Online Tool Store
OpenAPI Spec Visualizer
OpenAPI Spec Visualizer is for reading an unfamiliar API quickly; a linter in CI is what stops the spec drifting from the code.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Developer
OpenAPI Spec Visualizer
Frontend preview — no upload or external service.
Endpoint map
A 2,400-line spec rendered as 8 tag groups covering 47 endpoints, with 3 paths flagged as having no summary and 2 schemas defined but never referenced.
How the OpenAPI Spec Visualizer works
- Paste the OpenAPI or Swagger document, in JSON or YAML.
- Group by tag to see the API as its authors organised it, or by path prefix to see the resource structure.
- Look for endpoints with no description and schemas nothing references — both are signs the spec has drifted from the implementation.
FAQ
Which OpenAPI versions work?
OpenAPI 3.x and Swagger 2.0 both parse. The two differ in how request bodies and security are declared, which is worth knowing when reading an older spec alongside a new one.
Does this validate the spec?
It reports obvious structural problems like unreferenced schemas and missing summaries. Full validation against the specification needs a dedicated linter such as Spectral, which also enforces house style rules.
Is my spec uploaded?
No. Parsing happens in the browser, which matters when the spec describes an internal API and lists every endpoint and field in it.
How we compare
| Feature | Online Tool Store | A CLI script | An IDE plugin |
|---|---|---|---|
| Nothing uploaded | ✓ | ✗ | Depends |
| Grouped overview | ✓ | ✓ | ✗ |
| Flags unused schemas | ✓ | ✗ | ✗ |
| No install | ✓ | ✗ | ✓ |
OpenAPI Spec Visualizer is for reading an unfamiliar API quickly; a linter in CI is what stops the spec drifting from the code.