Browse OpenAPI Specs Locally
OpenAPI (formerly Swagger) is the standard format for describing REST APIs. This viewer parses OpenAPI 3 JSON entirely in your browser — ideal for quickly understanding endpoints without spinning up Swagger UI or uploading specs to third-party services.
Frequently Asked Questions
Does this support YAML specs?
Currently this tool accepts OpenAPI 3 JSON only. If your spec is in YAML, convert it to JSON first using any YAML-to-JSON converter, then paste the result here.
Is my API spec uploaded anywhere?
No. Parsing and rendering happen entirely in your browser via JavaScript. Your specification never leaves your device.
What OpenAPI features are shown?
The viewer lists all path/method combinations with summaries. When you select a row, it shows parameters, request body schema (with $ref resolution), and response schemas by status code.