JSON to TypeScript Converter – Paste JSON, Get Interfaces

If you work with APIs or JSON data regularly, you’ve probably written TypeScript interfaces by hand more times than you’d like. I built JSON to TypeScript Converter to cut out the repetitive part.

The tool does one thing: you paste JSON, and it generates clean TypeScript interfaces. That’s it. No account needed. No data stored. It runs entirely in your browser — your JSON never touches a server.

It handles nested objects, arrays, optional fields (based on null values), and basic type inference. You’ll still want to review and tweak the output — especially if your API returns inconsistent shapes — but it’s a solid starting point.

There’s a free tier that covers most use cases.…