JSON to TypeScript Interfaces
Generate clean TypeScript interfaces from any JSON sample.
Runs 100% in your browser — nothing is ever uploaded.
What is JSON → TS?
Paste JSON, get TypeScript interfaces instantly. Nested objects, arrays and optional fields handled. 100% client-side and free. Paste your content, get an instant result, and copy or download the output with a single click. It's completely free, works in any modern browser and requires no sign-up — everything runs locally on your device, so your data never leaves your computer.
How to use JSON → TS
- Open JSON → TS — it loads instantly and needs no sign-up.
- Paste or type your input into the editor (or press Sample to try an example).
- Adjust the available options if needed and press the action button.
- Copy the result with one click or download it as a file.
Frequently asked questions
Is JSON → TS really free?
Yes — JSON → TS is 100% free with no limits, no watermarks and no registration. You can use it as often as you like, on as many files or inputs as you need.
Is my data safe when I use JSON → TS?
Absolutely. JSON → TS runs entirely in your browser using JavaScript — your input is processed on your own device and is never uploaded to any server.
Does JSON → TS work on mobile devices?
Yes. JSON → TS works in any modern browser on desktop, tablet and mobile (Chrome, Firefox, Safari, Edge) — there is no app to install.
Is my code uploaded to a server?
Never. Every CodeKit tool runs entirely in your browser with JavaScript. Your code is processed on your device and never touches a network — it even works offline once the page is loaded.
Are these tools really free?
Yes — 100% free, no sign-up, no limits, no watermarks. We keep the site running with minimal, non-intrusive ads.
Is there a file or size limit?
No hard limit. Because processing happens on your machine, the only constraint is your device’s memory. Files of several megabytes work fine.