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JSON to TypeScript Converter (Offline & Secure)
Free online JSON to TypeScript converter — paste JSON and generate clean interfaces with nested type extraction and union type detection. No data sent to servers.
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 & Important Considerations
- 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.
Frequently Asked Questions
Is this JSON to TypeScript safe for sensitive corporate data?
Yes, 100%. All processing runs client-side in your local browser memory. No text, tokens, payloads, or logs are ever transmitted to any remote server or analytics engine.
Can I use this tool offline?
Yes. Because this tool runs strictly on client-side JavaScript with zero external API dependencies, once loaded it functions completely offline.
100% Client-Side Privacy Guarantee
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.