OpenAPI / Swagger Preview
Paste an OpenAPI or Swagger YAML/JSON spec and see rendered endpoints, schemas, and a live API documentation preview.
Paste an OpenAPI specification to see a rendered preview.
How to use the OpenAPI / Swagger Preview
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Paste your OpenAPI YAML or JSON.
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Browse the rendered documentation.
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Use it to review or present your API design.
What is OpenAPI?
OpenAPI (formerly Swagger) is the standard format for describing REST APIs. Reading raw YAML is tedious; this tool parses and renders it as clean, navigable documentation grouped by tag, with expandable endpoints and schema tables. All rendering happens in your browser.
Key features
- Renders OpenAPI 3.x and Swagger 2.0 specs
- Grouped by tag with expandable endpoints
- Schema and parameter tables
- Runs entirely in your browser
Frequently asked questions
Does it support OpenAPI 3.1?
Yes — OpenAPI 3.0 and 3.1 are supported, plus legacy Swagger 2.0.
Can it validate my spec?
It shows parse errors with line numbers. Full JSON Schema validation of the spec itself is on the roadmap.
Is my API spec uploaded?
No — rendering happens entirely in your browser.