Generate strict TypeScript interfaces, types, and type guards automatically from any JSON response
Processed client-side in your browser — files never leave your device.
Free, with no signup, account, or usage limits.
Works on any modern browser, including mobile.
About this tool
JSON to TypeScript generator automatically infers and creates strict TypeScript interfaces, types, readonly modifiers, and optional field definitions from JSON.
How to use
Paste your API JSON response or data structure.
Set your root interface name and formatting preferences (interface vs type).
Enable optional fields or readonly modifiers if desired.
Copy the generated TypeScript definitions into your project.
FAQ
Does it handle nested objects and arrays?
Yes! All nested objects and array element schemas are recursively generated as distinct interfaces.
Can I make properties readonly?
Yes, toggle the Make fields readonly checkbox.
What does JSON to TypeScript Interfaces do?
JSON to TypeScript generator automatically infers and creates strict TypeScript interfaces, types, readonly modifiers, and optional field definitions from JSON.
How do I use JSON to TypeScript Interfaces?
Open the JSON to TypeScript Interfaces tool, then paste your API JSON response or data structure.