JSON → TypeScript Converter
Automatically convert JSON data to TypeScript interfaces.
JSON Input
→
TypeScript Interface
About This Tool
The JSON to TypeScript converter analyzes your JSON data and automatically generates TypeScript interfaces. It infers types for each field — string, number, boolean, null, arrays, and nested interfaces.
The generated interfaces can be pasted directly into your TypeScript project. Especially useful for API responses, configuration files, and data schema definitions.
How to Use
- Paste the JSON data you want to convert into the input field.
- Enter the desired interface name (default: Root).
- Check the conversion result in the TypeScript output area.
- Click the Copy button to copy the result to clipboard.
Use Cases
Used for auto-generating types from API responses, defining types when integrating external data, TypeScript migration of legacy JavaScript code, and creating shared type documentation.
FAQ
- How is null handled? — Null values are represented as the null type. Manually edit if a more precise type is needed.
- What happens with empty arrays? — Empty arrays become unknown[]. Using a sample with actual data yields more accurate types.
- Are nested objects supported? — Yes, nested objects are automatically generated as separate interfaces.