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TypeBox
JSON Schema Type Builder with Static Type Resolution for TypeScript
Install
Node
$ npm install @sinclair/typebox --saveDeno and ESM
import { Static, Type } from 'https://esm.sh/@sinclair/typebox'Example
import { Static, Type } from '@sinclair/typebox'
const T = Type.String() // const T = { type: 'string' }
type T = Static<typeof T> // type T = stringOverview
TypeBox is a type builder library that creates in-memory JSON Schema objects that can be statically inferred as TypeScript types. The schemas produced by this library are designed to match the static type checking rules of the TypeScript compiler. TypeBox enables one to create a unified type that can be statically checked by TypeScript and runtime asserted using standard JSON Schema validation.
TypeBox is designed to enable JSON schema to compose with the same flexibility as TypeScript’s type system. It can be used either as a simple tool to build up complex schemas or integrated into REST and RPC services to help validate data received over the wire.
License MIT
Contents
Usage
The following demonstrates TypeBox’s general usage.
import { Static, Type } from '@sinclair/typebox'
//--------------------------------------------------------------------------------------------
//
// Let's say you have the following type ...
//
//--------------------------------------------------------------------------------------------
type T = {
id: string,
name: string,
timestamp: number
}
//--------------------------------------------------------------------------------------------
//
// ... you can express this type in the following way.
//
//--------------------------------------------------------------------------------------------
const T = Type.Object({ // const T = {
id: Type.String(), // type: 'object',
name: Type.String(), // properties: {
timestamp: Type.Integer() // id: {
}) // type: 'string'
// },
// name: {
// type: 'string'
// },
// timestamp: {
// type: 'integer'
// }
// },
// required: [
// 'id',
// 'name',
// 'timestamp'
// ]
// }
//--------------------------------------------------------------------------------------------
//
// ... then infer back to the original static type this way.
//
//--------------------------------------------------------------------------------------------
type T = Static<typeof T> // type T = {
// id: string,
// name: string,
// timestamp: number
// }
//--------------------------------------------------------------------------------------------
//
// ... then use the type both as JSON schema and as a TypeScript type.
//
//--------------------------------------------------------------------------------------------
function receive(value: T) { // ... as a Type
if(JSON.validate(T, value)) { // ... as a Schema
// ok...
}
}Types
TypeBox provides a set of functions that allow you to compose JSON Schema similar to how you would compose static types with TypeScript. Each function creates a JSON schema fragment which can compose into more complex types. The schemas produced by TypeBox can be passed directly to any JSON Schema compliant validator, or used to reflect runtime metadata for a type.
Standard
The following table lists the standard TypeBox types.
┌────────────────────────────────┬─────────────────────────────┬────────────────────────────────┐
│ TypeBox │ TypeScript │ JSON Schema │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ const T = Type.Any() │ type T = any │ const T = { } │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ const T = Type.Unknown() │ type T = unknown │ const T = { } │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ const T = Type.String() │ type T = string │ const T = { │
│ │ │ type: 'string' │
│ │ │ } │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ const T = Type.Number() │ type T = number │ const T = { │
│ │ │ type: 'number' │
│ │ │ } │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ const T = Type.Integer() │ type T = number │ const T = { │
│ │ │ type: 'integer' │
│ │ │ } │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ const T = Type.Boolean() │ type T = boolean │ const T = { │
│ │ │ type: 'boolean' │
│ │ │ } │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ const T = Type.Null() │ type T = null │ const T = { │
│ │ │ type: 'null' │
│ │ │ } │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ const T = Type.RegEx(/foo/) │ type T = string │ const T = { │
│ │ │ type: 'string', │
│ │ │ pattern: 'foo' │
│ │ │ } │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ const T = Type.Literal(42) │ type T = 42 │ const T = { │
│ │ │ const: 42, │
│ │ │ type: 'number' │
│ │ │ } │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ const T = Type.Array( │ type T = number[] │ const T = { │
│ Type.Number() │ │ type: 'array', │
│ ) │ │ items: { │
│ │ │ type: 'number' │
│ │ │ } │
│ │ │ } │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ const T = Type.Object({ │ type T = { │ const T = { │
│ x: Type.Number(), │ x: number, │ type: 'object', │
│ y: Type.Number() │ y: number │ properties: { │
│ }) │ } │ x: { │
│ │ │ type: 'number' │
│ │ │ }, │
│ │ │ y: { │
│ │ │ type: 'number' │
│ │ │ } │
│ │ │ }, │
│ │ │ required: ['x', 'y'] │
│ │ │ } │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ const T = Type.Tuple([ │ type T = [number, number] │ const T = { │
│ Type.Number(), │ │ type: 'array', │
│ Type.Number() │ │ items: [{ │
│ ]) │ │ type: 'number' │
│ │ │ }, { │
│ │ │ type: 'number' │
│ │ │ }], │
│ │ │ additionalItems: false, │
│ │ │ minItems: 2, │
│ │ │ maxItems: 2 │
│ │ │ } │
│ │ │ │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ enum Foo { │ enum Foo { │ const T = { │
│ A, │ A, │ anyOf: [{ │
│ B │ B │ type: 'number', │
│ } │ } │ const: 0 │
│ │ │ }, { │
│ const T = Type.Enum(Foo) │ type T = Foo │ type: 'number', │
│ │ │ const: 1 │
│ │ │ }] │
│ │ │ } │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ const T = Type.KeyOf( │ type T = keyof { │ const T = { │
│ Type.Object({ │ x: number, │ anyOf: [{ │
│ x: Type.Number(), │ y: number │ type: 'string', │
│ y: Type.Number() │ } │ const: 'x' │
│ }) │ │ }, { │
│ ) │ │ type: 'string', │
│ │ │ const: 'y' │
│ │ │ }] │
│ │ │ } │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ const T = Type.Union([ │ type T = string | number │ const T = { │
│ Type.String(), │ │ anyOf: [{ │
│ Type.Number() │ │ type: 'string' │
│ ]) │ │ }, { │
│ │ │ type: 'number' │
│ │ │ }] │
│ │ │ } │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ const T = Type.Intersect([ │ type T = { │ const T = { │
│ Type.Object({ │ x: number │ type: 'object', │
│ x: Type.Number() │ } & { │ properties: { │
│ }), │ y: number │ x: { │
│ Type.Object({ │ } │ type: 'number' │
│ y: Type.Number() │ │ }, │
│ }) │ │ y: { │
│ ]) │ │ type: 'number' │
│ │ │ } │
│ │ │ }, │
│ │ │ required: ['x', 'y'] │
│ │ │ } │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ const T = Type.Never() │ type T = never │ const T = { │
│ │ │ allOf: [{ │
│ │ │ type: 'boolean', │
│ │ │ const: false │
│ │ │ }, { │
│ │ │ type: 'boolean', │
│ │ │ const: true │
│ │ │ }] │
│ │ │ } │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ const T = Type.Record( │ type T = Record< │ const T = { │
│ Type.String(), │ string, │ type: 'object', │
│ Type.Number() │ number, │ patternProperties: { │
│ ) │ > │ '^.*$': { │
│ │ │ type: 'number' │
│ │ │ } │
│ │ │ } │
│ │ │ } │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ const T = Type.Partial( │ type T = Partial<{ │ const T = { │
│ Type.Object({ │ x: number, │ type: 'object', │
│ x: Type.Number(), │ y: number │ properties: { │
│ y: Type.Number() | }> │ x: { │
│ }) │ │ type: 'number' │
│ ) │ │ }, │
│ │ │ y: { │
│ │ │ type: 'number' │
│ │ │ } │
│ │ │ } │
│ │ │ } │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ const T = Type.Required( │ type T = Required<{ │ const T = { │
│ Type.Object({ │ x?: number, │ type: 'object', │
│ x: Type.Optional( │ y?: number │ properties: { │
│ Type.Number() | }> │ x: { │
│ ), │ │ type: 'number' │
│ y: Type.Optional( │ │ }, │
│ Type.Number() │ │ y: { │
│ ) │ │ type: 'number' │
│ }) │ │ } │
│ ) │ │ }, │
│ │ │ required: ['x', 'y'] │
│ │ │ } │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ const T = Type.Pick( │ type T = Pick<{ │ const T = { │
│ Type.Object({ │ x: number, │ type: 'object', │
│ x: Type.Number(), │ y: number │ properties: { │
│ y: Type.Number() | }, 'x'> │ x: { │
│ }), ['x'] │ │ type: 'number' │
│ ) │ │ } │
│ │ │ }, │
│ │ │ required: ['x'] │
│ │ │ } │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ const T = Type.Omit( │ type T = Omit<{ │ const T = { │
│ Type.Object({ │ x: number, │ type: 'object', │
│ x: Type.Number(), │ y: number │ properties: { │
│ y: Type.Number() | }, 'x'> │ y: { │
│ }), ['x'] │ │ type: 'number' │
│ ) │ │ } │
│ │ │ }, │
│ │ │ required: ['y'] │
│ │ │ } │
│ │ │ │
└────────────────────────────────┴─────────────────────────────┴────────────────────────────────┘Modifiers
TypeBox provides modifiers that can be applied to an objects properties. This allows for optional and readonly to be applied to that property. The following table illustates how they map between TypeScript and JSON Schema.
┌────────────────────────────────┬─────────────────────────────┬────────────────────────────────┐
│ TypeBox │ TypeScript │ JSON Schema │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ const T = Type.Object({ │ type T = { │ const T = { │
│ name: Type.Optional( │ name?: string │ type: 'object', │
│ Type.String() │ } │ properties: { │
│ ) │ │ name: { │
│ }) │ │ type: 'string' │
│ │ │ } │
│ │ │ } │
│ │ │ } │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ const T = Type.Object({ │ type T = { │ const T = { │
│ name: Type.Readonly( │ readonly name: string │ type: 'object', │
│ Type.String() │ } │ properties: { │
│ ) │ │ name: { │
│ }) │ │ type: 'string' │
│ │ │ } │
│ │ │ }, │
│ │ │ required: ['name'] │
│ │ │ } │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ const T = Type.Object({ │ type T = { │ const T = { │
│ name: Type.ReadonlyOptional( │ readonly name?: string │ type: 'object', │
│ Type.String() │ } │ properties: { │
│ ) │ │ name: { │
│ }) │ │ type: 'string' │
│ │ │ } │
│ │ │ } │
│ │ │ } │
│ │ │ │
└────────────────────────────────┴─────────────────────────────┴────────────────────────────────┘Options
You can pass additional JSON schema options on the last argument of any given type. The following are some examples.
// string must be an email
const T = Type.String({ format: 'email' })
// number must be a multiple of 2
const T = Type.Number({ multipleOf: 2 })
// array must have at least 5 integer values
const T = Type.Array(Type.Integer(), { minItems: 5 })Extended
In addition to JSON schema types, TypeBox provides several extended types that allow for the composition of function and constructor types. These additional types are not valid JSON Schema and will not validate using typical JSON Schema validation. However, these types can be used to frame JSON schema and describe callable interfaces that may receive JSON validated data. These types are as follows.
┌────────────────────────────────┬─────────────────────────────┬────────────────────────────────┐
│ TypeBox │ TypeScript │ Extended Schema │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ const T = Type.Constructor([ │ type T = new ( │ const T = { │
│ Type.String(), │ arg0: string, │ type: 'constructor' │
│ Type.Number() │ arg1: number │ parameters: [{ │
│ ], Type.Boolean()) │ ) => boolean │ type: 'string' │
│ │ │ }, { │
│ │ │ type: 'number' │
│ │ │ }], │
│ │ │ return: { │
│ │ │ type: 'boolean' │
│ │ │ } │
│ │ │ } │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ const T = Type.Function([ │ type T = ( │ const T = { │
| Type.String(), │ arg0: string, │ type : 'function', │
│ Type.Number() │ arg1: number │ parameters: [{ │
│ ], Type.Boolean()) │ ) => boolean │ type: 'string' │
│ │ │ }, { │
│ │ │ type: 'number' │
│ │ │ }], │
│ │ │ return: { │
│ │ │ type: 'boolean' │
│ │ │ } │
│ │ │ } │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ const T = Type.Uint8Array() │ type T = Uint8Array │ const T = { │
│ │ │ type: 'object', │
│ │ │ specialized: 'Uint8Array' │
│ │ │ } │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ const T = Type.Promise( │ type T = Promise<string> │ const T = { │
│ Type.String() │ │ type: 'promise', │
│ ) │ │ item: { │
│ │ │ type: 'string' │
│ │ │ } │
│ │ │ } │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ const T = Type.Undefined() │ type T = undefined │ const T = { │
│ │ │ type: 'object', │
│ │ │ specialized: 'Undefined' │
│ │ │ } │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ const T = Type.Void() │ type T = void │ const T = { │
│ │ │ type: 'null' │
│ │ │ } │
│ │ │ │
└────────────────────────────────┴─────────────────────────────┴────────────────────────────────┘Reference
Use Type.Ref(...) to create referenced types. The target type must specify an $id.
const T = Type.String({ $id: 'T' }) // const T = {
// $id: 'T',
// type: 'string'
// }
const R = Type.Ref(T) // const R = {
// $ref: 'T'
// }Recursive
Use Type.Recursive(...) to create recursive types.
const Node = Type.Recursive(Node => Type.Object({ // const Node = {
id: Type.String(), // $id: 'Node',
nodes: Type.Array(Node) // type: 'object',
}), { $id: 'Node' }) // properties: {
// id: {
// type: 'string'
// },
// nodes: {
// type: 'array',
// items: {
// $ref: 'Node'
// }
// }
// },
// required: [
// 'id',
// 'nodes'
// ]
// }
type Node = Static<typeof Node> // type Node = {
// id: string
// nodes: Node[]
// }
function test(node: Node) {
const id = node.nodes[0].nodes[0] // id is string
.nodes[0].nodes[0]
.id
}Generic
Use functions to create generic types. The following creates a generic Nullable<T> type.
import { Type, Static, TSchema } from '@sinclair/typebox'
const Nullable = <T extends TSchema>(type: T) => Type.Union([type, Type.Null()])
const T = Nullable(Type.String()) // const T = {
// anyOf: [{
// type: 'string'
// }, {
// type: 'null'
// }]
// }
type T = Static<typeof T> // type T = string | null
const U = Nullable(Type.Number()) // const U = {
// anyOf: [{
// type: 'number'
// }, {
// type: 'null'
// }]
// }
type U = Static<typeof U> // type U = number | nullConditional
Use the conditional module to create Conditional Types. This module implements TypeScript’s structural equivalence checks to enable TypeBox types to be conditionally inferred at runtime. This module also provides the Extract and Exclude utility types which are expressed as conditional types in TypeScript.
The conditional module is provided as an optional import.
import { Conditional } from '@sinclair/typebox/conditional'The following table shows the TypeBox mappings between TypeScript and JSON schema.
┌────────────────────────────────┬─────────────────────────────┬────────────────────────────────┐
│ TypeBox │ TypeScript │ JSON Schema │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ const T = Conditional.Extends( │ type T = │ const T = { │
│ Type.String(), │ string extends number │ const: false, │
│ Type.Number(), │ true : false │ type: 'boolean' │
│ Type.Literal(true), │ │ } │
│ Type.Literal(false) │ │ │
│ ) │ │ │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ const T = Conditional.Extract( │ type T = Extract< │ const T = { │
│ Type.Union([ │ 'a' | 'b' | 'c', │ anyOf: [{ │
│ Type.Literal('a'), │ 'a' | 'f' │ const: 'a' │
│ Type.Literal('b'), │ > │ type: 'string' │
│ Type.Literal('c') │ │ }] │
│ ]), │ │ } │
│ Type.Union([ │ │ │
│ Type.Literal('a'), │ │ │
│ Type.Literal('f') │ │ │
│ ]) │ │ │
│ ) │ │ │
│ │ │ │
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
│ const T = Conditional.Exclude( │ type T = Exclude< │ const T = { │
│ Type.Union([ │ 'a' | 'b' | 'c', │ anyOf: [{ │
│ Type.Literal('a'), │ 'a' │ const: 'b', │
│ Type.Literal('b'), │ > │ type: 'string' │
│ Type.Literal('c') │ │ }, { │
│ ]), │ │ const: 'c', │
│ Type.Union([ │ │ type: 'string' │
│ Type.Literal('a') │ │ }] │
│ ]) │ │ } │
│ ) │ │ │
│ │ │ │
└────────────────────────────────┴─────────────────────────────┴────────────────────────────────┘Unsafe
Use Type.Unsafe(...) to create custom schemas with user defined inference rules.
const T = Type.Unsafe<string>({ type: 'number' }) // const T = {
// type: 'number'
// }
type T = Static<typeof T> // type T = stringThis function can be used to create custom schemas for validators that require specific schema representations. An example of this might be OpenAPI’s nullable and enum schemas which are not provided by TypeBox. The following demonstrates using Type.Unsafe(...) to create these types.
import { Type, Static, TSchema } from '@sinclair/typebox'
//--------------------------------------------------------------------------------------------
//
// Nullable<T>
//
//--------------------------------------------------------------------------------------------
function Nullable<T extends TSchema>(schema: T) {
return Type.Unsafe<Static<T> | null>({ ...schema, nullable: true })
}
const T = Nullable(Type.String()) // const T = {
// type: 'string',
// nullable: true
// }
type T = Static<typeof T> // type T = string | null
//--------------------------------------------------------------------------------------------
//
// StringEnum<string[]>
//
//--------------------------------------------------------------------------------------------
function StringEnum<T extends string[]>(values: [...T]) {
return Type.Unsafe<T[number]>({ type: 'string', enum: values })
}
const T = StringEnum(['A', 'B', 'C']) // const T = {
// enum: ['A', 'B', 'C']
// }
type T = Static<typeof T> // type T = 'A' | 'B' | 'C'Guards
Use the guard module to test if values are TypeBox types.
import { TypeGuard } from '@sinclair/typebox/guard'
const T = Type.String()
if(TypeGuard.TString(T)) {
// T is TString
}Strict
TypeBox schemas contain the Kind and Modifier symbol properties. These properties are provided to enable runtime type reflection on schemas, as well as helping TypeBox internally compose types. These properties are not strictly valid JSON schema; so in some cases it may be desirable to omit them. TypeBox provides a Type.Strict() function that will omit these properties if necessary.
const T = Type.Object({ // const T = {
name: Type.Optional(Type.String()) // [Kind]: 'Object',
}) // type: 'object',
// properties: {
// name: {
// [Kind]: 'String',
// type: 'string',
// [Modifier]: 'Optional'
// }
// }
// }
const U = Type.Strict(T) // const U = {
// type: 'object',
// properties: {
// name: {
// type: 'string'
// }
// }
// }Values
TypeBox includes an optional values module that can be used to perform common operations on JavaScript values. This module enables one to create, check and cast values from types. It also provides functionality to check equality, clone and diff and patch JavaScript values. The value module is provided as an optional import.
import { Value } from '@sinclair/typebox/value'Create
Use the Create function to create a value from a TypeBox type. TypeBox will use default values if specified.
const T = Type.Object({ x: Type.Number(), y: Type.Number({ default: 42 }) })
const A = Value.Create(T) // const A = { x: 0, y: 42 }Clone
Use the Clone function to deeply clone a value
const A = Value.Clone({ x: 1, y: 2, z: 3 }) // const A = { x: 1, y: 2, z: 3 }Check
Use the Check function to type check a value
const T = Type.Object({ x: Type.Number() })
const R = Value.Check(T, { x: 1 }) // const R = trueCast
Use the Cast function to cast a value into a type. The cast function will retain as much information as possible from the original value.
const T = Type.Object({ x: Type.Number(), y: Type.Number() }, { additionalProperties: false })
const X = Value.Cast(T, null) // const X = { x: 0, y: 0 }
const Y = Value.Cast(T, { x: 1 }) // const Y = { x: 1, y: 0 }
const Z = Value.Cast(T, { x: 1, y: 2, z: 3 }) // const Z = { x: 1, y: 2 }Equal
Use the Equal function to deeply check for value equality.
const R = Value.Equal( // const R = true
{ x: 1, y: 2, z: 3 },
{ x: 1, y: 2, z: 3 }
)Diff
Use the Diff function to produce a sequence of edits to transform one value into another.
const E = Value.Diff<any>( // const E = [
{ x: 1, y: 2, z: 3 }, // { type: 'update', path: '/y', value: 4 },
{ y: 4, z: 5, w: 6 } // { type: 'update', path: '/z', value: 5 },
) // { type: 'insert', path: '/w', value: 6 },
// { type: 'delete', path: '/x' }
// ]Patch
Use the Patch function to apply edits
const A = { x: 1, y: 2 }
const B = { x: 3 }
const E = Value.Diff<any>(A, B) // const E = [
// { type: 'update', path: '/x', value: 3 },
// { type: 'delete', path: '/y' }
// ]
const C = Value.Patch<any>(A, E) // const C = { x: 3 }Errors
Use the Errors function enumerate validation errors.
const T = Type.Object({ x: Type.Number(), y: Type.Number() })
const R = [...Value.Errors(T, { x: '42' })] // const R = [{
// schema: { type: 'number' },
// path: '/x',
// value: '42',
// message: 'Expected number'
// }, {
// schema: { type: 'number' },
// path: '/y',
// value: undefined,
// message: 'Expected number'
// }]Pointer
Use ValuePointer to perform mutable updates on existing values using RFC6901 Json Pointers.
import { ValuePointer } from '@sinclair/typebox/value'
const A = { x: 0, y: 0, z: 0 }
ValuePointer.Set(A, '/x', 1) // const A = { x: 1, y: 0, z: 0 }
ValuePointer.Set(A, '/y', 1) // const A = { x: 1, y: 1, z: 0 }
ValuePointer.Set(A, '/z', 1) // const A = { x: 1, y: 1, z: 1 }TypeCheck
TypeBox is written to target JSON Schema Draft 6 and can be used with any Draft 6 compliant validator. TypeBox is developed and tested against Ajv and can be used in any application already making use of this validator. Additionally, TypeBox also provides an optional type compiler that can be used to attain improved compilation and validation performance for certain application types.
Ajv
The following example shows setting up Ajv to work with TypeBox.
$ npm install ajv ajv-formats --saveimport { Type } from '@sinclair/typebox'
import addFormats from 'ajv-formats'
import Ajv from 'ajv'
//--------------------------------------------------------------------------------------------
//
// Setup Ajv validator with the following options and formats
//
//--------------------------------------------------------------------------------------------
const ajv = addFormats(new Ajv({}), [
'date-time',
'time',
'date',
'email',
'hostname',
'ipv4',
'ipv6',
'uri',
'uri-reference',
'uuid',
'uri-template',
'json-pointer',
'relative-json-pointer',
'regex'
])
//--------------------------------------------------------------------------------------------
//
// Create a TypeBox type
//
//--------------------------------------------------------------------------------------------
const T = Type.Object({
x: Type.Number(),
y: Type.Number(),
z: Type.Number()
})
//--------------------------------------------------------------------------------------------
//
// Validate Data
//
//--------------------------------------------------------------------------------------------
const R = ajv.validate(T, { x: 1, y: 2, z: 3 }) // const R = trueCompiler
TypeBox provides an optional high performance just-in-time (JIT) compiler and type checker that can be used in applications that require extremely fast validation. Note that this compiler is optimized for TypeBox types only where the schematics are known in advance. If defining custom types with Type.Unsafe<T> please consider Ajv.
The compiler module is provided as an optional import.
import { TypeCompiler } from '@sinclair/typebox/compiler'Use the Compile(...) function to compile a type.
const C = TypeCompiler.Compile(Type.Object({ // const C: TypeCheck<TObject<{
x: Type.Number(), // x: TNumber;
y: Type.Number(), // y: TNumber;
z: Type.Number() // z: TNumber;
})) // }>>
const R = C.Check({ x: 1, y: 2, z: 3 }) // const R = trueValidation errors can be read with the Errors(...) function.
const C = TypeCompiler.Compile(Type.Object({ // const C: TypeCheck<TObject<{
x: Type.Number(), // x: TNumber;
y: Type.Number(), // y: TNumber;
z: Type.Number() // z: TNumber;
})) // }>>
const value = { }
const errors = [...C.Errors(value)] // const errors = [{
// schema: { type: 'number' },
// path: '/x',
// value: undefined,
// message: 'Expected number'
// }, {
// schema: { type: 'number' },
// path: '/y',
// value: undefined,
// message: 'Expected number'
// }, {
// schema: { type: 'number' },
// path: '/z',
// value: undefined,
// message: 'Expected number'
// }]Compiled routines can be inspected with the .Code() function.
const C = TypeCompiler.Compile(Type.String()) // const C: TypeCheck<TString>
console.log(C.Code()) // return function check(value) {
// return (
// (typeof value === 'string')
// )
// }Formats
Use the format module to create user defined string formats. The format module is used by the Value and TypeCompiler modules only. If using Ajv, please refer to the official Ajv format documentation located here.
The format module is an optional import.
import { Format } from '@sinclair/typebox/format'The following creates a palindrome string format.
Format.Set('palindrome', value => value === value.split('').reverse().join(''))Once set, this format can then be used by the TypeCompiler and Value modules.
const T = Type.String({ format: 'palindrome' })
const A = TypeCompiler.Compile(T).Check('engine') // const A = false
const B = Value.Check(T, 'kayak') // const B = trueBenchmark
This project maintains a set of benchmarks that measure Ajv, Value and TypeCompiler compilation and validation performance. These benchmarks can be run locally by cloning this repository and running npm run benchmark. The results below show for Ajv version 8.11.0.
For additional comparative benchmarks, please refer to typescript-runtime-type-benchmarks.
Compile
This benchmark measures compilation performance for varying types. You can review this benchmark here.
┌──────────────────┬────────────┬──────────────┬──────────────┬──────────────┐
│ (index) │ Iterations │ Ajv │ TypeCompiler │ Performance │
├──────────────────┼────────────┼──────────────┼──────────────┼──────────────┤
│ Number │ 2000 │ ' 384 ms' │ ' 9 ms' │ ' 42.67 x' │
│ String │ 2000 │ ' 322 ms' │ ' 8 ms' │ ' 40.25 x' │
│ Boolean │ 2000 │ ' 310 ms' │ ' 6 ms' │ ' 51.67 x' │
│ Null │ 2000 │ ' 271 ms' │ ' 6 ms' │ ' 45.17 x' │
│ RegEx │ 2000 │ ' 491 ms' │ ' 12 ms' │ ' 40.92 x' │
│ ObjectA │ 2000 │ ' 2935 ms' │ ' 44 ms' │ ' 66.70 x' │
│ ObjectB │ 2000 │ ' 3076 ms' │ ' 30 ms' │ ' 102.53 x' │
│ Tuple │ 2000 │ ' 1274 ms' │ ' 22 ms' │ ' 57.91 x' │
│ Union │ 2000 │ ' 1281 ms' │ ' 22 ms' │ ' 58.23 x' │
│ Vector4 │ 2000 │ ' 1602 ms' │ ' 17 ms' │ ' 94.24 x' │
│ Matrix4 │ 2000 │ ' 959 ms' │ ' 10 ms' │ ' 95.90 x' │
│ Literal_String │ 2000 │ ' 337 ms' │ ' 6 ms' │ ' 56.17 x' │
│ Literal_Number │ 2000 │ ' 376 ms' │ ' 5 ms' │ ' 75.20 x' │
│ Literal_Boolean │ 2000 │ ' 370 ms' │ ' 5 ms' │ ' 74.00 x' │
│ Array_Number │ 2000 │ ' 733 ms' │ ' 9 ms' │ ' 81.44 x' │
│ Array_String │ 2000 │ ' 764 ms' │ ' 10 ms' │ ' 76.40 x' │
│ Array_Boolean │ 2000 │ ' 818 ms' │ ' 6 ms' │ ' 136.33 x' │
│ Array_ObjectA │ 2000 │ ' 3744 ms' │ ' 35 ms' │ ' 106.97 x' │
│ Array_ObjectB │ 2000 │ ' 3893 ms' │ ' 34 ms' │ ' 114.50 x' │
│ Array_Tuple │ 2000 │ ' 2229 ms' │ ' 16 ms' │ ' 139.31 x' │
│ Array_Union │ 2000 │ ' 1705 ms' │ ' 18 ms' │ ' 94.72 x' │
│ Array_Vector4 │ 2000 │ ' 2261 ms' │ ' 17 ms' │ ' 133.00 x' │
│ Array_Matrix4 │ 2000 │ ' 1574 ms' │ ' 14 ms' │ ' 112.43 x' │
└──────────────────┴────────────┴──────────────┴──────────────┴──────────────┘Validate
This benchmark measures validation performance for varying types. You can review this benchmark here.
┌──────────────────┬────────────┬──────────────┬──────────────┬──────────────┬──────────────┐
│ (index) │ Iterations │ ValueCheck │ Ajv │ TypeCompiler │ Performance │
├──────────────────┼────────────┼──────────────┼──────────────┼──────────────┼──────────────┤
│ Number │ 1000000 │ ' 37 ms' │ ' 5 ms' │ ' 5 ms' │ ' 1.00 x' │
│ String │ 1000000 │ ' 31 ms' │ ' 24 ms' │ ' 13 ms' │ ' 1.85 x' │
│ Boolean │ 1000000 │ ' 25 ms' │ ' 25 ms' │ ' 11 ms' │ ' 2.27 x' │
│ Null │ 1000000 │ ' 32 ms' │ ' 26 ms' │ ' 10 ms' │ ' 2.60 x' │
│ RegEx │ 1000000 │ ' 170 ms' │ ' 48 ms' │ ' 35 ms' │ ' 1.37 x' │
│ ObjectA │ 1000000 │ ' 564 ms' │ ' 36 ms' │ ' 23 ms' │ ' 1.57 x' │
│ ObjectB │ 1000000 │ ' 1000 ms' │ ' 56 ms' │ ' 40 ms' │ ' 1.40 x' │
│ Tuple │ 1000000 │ ' 125 ms' │ ' 27 ms' │ ' 13 ms' │ ' 2.08 x' │
│ Union │ 1000000 │ ' 316 ms' │ ' 27 ms' │ ' 14 ms' │ ' 1.93 x' │
│ Recursive │ 1000000 │ ' 3308 ms' │ ' 415 ms' │ ' 183 ms' │ ' 2.27 x' │
│ Vector4 │ 1000000 │ ' 135 ms' │ ' 27 ms' │ ' 12 ms' │ ' 2.25 x' │
│ Matrix4 │ 1000000 │ ' 658 ms' │ ' 44 ms' │ ' 30 ms' │ ' 1.47 x' │
│ Literal_String │ 1000000 │ ' 48 ms' │ ' 26 ms' │ ' 10 ms' │ ' 2.60 x' │
│ Literal_Number │ 1000000 │ ' 49 ms' │ ' 31 ms' │ ' 9 ms' │ ' 3.44 x' │
│ Literal_Boolean │ 1000000 │ ' 47 ms' │ ' 28 ms' │ ' 10 ms' │ ' 2.80 x' │
│ Array_Number │ 1000000 │ ' 418 ms' │ ' 38 ms' │ ' 17 ms' │ ' 2.24 x' │
│ Array_String │ 1000000 │ ' 466 ms' │ ' 35 ms' │ ' 22 ms' │ ' 1.59 x' │
│ Array_Boolean │ 1000000 │ ' 403 ms' │ ' 41 ms' │ ' 24 ms' │ ' 1.71 x' │
│ Array_ObjectA │ 1000000 │ ' 13596 ms' │ ' 2861 ms' │ ' 1759 ms' │ ' 1.63 x' │
│ Array_ObjectB │ 1000000 │ ' 15767 ms' │ ' 2798 ms' │ ' 1991 ms' │ ' 1.41 x' │
│ Array_Tuple │ 1000000 │ ' 1666 ms' │ ' 103 ms' │ ' 73 ms' │ ' 1.41 x' │
│ Array_Union │ 1000000 │ ' 4738 ms' │ ' 229 ms' │ ' 87 ms' │ ' 2.63 x' │
│ Array_Recursive │ 1000000 │ ' 56371 ms' │ ' 7315 ms' │ ' 2813 ms' │ ' 2.60 x' │
│ Array_Vector4 │ 1000000 │ ' 2180 ms' │ ' 106 ms' │ ' 53 ms' │ ' 2.00 x' │
│ Array_Matrix4 │ 1000000 │ ' 11795 ms' │ ' 384 ms' │ ' 313 ms' │ ' 1.23 x' │
└──────────────────┴────────────┴──────────────┴──────────────┴──────────────┴──────────────┘Compression
The following table lists esbuild compiled and minified sizes for each TypeBox module.
┌──────────────────────┬────────────┬────────────┬─────────────┐
│ (index) │ Compiled │ Minified │ Compression │
├──────────────────────┼────────────┼────────────┼─────────────┤
│ typebox/compiler │ ' 49 kb' │ ' 24 kb' │ '2.00 x' │
│ typebox/conditional │ ' 42 kb' │ ' 17 kb' │ '2.46 x' │
│ typebox/format │ ' 0 kb' │ ' 0 kb' │ '2.66 x' │
│ typebox/guard │ ' 21 kb' │ ' 10 kb' │ '2.07 x' │
│ typebox/value │ ' 72 kb' │ ' 33 kb' │ '2.16 x' │
│ typebox │ ' 11 kb' │ ' 6 kb' │ '1.91 x' │
└──────────────────────┴────────────┴────────────┴─────────────┘Contribute
TypeBox is open to community contribution. Please ensure you submit an open issue before submitting your pull request. The TypeBox project preferences open community discussion prior to accepting new features.