💻 JSON to TypeScript Interface Generator — Free Online
Paste a JSON sample and get clean TypeScript interface definitions. Handles nested objects and arrays automatically.
Input
Result
Private by design. This tool runs entirely in your browser — nothing you enter or add is uploaded to any server.
How it works
- Paste a valid JSON object or array into the input.
- Optionally change the root interface name.
- Press Generate TypeScript to get interface definitions.
Examples
- Convert an API response sample into types for your frontend code.
- Generate interfaces from configuration JSON.
- Quickly scaffold types from mock data.
Frequently asked questions
Does this upload my JSON?
No. Everything runs locally in your browser. Your JSON never leaves your device.
Does it handle nested objects?
Yes. Nested objects and arrays of objects become separate interfaces with proper references.
What if my JSON is invalid?
You will see a clear error message pointing to the problem.
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