JSON to TypeScript Converter – Paste JSON, Get Interfaces

I built a small tool to save time when working with APIs: JSON to TypeScript Converter .

You paste JSON, and it gives you clean TypeScript interfaces—nothing more, nothing less. It handles nested objects, arrays, optional fields (based on null values), and basic type inference (string, number, boolean, null, arrays, objects). You can tweak naming (PascalCase, camelCase), choose export types, and toggle whether to mark null fields as optional.

It’s just a parser with a minimal UI—no accounts, no tracking, no signup. The whole thing runs in the browser. Your data never hits a server.

There’s a free tier that works fine for one-off conversions.…