JSON to TypeScript Converter

Generate TypeScript interfaces from JSON data

Root:

JSON Input

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TypeScript Interfaces

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JSON to TypeScript Converter Online

How to use JSON to TypeScript

Paste or type raw JSON data into the left Input panel.
Optionally customize the root interface name using the Root Interface input field.
Click 'Generate' or watch the TypeScript interfaces appear automatically in real-time in the right Output panel.
Click 'Copy' on the output panel to copy the generated TypeScript definitions to your clipboard.

Edge Cases & Limitations

JSON input must have an object or array of objects at its root.
Nested objects will automatically be extracted into separate named TypeScript interfaces.
Heterogeneous arrays will generate union types when appropriate.

Keyboard Shortcuts

Ctrl/Cmd + K — Open Command Palette to switch tools instantly.

100% Client-Side Privacy

All inputs are processed entirely inside your browser's memory using JavaScript. No data is ever transmitted to any server. Your tokens, JSON payloads, cURL commands, and timestamps never leave your machine.