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API Version Detector

Find API version signals in URLs, headers and responses.

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What is API Version Detector?

API Version Detector looks for explicit version signals in an endpoint URL, response headers, media types and JSON response fields. It helps identify how an API exposes version information.

What this tool checks

  • Versioned URL paths such as /v1/
  • X-API-Version and similar headers
  • Versioned media types
  • Common version fields in JSON responses

How to use it

  1. Enter a public API endpoint.
  2. Run the detector.
  3. Review each version signal found.
  4. Compare the result with the API documentation and deployment policy.
Important: Many APIs do not expose an explicit version. Absence of a detected signal does not mean the API has no internal versioning strategy.

Frequently asked questions

Can this discover hidden API versions?

No. It reports observable version signals from the supplied endpoint.

Does an API need /v1/ in its URL?

No. APIs can use headers, media types or other versioning strategies.

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