JSON to TypeScript

Generate TypeScript interfaces from a JSON sample.

Runs in your browser · no upload

JSON to TypeScript

Paste a JSON sample to generate TypeScript interfaces. Keys missing from some array items become optional.

Root type name

JSONTypeScript

export interface Root {
  id: number;
  name: string;
  tags: string[];
  owner: Owner;
  tools: Tool[];
}

export interface Owner {
  email: string;
  verified: boolean;
}

export interface Tool {
  slug: string;
  uses?: number;
}

Questions

Is my JSON uploaded?

No. Everything runs in your browser, so your JSON never leaves your device.

How are optional fields detected?

When an array contains objects, keys that are missing from some of them are marked optional with ?.

Will the types be perfect?

They reflect your sample. Check unions and nullable fields against your real data or API documentation.