How to Convert JSON to TypeScript

When consuming a REST API in a TypeScript application, you need interfaces to define the shape of the data. Manually writing these interfaces for large JSON responses is slow and error-prone.

Automated Generation

You can generate TypeScript interfaces automatically based on the JSON payload.

JSON Input:

{
  "user": {
    "id": 123,
    "username": "coder99"
  },
  "roles": ["admin"]
}

Generated TypeScript:

interface RootObject {
  user: User;
  roles: string[];
}

interface User {
  id: number;
  username: string;
}

Using JSON Format Tools

You can instantly generate these interfaces using our JSON to TypeScript Converter. Just paste your JSON API response, and it will output clean, nested TypeScript interfaces ready to drop into your project.