JSON to TypeScript Interface Generator

It analyzes your JSON data structure and automatically generates TypeScript interface definitions with correct types for all properties, including nested objects and arrays.

Yes. Null values are typed as 'type | null', and fields that may be missing are typed as optional (?) properties.

Yes, you can toggle between 'interface' and 'type' output to match your project's TypeScript style guide.

All processing is done entirely in your browser. No data is sent to any server.

Yes, completely free with no registration needed.