OpenAPI Viewer
Paste an OpenAPI 3.x JSON or YAML spec and browse endpoints grouped by tag
About OpenAPI Viewer
OpenAPI Viewer lets you paste an openapi 3.x json or yaml spec and browse endpoints grouped by tag.
Category: API.
Frequently asked questions
What is OpenAPI?
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A standard, language-agnostic specification for describing REST APIs. It defines endpoints, request/response schemas, authentication, and more in a single JSON or YAML document. Formerly known as Swagger.
What is the difference between OpenAPI 2.0 and 3.0?
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OpenAPI 3.0 introduced reusable components, better support for callbacks and webhooks, improved schema composition (oneOf, anyOf), and removed Swagger-specific terminology. Most new APIs use 3.0 or 3.1.
Can I test API calls from the viewer?
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The viewer is for reading and exploring the spec structure — endpoints, schemas, and parameters. For sending live requests, use a tool like curl or an API client.