Versioning and Maintaining APIs
Why Version an API?
As APIs evolve, changes can break existing clients. Versioning lets you introduce new features or fix issues while keeping older integrations working.
Common Versioning Strategies
| Strategy | Example |
|---|---|
| URI versioning | /v1/users, /v2/users |
| Header versioning | Accept: application/vnd.api.v2+json |
| Query parameter versioning | /users?version=2 |
Maintaining Collections Alongside Versions
Postman collections can be forked or duplicated per API version, keeping requests, tests, and documentation aligned with each supported version.
Deprecating Old Versions
Clear deprecation notices in documentation, along with monitors tracking usage of older versions, help teams retire outdated endpoints safely.
Wrapping Up
From authentication and scripting to mocking, documentation, and versioning, Postman supports the full lifecycle of designing, testing, and maintaining reliable APIs.
This completes the Postman API Testing course roadmap - from your very first request to designing and maintaining production-grade APIs.
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