AI TypeScript Interface Generator
Generate TypeScript interfaces and type definitions from JSON data, API responses, or descriptions. Create type-safe code with proper generics and utility types.
TypeScript Interface Generator
Paste a JSON object, describe your data model, or provide an API response, and get properly typed TypeScript interfaces with optional properties, union types, generics, and utility types — ensuring type safety throughout your codebase.
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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.
How to use the TypeScript Interface Generator
Complete the visible fields, submit the TypeScript Interface Generator, and review the generated result before copying it into another workflow.
TypeScript Interface Generator example
Try a short, representative input first so you can compare the response with your source and refine the next run.
TypeScript Interface Generator limitations
The result depends on the supplied context. Verify facts, names, requirements, and audience-specific details before publishing or relying on it.
Frequently asked questions
Short answers for this tool before you move into a full branded assistant.
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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