What is node.js and what is it for?
Scalability is one of its main objectives
Node.js was formulated to generate a scalable system that had sufficient consistency to generate a high number of connections simultaneously with the server. Generally, when a large number of connections are created, the performance and speed of applications and web pages are impaired. This is because of the vast majority of technologies that work from the server-side trigger requests in isolation and through independent threads. Therefore, when the number of requests made increases, the resources and their consumption also increase. To this type of limitations that are generated on the server itself, it is also necessary to add all those that the client has (from the speed of his internet connection or the RAM of his device for example).
A server is responsible for executing different tasks to facilitate communication with different clients. These tasks are grouped under the acronym I / O that refer to those that are intended for input (input) and output (information). In classical programming languages such as Java, these types of tasks were carried out synchronously. What does this mean? That all were executed linearly so that until one process was not carried out the next one could not be executed. This brings many drawbacks, such as the unnecessary lengthening of work processes and the tendency for blockages to occur. However, NodeJS uses an asynchronous I / O. This means that all the tasks carried out by the server are done in parallel so they can be performed simultaneously and without any blockage in the workflow. The result is a considerable competitive advantage that gives the architecture of web applications greater power and processing speed.
When a Node.js application needs to perform a blocking operation (I / O operations such as working with files … etc) it sends an asynchronous task to the event loop, along with a callback, and then continue.
The importance of events in NodeJS
Its architecture is based on events and thanks to it, as it has made possible to generate a type of asynchronous processing of input and output operations. It is based on a single process thread capable of containing all the events that occur. As events occur, your system can work with them at different levels through its callback function. In this way, different processes will not be developed at the same level. Although all events are part of the same process thread, they will work with them through parallel functions within the same loop. When a task in the background is executed, the callback function resolves the delivery of the result and can be delivered to the client in a very short time.
To generate a connection between two or more devices, the most normal thing is an element called a server whose function is to mediate between the different users that initiate the connection. These users or customers establish direct communication with the server and receive information that can be of any kind: From a web page to any type of notification or message issued by any other client.
Library Manager Node Package Manager
One of the strengths of nodeJS is its Node Package Manager (an NPM package). A kind of manager that gives access to a very large set of libraries that are also free and generated from the collaboration of users in their community. Some of the best-known packages that you can find on their platform are React, Gulp, Browserify, Grunt-CLI, Bower, Grunt, Express, Cordova or Forever. (You can get more information by accessing their official website at npmjs.org ).
Why use NodeJS?
- It is a language that can be used on the vast majority of servers, including the best known as Unix, Microsoft or Mac.
- A good part of the most efficient and better-optimized platforms on the network, such as Linkedin or Paypal, was developed from NodeJS, which are faithful indicators of quality and potential.
- Guarantees high performance. It can not only generate strong and powerful architectures but it also dramatically reduces the error rate.
- Its high scalability has taken the world of programming to a new level. Nowadays developers can generate powerful applications with an amazing scalable capacity. But what does this translate into? In web applications with surprising potential as semantics that allow thousands and thousands of requests to a single server simultaneously. This has allowed multiplying the capabilities of web applications that until then could support up to a maximum of four thousand users per server. However, NodeJS has allowed multiplying the capacity to host active users in applications and without the need to increase server infrastructure.
- It is perhaps the most competitive option to design applications that manage large amounts of information generated by a high user community. A good example would be Facebook, a platform that generates hundreds of thousands of comments and content for every second.
- Thanks to the fact that NodeJS allows working both from the server and from the client, it is possible to generate a much faster and immediate transfer of information. The ultimate outcome of all this is a considerable reduction in work periods.
- Due to its high performance to manage and process large simultaneous volumes of information, NodeJS is a star option for the development of applications such as online chats or interactive games.
- It is designed to encourage the exchange between users and programmers: It has developed a fairly broad community that allows very interesting collaboration ties from different perspectives, which is very enriching for developers. Besides being a popular language and used by professionals around the world it is easy to find information and resources on the Internet.