Node. JS is software designed to develop web-based applications and is written in the syntax of the JavaScript programming language. If during this time we know JavaScript as a programming language that runs on the client/browser side only, then Node. JS exists to complement the JavaScript role so it can also apply as a programming language running on the server-side, just like PHP, Ruby, Perl, and so on. Node. JS can run on Windows, Mac OS X and Linux operating systems without the need for any program code changes. Node. JS has its own HTTP server libraries so it is possible to run a Web server without using a Web server program such as Apache or Nginx.

To execute Javascript as the server language required a fast engine and has good performance. Google's Javascript engine named V8 is used by Node.js it is also the engine used by the Google Chrome browser.

Unlike the server-side programming language in general blocking, Node. JS is non-blocking, as JavaScript works. Node. JS runs on an event-driven basis. The intention of Blocking is simply that a program code will be executed until it is completed, and then switch to the next program code.

Suppose we have a program with the following algorithm:
·       Accept the request for the blog page
·       Retrieve blog data from a database
·       Write HTML contains blog data
·       Send response to Client

If we use a multi-threaded blocking programming language, the second point when the program retrieves data from the database for a certain period of time on a thread, another thread is set up to run the third point (i.e. writing data from the database into the HTML form) will not be executed until the thread for the second bullet returns the data. This is actually not a problem because the CPU runs the process very quickly. Just that, Node. JS with its single-threaded performs differently.
Node. js, instead of allocating the thread for each point, it will only create threads only when an event requires it. For example, when the program fetches data from a database, the program will only create threads or in other words start processing the third point only when data from the database is received, using callbacks. In addition, if there are other processes that are not dependent on that data, then the process will be executed without having to wait for the data retrieval to be completed.
Who is the first time Node.js maker?

Node. JS was first created and introduced by Ryan Dahl, in 2009 so JavaScript could be used as a server-side programming language, a classmate with PHP, ASP, C#, Ruby and so on. Ryan Dahl is a developer of Joyent who is a software company and Cloud infrastructure. He had an interest in the single-threaded implementation of the server-side programming language and eventually chose JavaScript as the language for Node, having previously tried to use Haskell, Lua, and C.
 Advantages of using Node. Js
·       Node.js uses the claimed JavaScript programming language as the most popular and widely known programming language for the wider community
·       Node.js is capable of handling thousands of connections along with the minimum resource usage for each process
·       Node.js is especially reliable for creating real-time applications
·       Node.js is an open-source project, so anyone can see the code structure and can also contribute to its development
·       Server-side JavaScript and also client minimizes discrepancies between two sides of a programming environment, such as related data communication which uses the same JSON structure on both sides, the same form validation that can be executed Server and client-side, etc.
·       NoSQL databases such as MongoDB and CouchDB support direct Javascript so that interfacing with this database will be much easier.
·       Node.js uses the V8 which always follows the development of the ECMAScript standard (the official standard name of JavaScript, but JavaScript is better known in its implementation), so there is no need for any concern that the browser does not support the features in Node.js.


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