How to View OpenAPI Specifications
View and explore OpenAPI (Swagger) specifications online. Free OpenAPI viewer for REST API documentation. Supports OpenAPI 3.x and Swagger 2.0.
Open OpenAPI Spec Viewer →Step-by-Step Guide
Get your OpenAPI spec
Obtain your OpenAPI specification file in JSON or YAML format. You can also use a URL pointing to a publicly accessible spec file, or paste the raw content directly.
Load the spec
Paste your OpenAPI spec into the input area, or enter the URL. The tool automatically detects whether it is JSON or YAML and parses it accordingly.
Explore the API documentation
The viewer renders your spec as interactive documentation. Browse endpoints by tag or path, view request/response schemas, see authentication requirements, and examine parameter details.
Test endpoints (if enabled)
Some OpenAPI viewers allow you to test endpoints directly from the documentation. Enter authentication credentials and parameter values, then send requests to see live responses.
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Open OpenAPI Spec Viewer