JSON to TypeScript

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About this tool

What it does: Converts JSON data into TypeScript interface definitions with automatic type detection.

How to use: 1. Paste JSON data; 2. TypeScript interfaces are generated automatically; 3. Click Copy to grab the result.

Special handling: Arrays are simplified to a single element type (e.g. roles: RoleItem[]); null values become optional properties (marked with ?).

Show example values: When enabled, each property is followed by a sample of its original value.

Simplified raw data: When enabled, shows the JSON with duplicate array elements removed.

Your data stays yours

100% local
Everything runs in your browser
Zero uploads
Files are never sent to a server
No sign-up
Free to use, no account needed

JSON to TypeScript FAQ

Answers to the most common questions about using this tool.

Is this tool free to use?

Yes — every ConvTop tool is 100% free, with no sign-up, no limits and no watermark.

Is my data safe with this tool?

Yes. Everything runs locally in your browser — your input never leaves your device, so sensitive data stays private.

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