Code generation
JSON to TypeScript
Generate TypeScript interfaces from JSON locally.
What is JSON to TypeScript?
Infer TypeScript interfaces from a JSON example in your browser. Nested objects become their own named interfaces, arrays are typed based on their contents, and optional or inconsistent fields are flagged — giving you a typed starting point instead of hand-writing interfaces from an API response.
How to use JSON to TypeScript
- Paste or type your input into the editor.
- Use the tool action to process your data in the browser.
- Review the output, then copy or download it if needed.
Key features
- Private browser-based processing.
- No account or login required.
- Works without uploading your data.
- Fast results for common developer tasks.
Frequently asked questions
Is JSON uploaded?
No. Generation runs in your browser.
How are nested objects typed?
Each nested object becomes its own named interface, referenced as a property type on the parent interface.
What happens with mixed array types?
If an array contains values of different shapes, the generated type is a union so the interface still matches your sample data.