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. Just a straightforward converter that runs in your browser.
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 includes interface definitions with proper typing for strings, numbers, booleans, nulls, and arrays. You can tweak naming and export settings, then copy the result straight into your project.
There’s a free tier that covers most use cases — paste, convert, done. If you need more, the Pro version ($9/month) adds:
- Support for multiple JSON samples (to merge and infer more accurate types)
- Custom type naming (instead of auto-generated names like
UserorData) - Optional field detection with thresholds (e.g., if a field is null in 30% of cases, mark it optional)
- No rate limits
I use this tool daily when integrating with third-party APIs. It doesn’t replace manual refinement, but it removes the boilerplate. You still review and adjust — especially for edge cases or domain-specific types — but you’re starting from something useful instead of blank lines.
It’s built with simplicity in mind. No tracking. No login. Open in a tab, paste your JSON, grab the output.
Try it if you’re tired of writing the same interfaces over and over.
https://tool-json-to-typescript-converter.vercel.app
Feedback? Issues? GitHub repo is public — feel free to open an issue or suggest improvements.
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