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JSON to TypeScript Converter Online

Convert JSON to TypeScript interfaces and type definitions directly in your browser. Handle nested objects, arrays, API response data, and custom interface names with a clear preview.

100% FreeNo Signup RequiredPrivacy Friendly
Privacy note: supported browser-first tools process ordinary inputs locally. Do not enter passwords, private keys, payment data or other confidential information into any online tool.

📁 Drag & drop a .json file here, or click to browse

JSON is processed in your browser. Maximum file size: 10 MB.

JSON Input
0 characters
TypeScript Output
0 characters
Use a valid TypeScript identifier such as User, Product, ApiResponse, or RootObject.

JSON to TypeScript Converter Online

Use this free JSON to TypeScript converter to turn valid JSON into readable TypeScript interfaces or type definitions. It is useful when working with API responses, configuration data, mock JSON, frontend models, and backend payloads. The generated code is designed to give you a practical starting point that you can review and adapt to your project.

If you need to convert JSON to TypeScript for an API response, create a TypeScript interface from a JSON object, or quickly generate types from nested JSON, paste the data above and choose a clear root name. The tool runs in your browser and provides both copy and .ts download options.

How to Convert JSON to TypeScript

  1. Paste valid JSON into the input box or upload a .json file.
  2. Enter a root interface name such as User, Product, or ApiResponse.
  3. Click Generate TypeScript to create interfaces or type definitions.
  4. Review the generated structure, then copy the code or download the .ts file.

What This JSON to TS Converter Handles

  • Nested JSON objects and deeply nested structures.
  • Arrays of objects and arrays of primitive values.
  • Strings, numbers, booleans, null values, and mixed arrays.
  • JSON objects with keys that need safe TypeScript property syntax.
  • JSON API response structures and reusable TypeScript model definitions.
  • Custom root names and browser-based copy/download workflows.

Why Use a JSON to TypeScript Generator?

Writing interfaces by hand can take time when a JSON response contains many fields or nested objects. A JSON to TS generator can quickly show the structure, making it easier to create a first-pass model for frontend applications, Node.js projects, API clients, and other TypeScript codebases. Always review generated types against your real API contract before using them in production.

Example: A JSON object containing id, name, active, an address object, and a tags array can be converted into a root interface plus nested TypeScript definitions.

Frequently Asked Questions

What does a JSON to TypeScript converter do?
It reads valid JSON and creates TypeScript interfaces or type definitions that match the detected data structure.
Can I convert nested JSON and arrays?
Yes. Nested objects, arrays, primitive values, null values, and mixed structures are handled by the converter.
Can I convert JSON API responses to TypeScript?
Yes. Paste a valid API response body or upload a JSON file to generate a starting TypeScript model.
Is this JSON to TS tool free?
Yes. The converter is available as a free browser-based utility with no mandatory account.
Is my JSON uploaded to a server?
This converter processes the JSON in your browser. For safety, never enter passwords, private keys, payment data, or other confidential information into an online tool.