Paste JSON and get clean TypeScript interfaces or type aliases, generated on your device. Supports optional-property detection, literal unions, readonly props, and full naming control.
Your JSON never leaves your browser. Nothing is uploaded.
JSON to TypeScript is a free, private text and code tool that runs entirely in your web browser. Paste any JSON object and get clean TypeScript interfaces or type aliases in seconds. Because everything happens locally on your device, your files and data are never uploaded to a server, there is no sign-up or installation required, and it keeps working offline. Like every free online tool by Digital Heroes, JSON to TypeScript is 100% free with no limits.
Yes. JSON to TypeScript is completely free for everyone. No sign-up, no account and no usage limits.
No. JSON to TypeScript runs entirely in your browser on your own device, so your data never leaves your computer and nothing is uploaded to a server.
Yes. This tool is a Progressive Web App. Once the page has loaded it keeps working offline, and you can install it as an app from your browser.
No. Just open the page and start using it. Installing it as an app is optional and only adds offline convenience.
It converts any valid JSON into TypeScript interfaces or type aliases instantly, with options for optional props, literal unions, readonly, and naming style.