JSON to TypeScript Converter – Paste JSON, Get Interfaces
If you work with APIs or config files, you’ve probably spent time manually writing TypeScript interfaces to match JSON structures. I built JSON to TypeScript Converter to cut that down to seconds.
The tool does one thing: you paste JSON, and it generates clean, readable TypeScript interfaces. That’s it. No account needed. No data stored. It runs entirely in your browser — your data never touches a server.
You can try 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. You’ll get interfaces with proper naming, optional properties where needed, and even comments showing original value examples.
There’s a free tier that covers most use cases. You can convert small to medium JSON payloads, rename the root interface, and toggle options like “optional on null” or “camelCase conversion.”
If you use it regularly, there’s a $9/month Pro tier that adds:
- Support for large or complex JSON (deep nesting, big arrays)
- Multiple interface outputs with import/export toggles
- Ability to save and organize templates (useful for recurring API responses)
- No waiting between conversions
I use this daily at work when integrating third-party APIs or prototyping new features. It’s not perfect — no auto-converter is — but it gets you 90% of the way. I still review and tweak the output, but it saves me time every single time.
No tracking. No ads. Open-source components where possible. Built with Svelte and TypeScript (naturally).
If you find a bug or want to suggest a feature, there’s a feedback form on the site. I read every submission.
Give it a try next time you’re staring at a JSON response and dreading the interface grind.
https://tool-json-to-typescript-converter.vercel.app
Top comments (0)