What does API versioning mean in software engineering?

API versioning is the practice of maintaining multiple versions of an API simultaneously to support different clients while allowing the API to evolve. When you need to make breaking changes, you release a new version (like v2) while keeping the old version (v1) available, giving clients time to migrate without service disruption.

How do you use API versioning in a sentence at work?

You would say something like: 'We should plan our API versioning strategy before releasing this breaking change' or 'Our API versioning approach uses URL paths to distinguish between versions.' It is used when discussing how to manage API evolution and backward compatibility.

Is API versioning formal or informal?

API versioning is neutral in formality. It is a standard technical term used equally in casual team conversations, code reviews, and formal architecture documents. Non-native speakers should feel comfortable using it in any professional setting.

What are common API versioning strategies?

The three most common strategies are: (1) URL-based versioning (api.example.com/v1/users vs api.example.com/v2/users), (2) header-based versioning (using Accept headers), and (3) parameter-based versioning (api.example.com/users?version=2). Teams choose based on their client types and use cases.

How long should you maintain old API versions?

Most companies support major versions for 12-18 months after releasing a new version, though this varies. You should clearly communicate a deprecation timeline to clients, giving them sufficient notice to migrate. The exact timeline depends on your client base and the criticality of your API.

API versioning meaning in tech — Speak Tech English

Commonness	5/5
Versatility	4/5
Formality	CasualFormalNeutral
Spoken ↔ Written	SpokenWrittenBoth
Directness ↔ Diplomatic	DirectDiplomaticDirect
Region	US and UK

Say it like this

✓We need to implement API versioning before releasing this breaking change

✓API versioning strategy helps us maintain backward compatibility

✓The client is still using v1 of our API, so we support API versioning

Real examples

in a standup

"We should start planning API versioning for the authentication module since we are making breaking changes next quarter."

in a code review

"This endpoint should include proper API versioning in the URL path to avoid breaking existing integrations."

in a team meeting

"Our API versioning policy requires us to support at least two major versions in production simultaneously."

Don't say this

Handle with care. Do not confuse with software versioning in general. API versioning specifically refers to managing different versions of an API interface, not the entire application.

✕We do not need API versioning because our API is internal only.

✓We should plan for API versioning even for internal APIs because other teams depend on our contract.— Even internal APIs need versioning strategies when multiple teams consume them; internal does not mean unchanging.

✕API versioning means changing the version number of our entire application.

✓API versioning refers specifically to managing versions of the API endpoints and their contracts.— API versioning is distinct from application versioning; it focuses on the API interface, not the entire software product.

✕We should support all ten previous versions of our API indefinitely.

✓We should define a deprecation policy and support major versions for a reasonable period, such as 12-18 months.— Supporting too many versions increases maintenance burden; teams need clear timelines for version deprecation.

Other forms

noun

API versioning

"API versioning is essential when building distributed systems."

noun

API version

"Our service currently supports three API versions in production."

verb

version (an API)

"We decided to version the endpoint differently to maintain compatibility."

Often used with

implement API versioningUsed when starting a versioning strategy for an API

API versioning strategyRefers to the overall approach and plan for managing API versions

API versioning schemeThe specific technical method used, such as URL-based or header-based versioning

deprecate an API versionInforming clients that an older API version will no longer be supported after a certain date

breaking change requiring API versioningA modification to the API that is incompatible with existing clients

Similar words

version managementBroader term that includes all versioning practices; API versioning is more specific

backward compatibility strategyDescribes the goal of API versioning rather than the practice itself

API evolutionDescribes how APIs change over time; API versioning is one tool for managing evolution

Opposites

breaking changes without versioningAPI deprecation without migration path

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Practice

Try it

4 quick exercises

Complete the sentence

1. We must implement _______ before releasing breaking changes to ensure our clients do not experience outages.

Pick the most natural phrasing

2. A colleague asks how you will handle the breaking change. You respond:

We will use API versioning to support both old and new clients.We will versioning the API to make it support both.We will make versioning of API so clients work.We will need to do API changes with versions.

Spot the mistake

3. Which sentence uses API versioning incorrectly?

Our API versioning strategy includes URL-based versioning for all endpoints.We deprecated v1 of our API because of API versioning.The team discussed API versioning to plan the migration path for clients.API versioning allows us to introduce new features without breaking existing integrations.

Rewrite naturally

4. Rewrite this sentence using the term API versioning: 'We have to keep the old way the API works while also making a new way with our improvements.'

Questions

Quick poll

Have you said "api versioning" in a standup this week?

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