Coverage

TypeSchema supports all major schema validation libraries:

Project	`wrap`	`validate`	`assert`	`Infer`	`InferIn`	Example schema
zod (opens in a new tab)	✅	✅	✅	✅	✅	`z.string()`
yup (opens in a new tab)	✅	✅	✅	✅	✅	`string()`
joi (opens in a new tab)	✅	✅	✅	❌	❌	`Joi.string()`
ajv (opens in a new tab)	✅	✅	✅	❌	❌	`{type: "string"}`
superstruct (opens in a new tab)	✅	✅	✅	✅	❌	`string()`
io-ts (opens in a new tab)	✅	✅	✅	✅	✅	`t.string`
ow (opens in a new tab) (^0.28.2)	✅	✅	✅	✅	✅	`ow.string`
typia (opens in a new tab)	✅	✅	✅	✅	✅	`typia.createAssert<string>()`
valibot (opens in a new tab)	✅	✅	✅	✅	✅	`string()`
typebox (opens in a new tab)	✅	✅	✅	✅	✅	`Type.String()`
deepkit (opens in a new tab)	✅	✅	✅	❌	❌	`typeOf<string>()`
effect (opens in a new tab)	✅	✅	✅	✅	✅	`S.string`
runtypes (opens in a new tab)	✅	✅	✅	✅	✅	`String`
arktype (opens in a new tab)	✅	✅	✅	✅	✅	`type('string')`

Custom validations are also supported:

export function assertString(data: unknown): string {
  if (typeof data !== 'string') {
    throw new Error('Expected a string, got: ' + data);
  }
  return data;
}
 
await validate(assertString, '123'); // {data: '123'}
await validate(assertString, 123); // {issues: [`ValidationIssue`]}
 
await assert(assertString, '123'); // '123'
await assert(assertString, 123); // throws `AggregateError`

Usage Reference