JSON to TypeScript Converter
Writing TypeScript by hand from API responses wastes time. Paste any JSON and this tool generates ready-to-use interfaces — nested objects become named types, arrays get item types, and fields missing in some records are marked optional. Copy the output straight into your project.
Generated TypeScript
How to use
- Paste your JSON in the box above.
- Set the options (interface name, export, optional fields).
- Click "Convert to TypeScript" — then copy the code or download the .ts file.
Tips
- Set the root interface name to match your codebase naming (for example ApiResponse) before copying.
- Enable ‘detect optional fields’ when some records lack keys — it adds ? instead of forcing every field to be required.
- The output is a starting point: review inferred literal types and widen them where your real data varies.
Frequently Asked Questions (FAQ)
What does this tool do?
Paste your JSON and it generates clean TypeScript interfaces automatically, handling nested objects, arrays and optional fields.
What generation options does it offer?
Root interface name, indent size, the export keyword, readonly fields, semicolons, and optional (?) field detection.
Can I download the generated code?
Yes, copy the code or download it as a .ts file after conversion.
Is my JSON uploaded anywhere?
No, the conversion runs entirely in your browser and nothing is sent to a server.