Developer Utilities

OpenAPI Validator & Endpoint Explorer

Validate OpenAPI 3 documents and explore endpoint operations locally.

What the structural validator checks

The parser accepts JSON or bounded YAML input, requires an OpenAPI 3 version, info title and version, and a paths object, then inventories standard HTTP operations. It reports missing responses, duplicate operation IDs, unmatched or optional path-template parameters, unusual response keys, unresolved local references, unsupported root versions, and unknown Path Item fields.

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How the endpoint explorer summarizes the contract

  • Each row shows method, path, summary, operationId, response keys, deprecation, and effective security status.
  • Operation-level security overrides root security; an empty security array is shown as explicitly public.
  • Search covers path, summary, operationId, and tags, while the method selector narrows the visible operation list.
  • The normalized JSON view makes YAML parsing results and merged aliases visible for review.
  • External references are counted and reported without any browser request.

Validation and security boundaries

A structurally valid document can still contain incompatible schemas, invalid examples, broken callbacks, incorrect media types, generator-specific extensions, unusable authentication flows, or business behavior that does not match the implementation. Local $ref resolution checks existence but does not fully dereference every semantic context. YAML depth, aliases, merge expansion, and total input size are bounded to protect browser responsiveness.

Related developer tools

Continue with cURL Builder & Fetch Converter, HTTP Headers Parser, JSON Schema Validator.

cURL Builder & Fetch Converter

Build cURL requests or convert safe cURL input to JavaScript fetch

HTTP Headers Parser

Convert raw HTTP headers to JSON and back

JSON Schema Validator

Validate JSON documents against JSON Schema rules

How to Use OpenAPI Validator & Endpoint Explorer

  1. Paste an OpenAPI 3 JSON or YAML document, or load the synthetic sample.
  2. Validate and review errors before warnings; correct unresolved local references and operation contract gaps.
  3. Search or filter the endpoint table to inspect methods, responses, IDs, and inherited security.
  4. Copy the normalized JSON when useful, then run the target ecosystem validator and generator in CI.

Frequently Asked Questions

Which OpenAPI versions are supported?

The structural analyzer accepts version strings for OpenAPI 3.0, 3.1, and 3.2. Swagger 2.0 is reported as unsupported rather than being silently converted.

Are external $ref documents downloaded?

No. Local fragment references beginning with # are resolved inside the pasted document. File and network references are listed as warnings but are never fetched, which keeps analysis local and avoids hidden network access.

Does a valid result guarantee full OpenAPI conformance?

No. This is a focused structural analyzer, not the official schema plus every semantic rule. Use a version-specific validator and the target generator or gateway in CI before publishing an API contract.

Sources & references

Primary references: OpenAPI Specification; YAML 1.2.2 Specification; RFC 6901: JavaScript Object Notation (JSON) Pointer.

Review policy: references and behavior notes are checked whenever the tool implementation changes.