message}</span>}
      <input {...register('password')} />
      {errors.password && <span>{errors.password.message}</span>}
      <button type="submit">submit</button>
    </form>
  );
};

TypeBox

JSON Schema Type Builder with Static Type Resolution for TypeScript

Requires typebox 1.x (npm install typebox). The legacy @sinclair/typebox 0.x package is no longer supported.

With Value

import { useForm } from 'react-hook-form';
import { typeboxResolver } from '@hookform/resolvers/typebox';
import { Type } from 'typebox';

const schema = Type.Object({
  username: Type.String({ minLength: 1 }),
  password: Type.String({ minLength: 1 }),
});

const App = () => {
  const { register, handleSubmit } = useForm({
    resolver: typeboxResolver(schema),
  });

  return (
    <form => console.log(d))}>
      <input {...register('username')} />
      <input type="password" {...register('password')} />
      <input type="submit" />
    </form>
  );
};

With Compile

A high-performance JIT of TypeBox, read more

import { useForm } from 'react-hook-form';
import { typeboxResolver } from '@hookform/resolvers/typebox';
import { Type } from 'typebox';
import { Compile } from 'typebox/compile';

const schema = Type.Object({
  username: Type.String({ minLength: 1 }),
  password: Type.String({ minLength: 1 }),
});

const typecheck = Compile(schema);

const App = () => {
  const { register, handleSubmit } = useForm({
    resolver: typeboxResolver(typecheck),
  });

  return (
    <form => console.log(d))}>
      <input {...register('username')} />
      <input type="password" {...register('password')} />
      <input type="submit" />
    </form>
  );
};

Custom formats

typeboxResolver validates using typebox’s own Value.Errors (or the compiled Validator), so custom string formats must be registered with TypeBox’s Format registry before they’re used:

import { Format } from 'typebox/format';

Format.Set('slug', (value) => /^[a-z0-9-]+$/.test(value));

Make sure this registration runs against the same typebox module instance the schema was built with.

ArkType

TypeScript’s 1:1 validator, optimized from editor to runtime

import { useForm } from 'react-hook-form';
import { arktypeResolver } from '@hookform/resolvers/arktype';
import { type } from 'arktype';

const schema = type({
  username: 'string>1',
  password: 'string>1',
});

const App = () => {
  const { register, handleSubmit } = useForm({
    resolver: arktypeResolver(schema),
  });

  return (
    <form => console.log(d))}>
      <input {...register('username')} />
      <input type="password" {...register('password')} />
      <input type="submit" />
    </form>
  );
};

Valibot

The modular and type safe schema library for validating structural data

import { useForm } from 'react-hook-form';
import { valibotResolver } from '@hookform/resolvers/valibot';
import * as v from 'valibot';

const schema = v.object({
  username: v.pipe(
    v.string('username is required'),
    v.minLength(3, 'Needs to be at least 3 characters'),
    v.endsWith('cool', 'Needs to end with `cool`'),
  ),
  password: v.string('password is required'),
});

const App = () => {
  const { register, handleSubmit } = useForm({
    resolver: valibotResolver(schema),
  });

  return (
    <form => console.log(d))}>
      <input {...register('username')} />
      <input type="password" {...register('password')} />
      <input type="submit" />
    </form>
  );
};

⚠️ If your schema uses v.transform(...) (or v.pipe(..., v.transform(...))) on a field, that field’s parsed output type can differ from what the user actually types (its input type) — e.g. a string input transformed into a number. Passing a single generic to useForm<T> pins both the submitted values and the handleSubmit payload to that one type, which conflicts with valibotResolver, since it infers input and output separately. Either omit the generic and let it infer from resolver, or specify all three explicitly:

const schema = v.object({
  name: v.string(),
  number: v.pipe(v.string(), v.transform(Number)),
});

useForm<v.InferInput<typeof schema>, unknown, v.InferOutput<typeof schema>>({
  resolver: valibotResolver(schema),
});

TypeSchema

Universal adapter for schema validation, compatible with any validation library

import { useForm } from 'react-hook-form';
import { typeschemaResolver } from '@hookform/resolvers/typeschema';
import { z } from 'zod';

// Use your favorite validation library
const schema = z.object({
  username: z.string().min(1, { message: 'Required' }),
  password: z.number().min(1, { message: 'Required' }),
});

const App = () => {
  const { register, handleSubmit } = useForm({
    resolver: typeschemaResolver(schema),
  });

  return (
    <form => console.log(d))}>
      <input {...register('username')} />
      <input type="password" {...register('password')} />
      <input type="submit" />
    </form>
  );
};

effect-ts

A powerful TypeScript framework that provides a fully-fledged functional effect system with a rich standard library. Requires effect v4 (use @hookform/resolvers v5 for effect v3).

import React from 'react';
import { useForm } from 'react-hook-form';
import { effectTsResolver } from '@hookform/resolvers/effect-ts';
import { Schema } from 'effect';

const schema = Schema.Struct({
  username: Schema.String.check(
    Schema.isNonEmpty({ message: 'username required' }),
  ),
  password: Schema.String.check(
    Schema.isNonEmpty({ message: 'password required' }),
  ),
});

type FormData = typeof schema.Type;

interface Props {
  onSubmit: (data: FormData) => void;
}

function TestComponent({ onSubmit }: Props) {
  const {
    register,
    handleSubmit,
    formState: { errors },
    // provide generic if TS has issues inferring types
  } = useForm<FormData>({
    resolver: effectTsResolver(schema),
  });

  return (
    <form
      <input {...register('username')} />
      {errors.username && <span role="alert">{errors.username.message}</span>}

      <input {...register('password')} />
      {errors.password && <span role="alert">{errors.password.message}</span>}

      <button type="submit">submit</button>
    </form>
  );
}

VineJS

VineJS is a form data validation library for Node.js

import { useForm } from 'react-hook-form';
import { vineResolver } from '@hookform/resolvers/vine';
import vine from '@vinejs/vine';

const schema = vine.create({
  username: vine.string().minLength(1),
  password: vine.string().minLength(1),
});

const App = () => {
  const {
    register,
    handleSubmit,
    formState: { errors },
  } = useForm({
    resolver: vineResolver(schema),
  });

  return (
    <form => console.log(d))}>
      <input {...register('username')} />
      {errors.username && <span role="alert">{errors.username.message}</span>}
      <input {...register('password')} />
      {errors.password && <span role="alert">{errors.password.message}</span>}
      <button type="submit">submit</button>
    </form>
  );
};

fluentvalidation-ts

A TypeScript-first library for building strongly-typed validation rules

import { useForm } from 'react-hook-form';
import { fluentValidationResolver } from '@hookform/resolvers/fluentvalidation-ts';
import { Validator } from 'fluentvalidation-ts';

class FormDataValidator extends Validator<FormData> {
  constructor() {
    super();

    this.ruleFor('username')
      .notEmpty()
      .withMessage('username is a required field');
    this.ruleFor('password')
      .notEmpty()
      .withMessage('password is a required field');
  }
}

const App = () => {
  const {
    register,
    handleSubmit,
    formState: { errors },
  } = useForm({
    resolver: fluentValidationResolver(new FormDataValidator()),
  });

  return (
    <form => console.log(d))}>
      <input {...register('username')} />
      {errors.username && <span role="alert">{errors.username.message}</span>}
      <input {...register('password')} />
      {errors.password && <span role="alert">{errors.password.message}</span>}
      <button type="submit">submit</button>
    </form>
  );
};

standard-schema

A standard interface for TypeScript schema validation libraries

Example zod

import { useForm } from 'react-hook-form';
import { standardSchemaResolver } from '@hookform/resolvers/standard-schema';
import { z } from 'zod';

const schema = z.object({
  name: z.string().min(1, { message: 'Required' }),
  age: z.number().min(10),
});

const App = () => {
  const {
    register,
    handleSubmit,
    formState: { errors },
  } = useForm({
    resolver: standardSchemaResolver(schema),
  });

  return (
    <form => console.log(d))}>
      <input {...register('name')} />
      {errors.name?.message && <p>{errors.name?.message}</p>}
      <input type="number" {...register('age', { valueAsNumber: true })} />
      {errors.age?.message && <p>{errors.age?.message}</p>}
      <input type="submit" />
    </form>
  );
};

Example arkType

import { useForm } from 'react-hook-form';
import { standardSchemaResolver } from '@hookform/resolvers/standard-schema';
import { type } from 'arktype';

const schema = type({
  username: 'string>1',
  password: 'string>1',
});

const App = () => {
  const { register, handleSubmit } = useForm({
    resolver: standardSchemaResolver(schema),
  });

  return (
    <form => console.log(d))}>
      <input {...register('username')} />
      <input type="password" {...register('password')} />
      <input type="submit" />
    </form>
  );
};

ata-validator

A JSON Schema-based validator for JavaScript and TypeScript

import { useForm } from 'react-hook-form';
import { ataResolver } from '@hookform/resolvers/ata-validator';

const schema = {
  type: 'object',
  properties: {
    username: {
      type: 'string',
      minLength: 1,
    },
    password: {
      type: 'string',
      minLength: 1,
    },
  },
  required: ['username', 'password'],
};

const App = () => {
  const {
    register,
    handleSubmit,
    formState: { errors },
  } = useForm({
    resolver: ataResolver(schema),
  });

  return (
    <form => console.log(data))}>
      <input {...register('username')} />
      {errors.username && <span>{errors.username.message}</span>}
      <input {...register('password')} />
      {errors.password && <span>{errors.password.message}</span>}
      <button type="submit">submit</button>
    </form>
  );
};

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