JSON to TypeScript

Free online JSON to TypeScript converter to generate TypeScript interfaces instantly in your browser.

  • Runs locally in your browser
  • No data uploaded
  • Instant processing
Waiting for input

How to Use JSON to TypeScript

  1. Paste or type a valid JSON object into the input panel.
  2. TypeScript interfaces are generated instantly in the output panel.
  3. Click Copy to copy the generated interfaces to your clipboard.

Example Usage

Input

{
  "name": "Alice",
  "age": 30,
  "address": {
    "city": "NYC"
  }
}

Output

interface RootAddress {
  city: string;
}

interface Root {
  name: string;
  age: number;
  address: RootAddress;
}

Frequently Asked Questions

Does this tool send my JSON to a server?
No. All processing happens entirely in your browser. Your data never leaves your device.
Can it handle nested objects and arrays?
Yes. The converter recursively generates interfaces for nested objects and infers array item types.
What happens if my JSON is invalid?
You will see a clear error comment in the output panel. Fix the JSON and the output updates instantly.