JSON to TypeScript
Convert any JSON object to TypeScript interfaces instantly. Supports nested objects, arrays, optional fields, and type inference. Free, browser-based.
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Instantly convert JSON objects into TypeScript interfaces with automatic type inference. Perfect for API responses, config files, or any JSON data—save time on manual interface writing and ensure type safety across your project.
How it works
- 1Paste your JSON object into the editor
- 2Tool automatically detects types and generates interfaces
- 3Review nested objects, arrays, and optional fields
- 4Export the .ts file or copy to clipboard
Who uses this tool
- ✓Backend developers integrating REST APIs with TypeScript
- ✓Frontend engineers typing API response objects quickly
- ✓Full-stack teams standardizing JSON-to-interface workflows
- ✓DevOps engineers creating configs with strict typing
- ✓Developers migrating JavaScript projects to TypeScript
Frequently Asked Questions
How do I use JSON to TypeScript?
Paste your JSON object on the left. TypeScript interfaces are generated instantly on the right. Copy or download the .ts file.
Is JSON to TypeScript free?
Yes, JSON to TypeScript on ToolPix is 100% free with no signup or installation required.
Is my data safe?
All conversion happens in your browser, your JSON never leaves your device.
Does it handle nested objects and arrays?
Yes — nested objects generate child interfaces and arrays generate typed array fields like items: Item[].
Can it detect optional fields?
Yes — fields that are null or missing in the sample JSON are marked as optional (field?: type) in the generated interface.
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