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OpenAPI Viewer
Explore and inspect OpenAPI specifications.
Inspect an OpenAPI specification
Paste OpenAPI 3.x or Swagger 2.0 JSON or YAML to explore its metadata and endpoints.
Your API specification is parsed locally and is never uploaded.
About this tool
What is OpenAPI Viewer?
An OpenAPI viewer helps developers understand API specifications by summarizing metadata, servers, schemas, tags and available operations. BigForgeKit accepts JSON and YAML and parses specifications entirely in your browser.
Features
Built for fast developer workflows
- Parse OpenAPI 3.x JSON and YAML specifications.
- Inspect Swagger 2.0 documents.
- List paths, HTTP methods and operation identifiers.
- Filter API operations by tag.
- Summarize servers and schema counts.
- Copy the parsed specification as normalized JSON.
Frequently asked questions
Questions about OpenAPI Viewer
Does this viewer validate every OpenAPI rule?
No. This version validates the document format and essential OpenAPI structure, but it is not a complete JSON Schema or OpenAPI conformance validator.
Can I open Swagger 2.0 specifications?
Yes. Swagger 2.0 documents are supported alongside OpenAPI 3.x specifications.
Are YAML specifications uploaded?
No. JSON and YAML parsing occur locally inside your browser.
Why are some OpenAPI versions rejected?
The viewer currently targets OpenAPI 3.x and Swagger 2.0. Older or future incompatible versions may require different parsing rules.
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