API Versioning Decisions That Haunt You Later

Most backend teams underestimate the long-term cost of versioning decisions made at v1, learning only when scaling forces painful parallel maintenance at v3 and beyond. This guide demystifies three versioning strategies and clarifies which changes actually demand new versions—cutting through the versioning theater that leads to 2 AM production incidents. The difference between a sustainable API strategy and one you'll regret hinges on understanding these early architectural choices.