Testing Node.js Applications

Testing is a critical part of modern software development, ensuring that applications behave as expected and maintain reliability as they grow. In Node.js, testing helps verify that the functions, modules, and APIs work correctly, especially in complex, asynchronous environments. Jest, a popular testing framework, is well-suited for Node.js applications, offering built-in assertion libraries, support for asynchronous code, and mocking capabilities.

By incorporating Jest into the development workflow, we can catch bugs early, improve code quality, and gain confidence in the application’s behavior.

Setting up Jest in a Node.js project

To start testing with Jest, we first need to install and configure it in the project. Execute the command below to add Jest as a development dependency: