Middleware layers can be added one by one in multiple invocations of use, or even all at once in series with one invocation. To setup your middleware, you can invoke app.use() for every middleware layer that you want to add (it can be generic to all paths, or triggered only on specific path(s) your server handles), and it will add onto your Express middleware stack. It has a middleware stack that can be customized in app.configure()(this is now deprecated in version 4.x). In a production scenario, we should always use a external session store so that sessions are not shared for every user ( Like we did above for the sake of an explanation ).The app object is instantiated on creation of the Express server. The fourth and the last router is for session destruction. The third router is used for the admin area where the user can only go if he/she is log-in. We are not doing any authentication here for the sake of simplicity. First, which renders the home page, the second router is used for a login operation. In the code shown above, there are four routers. Head over to the official website of Node.js downloads page and grab a copy of Node based on your operating system.Ĭonst bodyParser = require ( 'body-parser' ) It covers everything related to Node.js for Beginners. if you want a deep dive into Node.js you should checkout out our detailed tutorial on Node mentioned below.Ĭheck out our most comprehensive and detailed tutorial about Node. The libuv library internally uses another famous library called libeio, which is designed for threading and asynchronous I/O events and libev, which is a high-performance event loop.

The libuv library provides the following important core features:

The libuv library creates a thread for the I/O operation (file, DNS, HTTP, and so on) and returns a callback.

The libuv library is a cross-platform library that provides an asynchronous I/O facility by enabling an event-driven I/O operation.

Node js express example