JSON to TypeScript Interface Converter
Convert JSON objects to TypeScript interfaces instantly. Handles nested objects, arrays, and all primitive types.
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What Is a JSON to TypeScript Converter?
A JSON to TypeScript converter transforms JSON data structures into TypeScript interface declarations. Instead of manually writing type definitions, you paste your JSON and instantly get type-safe interfaces that match your data shape — including nested objects and arrays.
How to Use
- Paste your JSON object into the left textarea.
- Optionally set a custom root interface name (default: Root).
- TypeScript interfaces are generated automatically as you type.
- Click Copy to copy the output to your clipboard.
Features
- Generates named interfaces for nested objects automatically.
- Handles arrays with typed elements using the Type[] syntax.
- Supports all JSON primitives: string, number, boolean, and null.
- Customizable root interface name for cleaner output.
- Runs entirely in your browser — no data is sent to any server.
FAQ
Does it handle deeply nested JSON?
Yes. Each nested object gets its own named interface. The name is derived by combining the parent interface name with the field name, e.g. a "address" field inside "Root" becomes "RootAddress".
What happens with arrays of objects?
Arrays of objects generate a dedicated interface based on the first element, and the field type becomes InterfaceName[]. Mixed-type arrays fall back to unknown[].
Is my JSON data safe?
Completely. All conversion happens locally in your browser using JavaScript. No data is uploaded or stored anywhere.