Skip to content
Your data never leaves your browser

JSON to TypeScript

Convert JSON data into TypeScript interfaces or type aliases. Handles nested objects, arrays, optional fields, and mixed types. All processing happens in your browser.

What is JSON to TypeScript?

JSON to TypeScript automatically generates TypeScript interfaces or type aliases from JSON data, handling nested objects, arrays, optional fields, and mixed types. Instead of manually writing type definitions for API responses, paste the JSON and get accurate, ready-to-use TypeScript types in seconds.

How to Use

  1. Paste your JSON data into the input editor
  2. Configure options such as interface vs. type alias, export keywords, and root type name
  3. Click Convert and copy the generated TypeScript definitions into your project

Use Cases

  • Bootstrapping TypeScript types from REST or GraphQL API responses
  • Generating type definitions for JSON configuration files
  • Converting mock data or fixtures into type-safe interfaces for testing
  • Speeding up TypeScript development by eliminating manual type authoring

Privacy & Security

All processing happens entirely in your browser. Your data is never sent to any server. This is particularly important when working with API responses that may contain proprietary data structures. You can verify this by checking the network tab in your browser's developer tools — you'll see zero outbound requests.

Ad