JSON to TypeScript

Each key in your JSON becomes a field in the generated interface, typed as string, number, boolean, or an array/object type. Nested objects generate their own named interface automatically.

It reads the shape of the first object in the array to generate the type, then types the field as that interface followed by [] — e.g. tags: Tag[].

This tool infers the type from the first value it sees for each field, so fields with genuinely mixed types across records may need manual adjustment into a union type after generating.

Yes — paste any JSON response body and you'll get interfaces ready to drop into your codebase, which is faster than hand-writing types for a large or deeply nested payload.

No. The interface generation runs entirely in your browser — nothing is sent to a server.