JSON to TypeScript Converter – Paste JSON, Get Interfaces
I built a small tool that saves me time almost every day: 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. It’s not trying to do everything, but it covers the 90% use case fast.
I made it because the existing tools either had too many steps, required sign-ins, or generated overly complex output. This one runs entirely in the browser—your data never hits a server. Just paste, copy, done.
There’s a free tier that lets you convert up to 500 lines of JSON at a time. That’s enough for most API responses or config files. If you need more—larger payloads, multiple interfaces with better nesting, or enum suggestions—there’s a Pro tier for $9/month. It also removes the small footer ad and adds dark mode (which I use constantly).
No tracking. No cookies beyond what’s needed for auth (if you upgrade). Open-source core logic, so you can see how the inference works.
Try it here:
👉 https://tool-json-to-typescript-converter.vercel.app
It’s helped me stop writing boilerplate by hand, especially when working with third-party APIs or mocking backend responses. I use it daily, tweak it based on my own pain points, and welcome feedback or issues on the repo (linked on the site).
If you’re tired of manually translating JSON responses into interfaces, give it a shot. Might save you a few minutes each time—and those add up.
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