JSON to TypeScript Converter
JSON → TS Interfaces
Convert JSON object payloads into strongly typed TypeScript interface and type definitions.
About this tool
About JSON to TypeScript Converter
Hand-writing interfaces for an API response is slow and wrong in the places that matter: nullable fields, arrays whose first element happens to be a number while the rest are objects, keys with dashes that are not valid identifiers. Paste the payload and the types are inferred from the shape — nested objects become their own interfaces, arrays of objects are named from the plural and singular, mixed primitives become a union, and keys that are not valid identifiers come out quoted. The conversion is local, which is the point if the response contains user data you cannot ship to a third-party generator.
How to use JSON to TypeScript Converter
1
Paste JSON
Input sample JSON object.
2
Copy Interfaces
Copy TypeScript type definitions.
Key features
100% Private
JSON to TypeScript Converter processes your data locally in the browser. Nothing is uploaded, tracked, or stored — your files never leave your device.
Completely Free
Use JSON to TypeScript Converter as much as you want with no fees, no watermarks, and no hidden limits.
No Installation
JSON to TypeScript Converter runs in any modern browser. There's nothing to download, install, or configure.
Works Everywhere
Use JSON to TypeScript Converter on desktop, tablet, or mobile — all you need is a browser.
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