JSON to TypeScript converter
Generate a TypeScript interface from a JSON object, including nested types.
🔒 100% client-side — no data sent
JSON to TypeScript converter that automatically generates interfaces (or types) from any JSON object. Save time and avoid typing errors with precise, nested types produced instantly. Conversion runs entirely in your browser: your JSON is never sent to a server.
FAQ
How do I turn JSON into a TypeScript interface?
Paste your JSON object and the tool infers the type of each property to produce a full interface. It also handles nested objects and arrays.
Does the tool handle nested objects and arrays?
Yes, nested structures generate separate interfaces or nested types depending on depth. Each level gets an appropriate type.
What's the difference between interface and type in TypeScript?
Interfaces are well suited to extensible object shapes, while type aliases also handle unions and primitives. For typing a JSON response, either works fine.
How are null or empty values typed?
A lone null value is hard to infer and is often typed as any or null; provide a representative sample for better results. A complete JSON yields more reliable types.