Is the generated type production-ready?
Treat it as a draft. Review optional fields, union types, dates, and arrays that may contain varied structures.
Developer tools
Generate TypeScript interfaces from JSON.
Paste example JSON to infer nested object and array shapes, then copy a practical TypeScript interface draft into your project.
Type draft browser local
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One input
Local onlyPaste JSON to infer types
Paste JSON and run this focused tool entirely in your browser.
How it works
Made for one clear task.
This generator infers a TypeScript shape from one valid JSON sample. It is a fast starting point for root interfaces, nested objects, and array values, but real API contracts still need review for optional fields, union types, date strings, nullability, and varied array shapes.
- Creates an exported root interface
- Infers nested object and array shapes
- Uses unknown[] for empty arrays
Common questions
Generate TypeScript interfaces from JSON. FAQs
Does it send my API response anywhere?
No. Type inference runs locally in the browser.