Summary  
This chapter covers how to test API endpoints by sending various HTTP requests and verifying response data, status codes, and error handling.

General domain of usage  
Web API testing


After building your API, you need a way to send requests and check responses.

You can use tools like **Postman** to test your endpoints.

With such tools, you can send different types of requests and see how your server responds.

For example:

* GET request: retrieve data;
* POST request: send data;
* DELETE request: remove data.

You can also check:

* Response data;
* Status codes;
* Errors.

Testing helps you verify that your API works correctly before it is used by a frontend or another system.


You have learned how to build a server, define routes, handle requests, and work with data using Express.

So far, everything has been stored in memory. This is useful for learning, but real applications need persistent storage and more structured architecture.

In the next step, you will start working with databases and more advanced backend patterns. This is where your applications become scalable and closer to real production systems.

You now have the foundation to move from simple APIs to full backend development.

Note

Learn how to build backend servers and APIs using Express.js. Create routes, handle requests and responses, and work with real data flows. Gain practical skills needed to start building real backend applications.

Testing Your API