Which versioning strategy should I use?

URL path (v1/resource) is most common and explicit. Headers are "pure" but less discoverable. Query parameters work but can be overlooked. Most important: be consistent and document clearly.

When should I create a new major version?

For breaking changes: removing fields, changing types, restructuring responses. Minor improvements and additions typically don't need new versions. Be conservative - version proliferation is costly.

How long should I support old versions?

Depends on: client update cycles, breaking change impact, maintenance burden. Common: 6-12 months deprecation period. Critical enterprise APIs may need longer. Communicate timeline clearly.

Can I avoid versioning entirely?

Partially, with careful design: additive changes only, optional fields, expansion (adding never removing). But eventually breaking changes are needed. Plan for versioning from the start.

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API Versioning

Strategies for managing changes to APIs while maintaining backwards compatibility for existing clients.

In-Depth Explanation

API versioning manages the evolution of APIs over time, allowing changes and improvements while minimising disruption to existing clients. Good versioning strategies balance innovation with stability.

Versioning strategies:

URL path: /v1/users, /v2/users
Query parameter: /users?version=2
Header: Accept-Version: v2
Content negotiation: Accept: application/vnd.api.v2+json

Version types:

Major versions: Breaking changes (v1 → v2)
Minor versions: New features, backwards compatible
Patch versions: Bug fixes only

Best practices:

Document all versions clearly
Provide migration guides for major versions
Give clients time to migrate (deprecation period)
Monitor version usage to phase out old versions
Maintain at least one prior major version

Breaking changes:

Removing or renaming fields
Changing field types
Changing URL structure
Changing authentication

Business Context

Good API versioning enables continuous improvement while maintaining trust with API consumers who depend on stability.

How Clever Ops Uses This

We design versioning strategies for Australian business APIs, ensuring they can evolve without breaking integrations.

Example Use Case

"Releasing API v2 with improved response format while maintaining v1 for six months, giving clients time to update their integrations."

Frequently Asked Questions

Related Terms

API (Application Programming Interface)

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