JSON to TypeScript Converter
Convert any JSON object to a TypeScript interface instantly. Handles nested objects, arrays, optional fields, and union types. Free and client-side.
Frequently asked
questions
The generated interfaces use standard TypeScript syntax compatible with TypeScript 3.0 and above. No advanced features or newer syntax is used, so the output works in all modern TypeScript projects.
null values are typed as null. If you want nullability, you may want to change these to type | null in your final interface. The tool generates a starting point — always review the output before using in production.
Yes — if the root is a JSON array, the tool infers the type of the array elements and wraps them in an interface named after the root name with "Item" appended.