JSON to TypeScript Converter
Paste JSON and generate TypeScript interfaces instantly in your browser. The tool infers nested objects, arrays, optional properties, and mixed shapes, then returns reusable exported types you can copy into your codebase.
Generate exportable TypeScript interfaces from sample JSON. Nested objects and arrays are converted into reusable types.
Input JSON
{
"id": 1,
"name": "Ada",
"tags": ["admin"],
"profile": {
"active": true
}
}
TypeScript Output
Paste JSON on the left, then run the conversion to generate the transformed output.
Frequently Asked Questions
Does this tool generate nested interfaces too?
Yes. Nested objects and array items are extracted into reusable exported interfaces when the sample JSON contains object structures.
Can it handle arrays with different item shapes?
Yes. The generated TypeScript output will use unions and optional properties when array items are not all shaped the same way.
Is my JSON uploaded anywhere?
No. Type generation happens entirely in your browser, so the sample data stays on your device.