OpenAPI to TypeScript Converter
Convert OpenAPI and Swagger JSON or YAML specifications into TypeScript interfaces and endpoint types in your browser. Private, fast, and fully client-side.
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What is OpenAPI to TypeScript Converter?
An OpenAPI to TypeScript converter transforms OpenAPI and Swagger API contracts into TypeScript interfaces, aliases, and endpoint metadata that can be used in frontend and backend projects.
Key Benefits
- Create API types quickly from an existing contract
- Reduce manual typing and mismatched request or response models
- Understand reusable schemas and endpoint responses at a glance
- Process private specifications locally without a remote API
- Download output as a project-ready TypeScript file
Common Use Cases
- •Bootstrapping types for a frontend API integration
- •Reviewing an unfamiliar service contract during development
- •Creating typed fixtures from documented response schemas
- •Comparing schema changes during API design reviews
- •Generating a starting point for SDK or client code
How to Convert OpenAPI to TypeScript
- Paste a specification: Paste an OpenAPI or Swagger document in JSON or YAML format.
- Review the conversion: Check the generated schema interfaces and ApiEndpoints output.
- Fix source issues: If parsing fails, validate the document version, indentation, and required fields.
- Copy or download: Copy the TypeScript output or download it as openapi-types.ts.
Key Features
- OpenAPI 3 and Swagger 2 JSON or YAML input
- TypeScript interfaces and aliases from reusable schemas
- Reference, array, enum, union, and nested object support
- Generated endpoint method, path, and response types
- Copy or download clean TypeScript output
Frequently Asked Questions
Which formats are supported?
The tool accepts OpenAPI 3 and Swagger 2 documents in JSON or YAML format.
Does it upload my API specification?
No. Parsing and generation happen in your browser, so the specification stays on your device.
What does the output contain?
It includes TypeScript interfaces or aliases for schemas and an ApiEndpoints interface for documented operations.
Are all OpenAPI features supported?
The converter covers common schemas, references, arrays, enums, unions, objects, and responses. Review generated code for advanced vendor extensions or complex composition.