JSON to TypeScript
Paste any JSON object or array and generate matching TypeScript interfaces. Nested objects are extracted into separate named interfaces; mixed-type arrays produce a union. Useful for typing API responses without hand-writing the boilerplate. Runs entirely in your browser.
Privacy
Runs entirely in your browser — nothing is sent to any server.
Cost
Free. No sign-up, no watermark.
Type
Generator
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Frequently asked
Is JSON to TypeScript free to use?
Yes. JSON to TypeScript is completely free with no sign-up, no watermark, and no usage limits. Toolsly does not charge for any of its tools.
Do my files and data stay private?
Yes — JSON to TypeScript runs entirely in your browser using your device's CPU. Files and text are never uploaded to our servers, so your data stays private.
How does JSON to TypeScript work?
Open JSON to TypeScript, paste or fill in the input fields, and the result updates instantly. Everything runs in your browser — no upload, no waiting.
Which browsers does JSON to TypeScript support?
Any modern browser works — Chrome, Firefox, Safari, and Edge on desktop and mobile. JSON to TypeScript uses standard web APIs and does not require any plugin, extension, or sign-up.