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Know more about the Node. JS and its Frameworks

One can find almost no area where the computer is not used in this age. It is an important part of social life as well as personal. This magnificent device also needs to have help from various software, applications, and programs that are created by experts in the field. The Node.Js is one among such terms that are important for the creation of a program. Node.js is an environment of a JavaScript runtime. The node JavaScript run-time environment consists of everything a user may need while executing a JavaScript written program.

Node.js originated when the actual JavaScript developers extended it forms something that could have only been run in a browser to something that would run in a device as a standalone app.

A lot can be done with a JavaScript than just developing an interactive website. JavaScript has the ability to various things that some scripting languages like Python could do.

Both the browser and Node JavaScript run on JavaScript runtime V8 engine. This engine takes the JS code and converts it a much faster machine code. Machine code is a low-level code which a computer runs without needing to interpret it.

Why Node.js?

Node.js uses a non-blocking I/O model which is event-driven, hence making it efficient and lightweight. The ecosystem of Node.js, NPM, is the largest open source library ecosystem in the world.

As discussed already, “Node.js” is a JavaScript runtime which has been built on a Chrome V8 JavaScript Engine. Now here we ought to understand the two following lines that made node.js so popular.

 

  1. I/O means input/output. It can be anything that ranges from writing/reading local files to making of an HTTP request into an API.
  2. I/O consumes time, thus, blocks other functions.

 

Let us consider a scenario where a backend database is requested for the particulars of user 1 and user 2 and then let us print it on the console or a screen. This request takes time to respond, however, both the user data requests will be carried out individually and at the same time.

 

Why does Node.js testing matter?

For some of the obvious reasons, it is important to go through a Node JS Test. Without testing, bugs can sneak into the system where fixing and repairing can be difficult and costly. Automatic testing significantly increases the test coverage and also helps in long-term cost reduction.

 

Tools and frameworks

Here is a brief review of various popular tools with an overview of how these tools can be integrated collectively to form an inclusive Node JS Test environment.

Frameworks that can be used:

While there are various testing tools available and a few new ones that are still under development, the following list expresses the uses of these tools:

  • Mocha

Mocha is a great framework for testing, allows the use of asynchronous and promises with Babel or TypeScript. It handles the test execution a user creates, catches the assertion errors (if any), and pretty-prints these into the console.

  • Chai

Chai is a proclamation library that lets a user use natural language construct while developing the tests. Chai is tremendously helpful as a lot of assertion libraries may be rather cryptic.

  • Mockery

It is a small NPM module which allows a user to substitute a mock test without having any modification done to the production code. Just with the creation of a module or a mock function and then registering it with the mockery, Node.js injects these mocks wherever in the code a require statement may be used.

  • Jenkins

This is a continuous integration system which can hook into a user’s version control, e.g. git and then automatically executes mocha whenever a commit occurs. This concludes that the product was tested each time during the occurrence of changes.

  • JS

It is an impartial testing framework for a JavaScript. The best thing about it is that it can work with any available framework. It supports spies, mocks, and stubs. It may as well support most of the browsers and also runs on a Node.js using the server.

  • js

The Express.js framework is a must-use simple Node.js web application framework. The express.js and node.js combination enables the user to develop software with JavaScript being on the server side. Expressing in a short manner, it can be said that a whole website can be built with these two things, Building server-side of the app, using the Node.js and using Express.js for publishing the apps on a website.

  • WebStorm IDE

Webstorm IDE is a great IDE JavaScript. It is lightweight and has everything a developer needs for building Node.js apps on the client’s side as well as on the Tracking (using built-in-tool spy.js), debugging, unit testing (with easy to assimilate Mocha.js or Karma).

  • js

The Passport.js framework is an endorsing middleware for Node.js. It gives a user a choice of more than three hundred ways of validating an application containing password and username model, login via Google, Facebook, Twitter etc., and other web services too. It is really easy to imply with any Exspress.js app.

  • io

This is a framework that enables an event based bi-directional communications in real-time. It does not matter what platform or which device is being used, it works superbly on anything.

The Socket.io package contains a real-time analysis with logs, charts, and counters. It is perfect for the applications used for chats and is loved by small start-ups and big companies like Zendesk, Trello, Microsoft, etc.

  • js

This is a promise library which will help a user to control his/her asynchronous code. It can be separated by a code in various files without a problem. This is a must-have framework if a user cares about the quality of code. A developer may also try the Q as an alternative to the BlueBird.js framework.

  • PM2

This is a process managing framework for Node.js apps. It is quite simple to use and also provides a lot of useful inbuilt features such as watch mode or load balancer.

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