AI TypeScript Interface Generator
Type-Safe Code Starts with Good Type Definitions
TypeScript's power comes from its type system, but writing comprehensive type definitions is tedious. Our generator produces complete, accurate interfaces from your actual data — JSON responses, database models, or plain descriptions — giving you the type safety benefits without the manual typing work.
From JSON to Typed Interfaces in Seconds
Manually translating JSON structures into TypeScript interfaces is error-prone and time-consuming, especially for complex nested objects. Our generator handles the conversion automatically, inferring appropriate types, marking optional fields, and creating separate interfaces for nested structures — all following TypeScript naming conventions and best practices.
Frequently Asked Questions
Can the generator infer types from JSON data?
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.
Does the generator handle nested and recursive 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.
What is the difference between interface and type alias output?
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.
Does the generator create utility types?
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.
How accurate are the types for API responses?
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.
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