JSON→TypeScript

The fastest way to add types to an API integration: copy the JSON response from Postman, paste it here, copy the generated interface. The entire process takes under 10 seconds and produces types that accurately reflect the actual API shape.

Step-by-step

In Postman, send your request and select all of the response body (Ctrl+A). Paste into the JSON input above. Set the root interface name (e.g., UserResponse), toggle options, copy output into your types/ folder.

Why this beats writing types by hand

A deeply nested response with nullable fields can take 20–30 minutes to type correctly. This tool does it in milliseconds. For large APIs, the time savings compound into hours per sprint.

Using the Zod output

Switch to Zod mode to get a z.object() schema for runtime validation — useful when you don't fully control the backend and the response shape might drift from documentation.

Every any is a broken promise to the compiler. It disables type checking entirely — TypeScript provides zero protection when a value's shape changes or is misused.

What type safety prevents

• Refactoring safety — rename a field and every broken usage becomes a compiler error, not a production crash.
• Self-documenting code — interfaces are the most accurate documentation that exists because they're enforced.
• API contract enforcement — backend shape changes surface every affected line immediately.
• Onboarding speed — a new dev can understand an unfamiliar API by reading its interface in under a minute.