27 API Change Types Detected Automatically — OpenAPI Diff Engine

Published: 22 March 2026
on channel: Delimit

Delimit's diff engine detects 27 types of API changes — 17 breaking, 10 non-breaking.

Breaking changes detected:
• Endpoint removed • Method removed • Required parameter added
• Field removed from response • Type changed • Enum value removed
• Response code removed • Parameter removed • Required field added
• Format changed • Parameter type changed • Security removed
• Security scope removed • Max length decreased • Min length increased
• Response type changed • Parameter required changed

Non-breaking (additive):
• Endpoint added • Parameter added • Response added
• Enum value added • Field added • Security added
• Deprecated added • Default changed • Description changed
• Optional field added

All detection is deterministic — same input, same output. No AI inference.

🔗 Links:
Full reference: https://delimit.ai/api-breaking-changes
Playground: https://delimit.ai/playground
GitHub: https://github.com/delimit-ai/delimit

#openapi #apidiff #breakingchanges #semver #apigovernance #swagger

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