A well-liked Node.js web application framework, Express.js is renowned for its adaptability and simplicity. Although many developers are familiar with Express.js's fundamental functionalities, there are a few lesser-known features that can improve your comprehension and utilisation of the framework:

Middleware Execution Order: To manage HTTP requests, Express.js makes use of middleware. Because middleware is performed sequentially, the order in which it is defined matters. When middleware functions are used with app.use() or similar methods, they are run in the order that they are inserted. It is important to comprehend this because the middleware order can affect the outcome.
Multiple template engines, including EJS, Pug, and Handlebars, are supported by Express by default. Nevertheless, it also comes with an integrated template engine known as express-generator, which by default use the EJS templating language. Setting up a simple project structure with views and routes may be done quickly this manner.

Express Generator is a command-line utility that aids in creating the fundamental framework of an Express application. For more complex projects, it's a helpful place to start, and developers can alter the generator's templates to suit their needs.