JSON to TypeScript
Paste a JSON sample and get typed interfaces you can drop straight into your codebase. Nested objects become their own interfaces; arrays are inferred from their elements. Runs entirely client-side.
JSON to TypeScript
Convert any JSON object into clean TypeScript interfaces instantly, in your browser.
// Interfaces appear here…
Frequently asked questions
How are nested objects handled?
Each nested object becomes its own named interface, referenced from the parent, so the output stays readable instead of collapsing into one giant inline type. Arrays are typed by inferring the element type from their contents.
Can it mark optional or nullable fields?
Yes. Enable the option and fields whose value is null are emitted as optional (name?: type) or as a union with null, so the generated types match data where keys may be missing.
Does my JSON get uploaded?
No. The conversion runs locally in your browser, so you can safely turn real API responses into TypeScript types without sharing them.