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JSON to TypeScript

Paste JSON and instantly get TypeScript interfaces or type aliases with nested types

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Root name

JSON Input

TypeScript Output

interface Root {
  id: number;
  name: string;
  email: string;
  isActive: boolean;
  roles: string[];
  address: {
    street: string;
    city: string;
    zip: string;
  };
  scores: number[];
}

How it works

• Paste any valid JSON and get a TypeScript interface or type alias.
• Nested objects become inline types. Arrays are inferred from the first element.
• Change the root name to customize the top-level identifier.
• Everything runs locally in your browser — no data is sent anywhere.