Convert JSON to a TypeScript Interface Automatically

Hand-writing TypeScript interfaces for every API response is tedious and error-prone. If you have a sample JSON response, you can generate the types automatically. Here's how to convert JSON to a TypeScript interface in seconds.

Generate interfaces from JSON

Paste a JSON object (or an array of objects) into the JSON to TypeScript tool, give the root interface a name, and get matching interfaces — including nested types for objects and arrays. Copy them straight into your codebase.

Why generate instead of hand-type?

Generated types match the real shape of your data exactly, catch typos you'd make by hand, and take a fraction of the time. When the API changes, paste a fresh sample and regenerate — no manual diffing.

Handling nested objects and arrays

Nested objects become their own interfaces, and arrays are typed by their first element (e.g. tags: string[]). Review array types if your data is heterogeneous, and mark optional fields yourself where the API can omit them.

Get the JSON first

Only have a spreadsheet? Turn it into JSON with Excel to JSON or CSV to JSON, then generate the interface. Validate the sample with the JSON validator so the types come out clean.

Related

Convert the same JSON to YAML or XML, or format it with the JSON formatter.