The Challenges of Evolving Your Service: Api Versioning

Managing API versioning in distributed systems is a constant challenge once a service goes public. Breaking changes require new major versions, which multiply maintenance costs across documentation, support, and code. The post outlines what constitutes backward-compatible changes (adding optional fields, new resources, new events) versus breaking changes. It recommends providing clients with clear migration benefits, change documentation, and migration paths. To reduce the burden of maintaining multiple code branches, an adapter pattern can translate older API inputs/outputs to the latest version at the edge, keeping the core logic unified. A to-do app example illustrates how v1 and v2 clients can coexist using this approach.