JSON to TypeScript Converter – Paste JSON, Get Interfaces
If you work with APIs or config files, you’ve probably found yourself manually writing TypeScript interfaces to match JSON structures. I built JSON to TypeScript Converter to cut out that repetitive work.
The tool does one thing: you paste in JSON, and it generates clean, readable TypeScript interfaces. That’s it. No account needed. No data stored. It runs entirely in your browser — your JSON never touches a server.
You can use it here:
👉 https://tool-json-to-typescript-converter.vercel.app
It handles nested objects, arrays, optional fields (based on null values), and basic type inference. The output is formatted and ready to drop into your codebase. You can also adjust naming (PascalCase, camelCase, etc.) and choose whether to generate type or interface syntax.
There’s a free tier that covers most use cases. For heavier usage, the Pro version ($9/month) adds:
- Support for multiple interfaces from one JSON (e.g., when you have several root-level objects)
- Union types for inconsistent values (e.g., a field that’s sometimes string, sometimes null)
- Optional property detection with custom thresholds
- No rate limits
I use this daily in my own projects — especially when integrating third-party APIs or mocking responses. It’s not perfect (edge cases exist, as with any auto-conversion), but it gets you 90% of the way there without the boilerplate.
Feedback welcome. If you spot a bug or have a feature idea, there’s a link on the site to report it directly.
No tracking. No analytics. Just a small tool that saves a few minutes here and there — which, over time, adds up.
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