JSON to TypeScript
Convert JSON to TypeScript interfaces instantly. Generates clean, properly typed interfaces from any JSON structure.
// TypeScript interfaces will appear here...Frequently Asked Questions
How does JSON to TypeScript conversion work?
The converter parses your JSON structure and generates TypeScript interfaces that match the data shape. Nested objects become separate interfaces. Arrays are typed based on their contents. Null values become nullable types. The result is clean, export-ready TypeScript code.
What TypeScript types are inferred from JSON?
Strings map to string, numbers to number, booleans to boolean, null to null, and nested objects generate their own interfaces. Arrays with mixed types produce union types. Keys with special characters are automatically quoted.
Can I use the generated interfaces in my project?
Yes. All generated interfaces are exported and ready to paste into your TypeScript project. They follow standard TypeScript conventions and work with any TypeScript version 2.0+.
How are nested JSON objects handled?
Each nested object gets its own named interface. For example, if your JSON has an 'address' field with an object value, the converter creates both a Root interface and an Address interface, with Root referencing Address.
Does it handle arrays of mixed types?
Yes. If an array contains different types (e.g., strings and numbers), the converter generates a union type like (string | number)[]. For arrays of objects, it merges all object shapes into a single interface.
Is there a limit on JSON size?
Since all processing happens in your browser, the only limit is your device's memory. The converter handles JSON files of several megabytes without issues. For very large files, consider using the file upload feature.