Generate TypeScript Types from API Responses

Paste an API JSON response and instantly generate TypeScript interfaces to type-safe your frontend code.

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Root interface name

JSON input

TypeScript output

export interface User {
  id: number;
  name: string;
  email: string;
  isActive: boolean;
  score: number;
  tags: string[];
  address?: null;
}

export interface Root {
  user: User;
  createdAt: string;
  version: number;
}

API tips

🔌

Paste the raw JSON from your browser's network inspector (Response tab) to generate TypeScript interfaces that match your actual API shape.

💡

Rename the root interface to match your resource name (e.g., "User", "Order", "Product") so the generated type is immediately usable in your codebase.

🧩

Nested objects automatically become separate named interfaces. For example, an "address" field generates both a root interface and an "Address" sub-interface.

⚡

After generating, add undefined | to optional fields that might not always be returned by the API. The generator marks null values as optional (?) automatically.