JSON ↔ TypeScript Interface & Type Generator

Tool Overview

Converting TypeScript types and interfaces into JSON or turning JavaScript objects into TypeScript definitions can be a repetitive task. This TypeScript converter makes it easier to move between JavaScript objects, JSON data, and TypeScript types or interfaces without manually writing every property. Paste your code, choose the conversion you need, and generate clean TypeScript or JSON output in seconds.

What can you do?

1. 1. TypeScript Type to JSON
   Convert TypeScript type definitions into a JSON example automatically. This is useful when you have a type such as `type User = { id: number; name: string; }` and need a JSON structure based on it.
2. 2. TypeScript Interface to JSON
   Turn TypeScript interfaces into example JSON data without manually creating every property. The converter understands common TypeScript property types, nested objects, arrays, and optional properties.
3. 3. JSON or JavaScript Object to TypeScript
   Convert JSON data or js object into a TypeScript type or interface. Paste an API response or JSON object and generate a TypeScript definition that matches its structure.
4. 4. Nested Objects and Arrays
   Handle more than simple properties. The converter can generate definitions for nested objects, arrays, strings, numbers, booleans, and other common data structures.
5. 5. Copy the result
   Copy the generated TypeScript or JSON output with one click and use it directly in your project, API documentation, test data, or development workflow.

Why use this TypeScript converter?

Writing TypeScript types and interfaces by hand can become tedious, especially when working with large JSON responses or JavaScript objects. A single API response may contain dozens of properties and several levels of nested data. Instead of manually identifying each property and assigning its type, this tool generates the structure for you. Whether you need to convert TypeScript types to JSON, TypeScript interfaces to JSON, JSON to TypeScript, or JavaScript objects to types and interfaces, you can quickly create a useful starting point and get back to building your application.