Why versioning prevents breaking changes in Rest API - Challenge Your Understanding

Challenge - 5 Problems

🧠 Conceptual

intermediate

Why use versioning in REST APIs?

Why is versioning important in REST APIs to prevent breaking changes?

A It hides errors from clients by masking API responses.

B It allows clients to continue using old API behavior while new features are added.

C It forces all clients to update immediately when the API changes.

D It automatically fixes bugs in client applications.

💡 Hint

Think about how clients rely on API behavior staying the same.

Versioning lets the API keep old behavior for existing clients while allowing new versions with changes. This prevents breaking clients unexpectedly.

❓ Predict Output

intermediate

Output of API versioning example

Given this API URL, what version is being requested?

GET /api/v2/users

A Version 2

B Version 1

C Version 3

D No version specified

💡 Hint

Look at the part after /api/ in the URL.

The URL contains v2 which means version 2 of the API is requested.

❓ Predict Output

advanced

What happens if versioning is missing and API changes?

Consider an API without versioning. The API changes the response format. What is the likely result for existing clients?

A Clients automatically adapt to the new format without issues.

B Clients continue working with the old format without any problem.

C Clients receive the new format and may break if not updated.

D The API rejects all requests until clients update.

💡 Hint

Think about how clients expect data in a certain format.

Without versioning, clients get unexpected data formats and may fail because they rely on the old format.

🧠 Conceptual

advanced

How does semantic versioning help prevent breaking changes?

Semantic versioning uses numbers like MAJOR.MINOR.PATCH. Which part signals a breaking change?

A MAJOR version increase

B MINOR version increase

C PATCH version increase

D No version number change

💡 Hint

Breaking changes usually require a big version update.

Increasing the MAJOR version signals breaking changes, so clients know to expect possible incompatibilities.

🚀 Application

expert

Identify the correct versioning strategy to avoid breaking clients

You maintain a REST API used by many clients. You want to add a new required field to a response without breaking existing clients. Which versioning strategy should you use?

A Add the new field directly to the current API version without versioning.

B Change the API URL path without changing the version number.

C Remove an old field and add the new field in the same version.

D Create a new API version with the new field and keep the old version unchanged.

💡 Hint

Think about how to keep old clients working while adding new features.

Creating a new version lets new clients use the new field while old clients keep working with the old version.