Type Third-Party API Responses

Generate TypeScript interfaces from third-party API responses where official types are missing or outdated.

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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;
}

Third-Party APIs tips

🤝

Not all APIs ship official TypeScript types. Paste a real response from Stripe, Twilio, GitHub, or any undocumented API and generate your own types.

💡

Test with several different responses from the same endpoint — different requests may return different optional fields. Union the types manually for completeness.

🔍

Third-party API schemas evolve. Save your generated interfaces in a dedicated types/ file and regenerate them when the API updates, then use git diff to spot changes.

📋

Once generated, annotate the interface with a comment showing the API endpoint and date — useful for knowing when the types were last validated against reality.