How are nested objects and arrays handled?

Nested objects generate their own named interface, and arrays generate a union of the element types found, so mixed-type arrays are represented accurately.

Will the field names always match?

Yes — field names are preserved exactly, with quoting added automatically for any key that isn't a valid identifier.

JSON to TypeScript Converter

Generate a TypeScript interface from a JSON object.

{ "id": 1, "name": "Ada Lovelace", "active": true, "tags": ["admin", "user"] }

Your file never leaves this browser tab — everything runs locally on your device.

How to use json to typescript converter

Paste a JSON object (or array of objects).
Click "Generate TypeScript".
Copy the generated interfaces into your project.

Common use cases

Quickly typing an API response instead of writing interfaces by hand.
Bootstrapping types for a JSON config or fixture file.
Checking what shape TypeScript would infer from a piece of sample data.

Related tools

JSON Diff Checker

Compare two JSON documents side by side and see exactly what changed.

QR Code Generator

Create a downloadable QR code from any text or URL.

JWT Decoder

Decode a JWT's header and payload. Decoding is not signature verification.

UUID Generator

Generate one or many random UUID v4 values.