AI TypeScript Interface Generator

Yes, paste a JSON object and the AI infers TypeScript types from the values — strings become string, numbers become number, arrays get proper element types, and nested objects generate separate interfaces. It goes beyond basic inference by recognizing patterns like ISO dates becoming Date types, UUIDs becoming branded types, and enumerable values becoming union types.

Yes, nested objects generate separate named interfaces that are referenced by the parent type. Recursive structures like tree nodes or comment threads generate self-referencing types. Arrays of objects get their element type extracted into a named interface. This produces clean, readable type definitions instead of deeply nested inline types.

Interfaces support declaration merging and are generally preferred for object shapes. Type aliases are more flexible and can represent unions, intersections, and mapped types. The Both option generates interfaces for main data shapes and type aliases for utility types like partial updates, creation inputs, and API response wrappers.

The Advanced feature level generates utility types alongside your main interfaces — CreateInput types that omit auto-generated fields like id and timestamps, UpdateInput types that make all fields optional with Partial, response wrapper types for paginated API responses, and pick types for specific views. These utility types reduce boilerplate in your application code.

The generator produces highly accurate types that match your actual API response shape. It correctly handles nullable fields, optional properties, discriminated unions for polymorphic responses, and nested array types. For the most accurate results, provide a real API response as input so the types match your actual data rather than idealized schemas.