JSON to TypeScript
Convert JSON objects to TypeScript interfaces or type aliases instantly. Handles nested objects, arrays, and optional properties. Perfect for API response typing.
Examples
Simple object
In:{"name":"Alice","age":30,"email":"alice@example.com","act...
Nested object
In:{"user":{"id":1,"profile":{"firstName":"Bob","lastName":"...
Array of objects
In:{"users":[{"id":1,"name":"Alice","scores":[95,87,92]},{"i...
How to Use JSON to TypeScript
- Paste your JSON in the input area on the left.
- Optionally change the root interface name (default is "Root").
- Choose between "interface" and "type" alias output.
- Toggle optional properties or export keywords as needed.
- The generated TypeScript appears instantly on the right.
- Click "Copy" to copy the result to your clipboard.
What is JSON to TypeScript Conversion?
This tool takes a JSON object and generates TypeScript interface or type alias definitions that describe its shape. It recursively handles nested objects, arrays, and all JSON primitive types (string, number, boolean, null).
Generated types can be used directly in your TypeScript projects to type API responses, configuration files, or any structured data. This saves time compared to manually writing type definitions and reduces the risk of typos or mismatched types.