JSON to TypeScript — generate a TypeScript interface online

Have a JSON response, config file, or API payload and want a proper TypeScript type for it instead of typing any? Generate a real interface in one click, entirely in your browser.

Json Web Viewer's Types mode reads your document's actual shape — property names, nesting, array element types, whether a value is ever null — and generates a matching TypeScript interface, ready to paste into your codebase. No server round-trip, no account, no upload.

The same engine also generates Go structs, Rust structs, Python dataclasses, Java records, C# records, and Kotlin data classes from the exact same document — switch languages from the dropdown next to the mode buttons rather than re-pasting your JSON into a different tool for each target language.

Example — this JSON:

{
  "id": "ord_9f21a",
  "customer": {
    "name": "Ada Lovelace",
    "email": "ada@example.com",
    "vip": true
  },
  "items": [
    { "sku": "book-001", "qty": 2, "price": 19.99 },
    { "sku": "mug-014", "qty": 1, "price": 12.5 }
  ],
  "shippedAt": null
}

generates this TypeScript:

interface Root {
  id: string;
  customer: Customer;
  items: Item[];
  shippedAt: null;
}

interface Customer {
  name: string;
  email: string;
  vip: boolean;
}

interface Item {
  sku: string;
  qty: number;
  price: number;
}

Open this example in the editor →
The link above pre-loads the order example above into Types mode. TypeScript is the default — select Go or Rust from the language dropdown to regenerate the same document in either of those instead.

Need to check your JSON's shape against a formal schema instead of a language type? See JSON Schema Generator.