Free JSON Schema to TypeScript Converter
Convert JSON Schema documents into TypeScript interface and type definitions. Supports nested objects, enums, $ref, anyOf, allOf, and more.
data_object JSON Schema Input
code TypeScript Output
Schema: 0 lines
Output: 0 lines
Key Features
Full Schema Coverage
Handles objects, arrays, enums, nested schemas, $ref, anyOf, allOf, oneOf, and additional properties.
Clean TypeScript Output
Generates proper TypeScript interfaces with optional fields, JSDoc comments, and type aliases for non-object types.
Instant Results
All conversion runs locally in your browser for instant, zero-latency results with no server roundtrips.
Privacy Protected
Your data never leaves your browser. No server storage or tracking. Complete privacy guaranteed.
Frequently Asked Questions
Basics
What is JSON Schema?
JSON Schema is a declarative language that allows you to annotate and validate JSON documents. It describes the structure, data types, and constraints of JSON data, making it possible to automatically validate whether a JSON document conforms to the expected format.
How does JSON Schema differ from JSON data?
JSON data is actual content (like a user record), while JSON Schema is a specification that describes what valid JSON data should look like. This tool converts the schema (the specification) into TypeScript type definitions, not data into TypeScript.
What TypeScript features are generated?
The tool generates TypeScript interfaces for object types, type aliases for primitives and unions, JSDoc comments from descriptions, optional fields based on the required array, discriminated unions from anyOf/oneOf, and intersection types from allOf. Nested objects become separate interfaces with auto-generated names.
Usage
How do I use this tool?
Paste your JSON Schema document into the input panel on the left, then click "Generate Types" to convert it to TypeScript interface definitions. Use "Load Sample" to try a comprehensive example, and click the copy icon or "Copy Output" to copy the generated TypeScript to your clipboard.
How does this differ from JSON to TypeScript tools?
JSON to TypeScript tools generate types from example JSON data (inferring structure). This tool generates TypeScript from JSON Schema, which is a formal specification. Schema-based generation is more precise because schemas explicitly declare types, constraints, optional fields, enums, references, and union types that cannot be inferred from example data alone.
What if my schema is invalid JSON?
The tool will display an error message indicating the JSON parse error. Please check your JSON syntax and try again. Common issues include trailing commas, unquoted keys, and mismatched brackets.