JSON to TypeScript Interface

Paste JSON and instantly generate TypeScript interfaces with inferred types.

JSON input:

Root interface name:

Add export keyword

Output:

Interfaces appear here…

How to use

Paste JSON, set the root interface name, and click Convert. Copy the generated interfaces. Everything runs in your browser.

How are types inferred?

Strings, numbers, booleans, nulls, arrays and nested objects are mapped automatically; nested objects become their own interfaces.

Does it handle arrays?

Yes — empty arrays become unknown[] and arrays of objects reuse the item interface.

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