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JSON to TypeScript Converter

Paste JSON, get a TypeScript interface — field types inferred automatically, nested objects included.

How to use this tool

  1. 1Paste or type your input above.
  2. 2The result updates instantly.
  3. 3Copy the output with one click.

Frequently asked questions

How are types inferred?+

From the values: strings, numbers, booleans, null, arrays (typed by their first element) and nested objects become inline interfaces. Review optional fields manually — JSON can't express them.

Is my data private?+

Yes. The tool runs entirely in your browser — nothing you paste or type is uploaded to a server.

Learn more

  • JSON to TypeScript Converter: how it works
  • json to typescript tips
  • JSON to TypeScript Converter FAQs