API Diff

Paste two versions of an API response, either as plain text for a classic line-by-line diff or as JSON for a structural comparison, and see exactly what changed rather than eyeballing two large payloads. In JSON mode both objects get flattened to dot-notation paths and compared value by value, so you get a precise list of fields added, removed, or changed, which is useful for catching a breaking change in a PR that touches a serializer or an integration test comparing a mock against a real response. Arrays are compared by position as whole values rather than recursed into, so a reordered array will show up as changed even when the same items are still present elsewhere. It handles JSON specifically; there's no YAML or XML support, so those need converting to JSON first.