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.