usefulweb.site API Explorer of Explorers

Developer & cloud explorers

API Explorer of Explorers

Search 2,500+ public APIs or summarise any OpenAPI spec: servers, auth, endpoints, changes.

Search mode: matched against APIs.guru provider names (e.g. github.com, googleapis.com).

Public URL of a JSON/YAML spec (e.g. a specUrl from search results). Max 4 MiB.

Paste an older version of the same spec to list breaking and non-breaking changes.

Try an example: Summarise a pasted spec (Parcel Tracking API) · Summarise and compare with the previous version

How it works

Search the APIs.guru OpenAPI directory for public APIs (titles, versions, categories, spec links), or paste/link an OpenAPI 3.x or Swagger 2 document (JSON or YAML) to get its servers, authentication schemes and scopes, a full endpoint table with auth per operation, tags, example coverage, schema count and documentation issues. Specs fetched by URL are snapshotted so the next run shows what changed (breaking or not).

  • Directory search: provider names from https://api.apis.guru/v2/providers.json are ranked (exact, prefix, word, substring match); details for the top 5 providers come from https://api.apis.guru/v2/{provider}.json (title, version, categories, OpenAPI version, last update and spec links).
  • Spec summary: servers (OpenAPI servers or Swagger schemes+host+basePath), securitySchemes/securityDefinitions with flows and scope counts, effective security per operation (operation-level overrides the global requirement; [] means public), tags with operation counts and component/definition schema count.
  • Example coverage counts operations whose parameters, request bodies or responses carry example/examples (including examples on referenced schemas).
  • Change detection uses the same direction-aware rules as the OpenAPI Diff Explorer; URL specs are fingerprinted with SHA-256 of their canonical JSON and the snapshot is kept under SHA-256(URL), so the next run reports changes since the last snapshot.

For scripts and AI agents

  • JSON API: POST https://apiexplorerofexplorers.usefulweb.site/api/v1/calculate (same calculation as this page)
  • Interface description: OpenAPI 3.1 · AI guide: llms.txt
  • MCP server (Streamable HTTP): https://apiexplorerofexplorers.usefulweb.site/mcp · tool name api_explorer_of_explorers
Example request
curl -s -X POST https://apiexplorerofexplorers.usefulweb.site/api/v1/calculate \
  -H 'content-type: application/json' \
  -d '{…see OpenAPI examples…}'

Related tools

  • OpenAPI Diff Explorer – Compare two versions of an OpenAPI spec and see exactly which changes break clients.
  • MCP Server Explorer – Inspect any MCP server before you connect an AI agent: tools, permissions, risks, changes over time.
  • Terraform Plan & Drift Explorer – Paste terraform show -json: drift, replacement reasons, attribute diffs and risky deletes.
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