APIs change as products change. Versioning is useful, but a version number alone does not protect clients; compatibility rules, documentation and communication do the harder work.
Identify breaking behavior
Removing a field, changing its meaning or requiring a new input can break an existing client. Some additions also cause trouble when callers assume a closed set of values. Review the contract from a consumer's perspective before treating a change as safe.
Prefer additive changes where possible
Add optional fields and new endpoints when they solve a need without changing established behavior. Keep old defaults stable. If a new model is clearer, introduce it alongside the old one and provide a deliberate migration path.
- Publish a change log with examples.
- State when old behavior will stop working.
- Provide a test environment or contract examples.
Choose a versioning policy
Path, header and media-type versions are all possible approaches. Choose one that your clients can use consistently. Decide how long versions remain supported and who owns migrations; otherwise versions accumulate indefinitely.
Observe real client usage
Before removing an old version, check which clients still call it and whether those calls are critical. Give owners clear notice and a way to test the replacement. Deprecation should be an operational process, not just a line in documentation.
Practical next step
Treat compatibility as a promise to integrators. Versioning works best when paired with stable contracts and a practical migration process.
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