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The normal procedure of running a server-side application, written for example in PHP, involves the flow of a series of instructions that frequently involve calls to external services such as queries for a database, or access to the filesystem for operations reading and writing. All these events are blockers, meaning that the execution of the script is stopped until it receives a response from the external component to which it has requested it.
In this way, the webserver takes most of its time waiting for the blocked processes to complete and this leads to a conspicuous inefficiency in the exploitation of available resources.
In other words, the code tells Node.js what to do when the pending event is completed, but at the same time, it can start new processes and complete them without having to wait for the completion of the still incomplete processes.
This technique applied to the server side can, therefore, have enormous advantages, but at the same time requires special attention to concatenate two or more operations that depend on each other, such as a write operation on a file that must first be created or read via the filesystem. We will return to the most suitable techniques to manage this particular programming style in a specific chapter of the guide.
On the Linux platform, the installation can be completed by compiling the source that is always available from the download page, or, more simply, through the package manager available to the distribution on which we are working. In this page lists commands for the major distributions supported.
Node.js seems to be the system that responds better than others to all these requirements. Its speed, scalability, and efficiency make it ideal for the development of data-intensive applications in real-time. Moreover, for Node.js “real-time” is a cornerstone of its development.
This platform has grown a lot in recent years and has ample support from thousands of Node.js developers around the world, who have contributed more than 650,000 modules (to this date: May 3, 2018), collected within the Node Packaged Modules (NPM). Within this sea of code, there are modules built to work with Arduino, BeagleBone, Intel Galileo, Raspberry PI, BlueTooth, energy control, robotics and so on. Say what you need, NPM will (almost) always be able to provide what you need!
Node.js is not only used for server-side technology in the strict sense: various web-developer software such as LinkedIn, PayPal, Uber, and Netflix are distributed with the Node package manager, npm and rely on its infrastructure to make these open-source tools available on all platforms where you can install it.
Node js develop API is simple. In fact, it has at least three frameworks expressly dedicated to the development of APIs such as Express (my personal choice), Restify and Hapi. All these points clarify how Node.js is one of the best choices if your intent is to: