JSON to TypeScript Interface Generator
Paste JSON and instantly generate TypeScript interfaces or type definitions. Handles nested objects, arrays, optional fields, and union types.
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Smart PicksHow to use JSON to TypeScript Interface Generator
JSON to TypeScript Interface Generator saves hours of manual type writing. Paste any JSON and get production-ready TypeScript definitions instantly.
- 1Paste your JSON data into the input panel.
- 2The TypeScript interface is generated in real-time.
- 3Set the root interface name (default: Root) in the options.
- 4Toggle between 'interface' and 'type' output styles.
- 5Click Copy to use the definition in your TypeScript project.
Common Use Cases
- Typing API response objects from REST or GraphQL endpoints
- Creating TypeScript types from JSON config file structures
- Generating interfaces from database query result JSON
- Quickly prototyping types during development without manual writing
Pro Tips
- Use an API response sample to generate accurate types โ real data is better than mock data.
- Add 'as const' to JSON objects before converting for literal type inference.
- Nested objects become nested interfaces automatically โ check for reusable sub-interfaces.
- Union types (string | number) are generated when JSON arrays contain mixed types.
Frequently Asked Questions
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.
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