JSON to TS
Convert JSON to Interfaces.
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How to Use the JSON to TS Converter
Paste your valid JSON response or payload directly into the input text area.
Specify a custom name for the Root Interface, select the declaration style (Interface or Type), and toggle optional properties if needed.
Click "Convert to TypeScript" to instantly generate properly typed, nested TS interfaces ready to copy into your codebase.
Features & Benefits
100% Privacy Preserved
All JSON parsing and type inference occurs entirely within your browser. Your sensitive JSON payloads and API responses are never uploaded to remote servers.
Nested Object Support
Complex, deeply nested JSON objects are automatically flattened into cleanly separated and named TypeScript interfaces for superior code readability.
Smart Type Inference
The converter intelligent maps JSON types directly to their TS counterparts (strings, numbers, booleans, any, and specific arrays).
Customizable Output
Export your TypeScript definitions as standard interfaces or strict type aliases. You can also force all properties to be optional with a single click.
Frequently Asked Questions
Why should I convert JSON to TypeScript?
TypeScript provides static typing for JavaScript. Converting API JSON responses into TypeScript interfaces ensures you get proper autocompletion, type-checking, and error prevention in your IDE during development.
How does it handle JSON arrays?
If your root JSON or any property contains an array of objects, the tool will automatically create a dedicated interface for a single item in that array, and then assign the parent property as an array of that new type (e.g., ItemType[]).
Is my API data uploaded anywhere?
No. The JSON parsing and recursive string generation process happens entirely locally on your device via JavaScript. Zero data is transmitted over the internet.
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