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JSON to TypeScript Interfaces — Free & Private (In-Browser)

Generate TypeScript interfaces from JSON in your browser. Infers nested types, arrays, and unions. No upload, no signup. Free.

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How to use JSON to TypeScript

  1. 1Paste a JSON object or array into the input box.
  2. 2The tool infers nested interfaces, arrays, and unions automatically.
  3. 3TypeScript interfaces appear in the output, generated in your browser.
  4. 4Copy the generated .ts types into your project.

JSON to TypeScript FAQ

Does it infer nested and optional types?
Yes. Nested objects become their own interfaces, and arrays of mixed primitives become unions — all generated locally in your browser.