JSON to TypeScript Converter – Paste JSON, Get Interfaces
If you work with APIs or config files, you’ve probably found yourself writing TypeScript interfaces by hand to match JSON structures. It’s not hard, but it’s repetitive. So I built JSON to TypeScript Converter to do it automatically.
You paste in some JSON, and it gives you clean, typed interfaces. That’s it. No setup, no login, no tracking.
It handles nested objects, arrays, optional fields (based on null values), and basic type inference. It also lets you choose between type and interface, and whether to use number, string, or more specific literals when appropriate.
The tool runs entirely in your browser — your data never hits a server. That means your API responses or config objects stay local, which is how it should be.
There’s a free tier that covers most use cases. You can convert JSON, preview the output, and copy the result. No limits on size or usage.
If you use it regularly, there’s a Pro tier for $9/month that adds:
- Named models (so you can organize interfaces with custom names)
- Export as
.tsfile - Dark mode (because staring at white UI all day is rough)
- Priority processing (faster parsing for large or complex JSON)
It’s not trying to replace manual typing for complex schemas — sometimes you need unions, generics, or custom logic. But for 80% of the time, this speeds things up.
I use it daily when integrating third-party APIs or mocking data in frontend projects. It’s simple, fast, and stays out of your way.
Check it out:
👉 https://tool-json-to-typescript-converter.vercel.app
Feedback? Issues? There’s a GitHub link on the site. Pull requests welcome.
No ads. No analytics. Just a small tool that does one thing.
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