API & OpenAPI utility

OpenAPI Diff

Compare endpoint and operation changes between two OpenAPI documents.

● This tool runs entirely in your browser. Your input is never uploaded to our servers.

OpenAPI YAML or JSON

Output

Your result will appear here…

How to use OpenAPI Diff

Paste the base specification, then a line with === TARGET ===, then the target specification.
Select Compare to list added, removed, and changed operations.
Review the documents directly for schema-level details.

Example

Input:

{"openapi":"3.0.3","info":{"title":"Example","version":"1"},"paths":{"/users":{"get":{"responses":{"200":{"description":"ok"}}}}}}
=== TARGET ===
{"openapi":"3.0.3","info":{"title":"Example","version":"2"},"paths":{"/users":{"get":{"responses":{"200":{"description":"ok"}}}},"/teams":{"get":{"responses":{"200":{"description":"ok"}}}}}}

Output:

Added: GET /teams
Removed: none
Changed: none

Use cases

Review API changes between branches.
Inspect endpoint additions before release.
Compare local contract versions without uploading them.

About this tool

Compare endpoint and operation changes between two OpenAPI documents. Processing happens locally in your browser, so your input is not sent to a server or included in analytics.

Frequently asked questions

Does the diff compare every schema detail?

It summarizes endpoint and operation changes; it is not a complete structural diff.