OpenAPI/Swagger to TypeScript Converter
Generate TypeScript types and interfaces from OpenAPI 3.x or Swagger 2.0 specs instantly. AI-powered with $ref resolution, enum mapping, and optional API client generation.
How It Works
Paste Your Spec
Paste any OpenAPI 3.x or Swagger 2.0 spec in JSON or YAML. The editor validates your spec structure in real-time.
Click Convert
Our AI analyzes your spec, resolves $ref pointers, maps schemas, and generates precise TypeScript interfaces with proper nullability and enum handling.
Copy & Use
Copy the generated TypeScript types or download as a .ts file. Drop them into your project for instant end-to-end type safety with your API.
Why Use This Tool
Type-Safe API Consumers
Generated types ensure your frontend API calls match the spec exactly catch breaking changes at compile time, not in production.
Handles $ref, allOf, oneOf
Complex schema compositions are resolved correctly intersection types for allOf, union types for oneOf/anyOf, and recursive $ref resolution.
No Manual Type Writing
Stop maintaining TypeScript types by hand. Paste your spec and get production-ready interfaces in seconds.
Flexible Output
Choose between TypeScript enums or union types, toggle JSDoc comments, and optionally generate typed API client functions.
FAQ
Does it support both OpenAPI 3.x and Swagger 2.0?
Yes. The converter auto-detects the spec version. For OpenAPI 3.x, it reads from components.schemas. For Swagger 2.0, it reads from definitions. You can also manually select the version.
How accurate is the AI-generated output?
The AI understands OpenAPI semantics and maps types precisely. $ref pointers are resolved, nullable fields are handled correctly, and the output is validated as compilable TypeScript before being returned.
What happens without AI?
The AST fallback generates correct TypeScript types by directly mapping OpenAPI schemas. It handles all standard types, enums, $ref resolution, allOf/oneOf, and nullable fields. AI adds smarter type inference and API client generation.
Can it generate API client functions?
Yes. Choose "Interfaces + API client" or "Interfaces + Fetch wrappers" in the output mode selector. The AI will generate typed functions for each endpoint in your spec.
Does it support YAML input?
Yes. Toggle the input format between JSON and YAML. The converter parses both formats correctly and generates the same TypeScript output regardless of input format.