JSON to TypeScript

Why Generate TypeScript Interfaces from JSON?

When working with external APIs, you often receive JSON responses with complex, nested structures. Manually writing TypeScript interfaces for these responses is tedious and error-prone. This tool automates the process — paste the API response JSON, and get ready-to-use TypeScript interfaces instantly.

How to Use the Output

1. Paste your JSON response (from an API, mock data, or fixture)
2. Set the root interface name to match your data (e.g., User, Product, ApiResponse)
3. Click Generate TypeScript
4. Copy the output and paste it into your .ts or .d.ts file
5. Review and adjust optional fields (add ? for nullable properties)