What is JSON to TypeBox Schema Generator?

TypeBox is a JSON Schema Type Builder with Static Type Resolution for TypeScript. It creates JSON Schema specifications that are also valid TypeScript types, giving you both runtime validation (via JSON Schema validators like Ajv) and compile-time type safety. This tool generates TypeBox schemas from JSON samples automatically.

How to Use

Paste your JSON into the left panel.
Click "Generate" to produce the TypeBox schema.
Copy the output and paste it into your TypeScript project.
Install TypeBox: npm install @sinclair/typebox
Use with Ajv or any JSON Schema validator for runtime validation.

Why Use This Tool?

Generates Type.String, Type.Number, Type.Integer, Type.Boolean from JSON

Detects integers automatically and uses Type.Integer()

Handles nested objects and arrays recursively

Includes TypeScript type extraction via Static<T>

Output is valid JSON Schema for use with any validator

Tips & Best Practices

TypeBox schemas are valid JSON Schema — use with Ajv, fast-json-stringify, etc.
For optional properties, wrap with Type.Optional(): Type.Optional(Type.String())
Add constraints: Type.String({ minLength: 1, maxLength: 100 })
Use Type.Record() for dictionary-like objects with dynamic keys
Combine with Type.Intersect() or Type.Union() for complex schemas

Frequently Asked Questions

What is the difference between TypeBox and Zod?

TypeBox generates JSON Schema specifications that are also TypeScript types. This means you can use any JSON Schema validator (Ajv, fast-json-stringify) for runtime validation. Zod is a standalone validation library with its own API. Use TypeBox when you need JSON Schema compatibility or want to use JSON Schema-based tools.

How do I validate data with TypeBox?

TypeBox creates JSON Schema, so use any JSON Schema validator. With Ajv: import Ajv from "ajv"; const ajv = new Ajv(); const validate = ajv.compile(Schema); const isValid = validate(data). If isValid is true, data conforms to the schema. Errors are in validate.errors.

Why does TypeBox generate JSON Schema?

JSON Schema is a standard format understood by many tools: validators (Ajv), mock generators, documentation generators, and IDEs. By generating JSON Schema, TypeBox schemas work with this entire ecosystem while still providing TypeScript type safety via the Static<T> type helper.

JSON to TypeBox Schema Generator