JSON till TypeScript Interface Generator

What this tool does

Typed interfaces from real data

Paste a JSON response from any API and this tool infers the TypeScript interface structure automatically. Nested objects become separate named interfaces, arrays are typed as element arrays, and null values are flagged as optional fields.

When it's most useful

Particularly helpful when consuming third-party APIs that don't ship TypeScript types. Paste the sample response from the docs and immediately get a usable interface to drop into your project.