Code Smell 303 - How to Prevent Breaking Existing Clients When You Make Changes | HackerNoon
Briefly

Failure to version APIs can lead to serious consequences, including client application crashes and integration failures. By not maintaining backward compatibility, developers risk breaking their clients' software, which can lead to downtime and user experience problems. Implementing solutions like semantic versioning and backward compatibility helps establish stability and reliability in software development. Clear communication about new versions, gradual feature deprecation, and thorough testing are key strategies to mitigate issues and maintain the trust of API consumers.
When you modify APIs without proper versioning, you create breaking changes that affect all existing clients. This breaks the implied contract between providers and consumers.
Proper versioning ensures smooth transitions and maintains your system's reliability. Clients tolerate defects in new functionalities, but never a previously stable behavior that’s broken.
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