Question 1

OpenAPI and Swagger: What is the difference?

Accepted Answer

Swagger was the original name for the API specification format. In 2015, it was renamed to OpenAPI when donated to the Linux Foundation. Swagger 2.0 is the older format, while OpenAPI 3.0+ is the current standard. Both describe REST APIs with endpoints, parameters, request/response schemas. This tool supports both formats.

Question 2

How to use this OpenAPI viewer?

Accepted Answer

Paste your OpenAPI 3.x or Swagger 2.0 specification (JSON or YAML format) into the text area, then click Display. The tool parses the specification and shows API info, server URLs, tags, and all endpoints with their parameters, request bodies, and responses. Click any endpoint to expand its details.

Question 3

What OpenAPI versions are supported?

Accepted Answer

This viewer supports OpenAPI 3.0.x, OpenAPI 3.1.x, and Swagger 2.0 specifications. Both JSON and YAML input formats are supported. The tool extracts API info, servers, tags, endpoints, parameters, request bodies, and responses from the specification.

OpenAPI Viewer — API仕様ビューアー

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