typebox

Development

TypeBox patterns for runtime schema validation and JSON Schema generation. Use when mentioning TypeBox, Standard Schema, or schema-based validation.

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TypeBox

Package Names

Use typebox, not @sinclair/typebox. The @sinclair/typebox package is deprecated.

// Correct
import { Type } from 'typebox';
import { Compile } from 'typebox/compile';
import { Value } from 'typebox/value';

// Wrong - deprecated
import { Type } from '@sinclair/typebox';

When to Use What

Need	Use
Define schemas	`typebox` with `Type.*`
One-off validation	`Value.Check()` from `typebox/value`
High-performance validation	`Compile()` from `typebox/compile`

TypeBox schemas are portable JSON Schema-shaped data. If a TypeBox boundary needs validation, validate the TypeBox schema directly:

import { Type } from 'typebox';
import { Compile } from 'typebox/compile';
import { Value } from 'typebox/value';

const schema = Type.Object({ name: Type.String(), age: Type.Number() });

Value.Check(schema, value); // boolean

const validator = Compile(schema);
validator.Check(value); // boolean
validator.Parse(value); // throws or returns typed value

Standard Schema Boundary

TypeBox does not implement Standard Schema. Do not write TypeBox code that expects schema['~standard']. If a boundary accepts Standard Schema, prefer Arktype or another schema library that implements it natively. If a boundary owns TypeBox schemas, keep the boundary TypeBox-native and use JSON Schema as the portable representation.

Repo Policy

Use TypeBox for portable schema objects: workspace tables, kv, fields, actions, MCP inputs, manifests, and other surfaces that need JSON Schema shape, metadata, Static<>, or schema inspection. Use Arktype for local runtime validation, request parsing, env/config parsing, persisted UI state, transforms, and branded domain values.