A list of the ’10 of the best Node.js libraries used by the developers’ to make the web development extremely convenient.

1. Mocha.js

Mocha.js is a testing framework which enables us to test both in the console as well as in the browser. It is generally used a unit testing tool, but can also be used as an integration testing tool too. The big advantage of Mocha.js is that it works well with other libraries like Chai, Should.js, and Sinon.

2. Express.js

Express.js is one of the most vital tools for developing effective mobile and web applications. It is the minimal framework for web development using Node.js. However, its functions are pretty massive. It is possible to build a whole website just using Node.js and Express.js. The combination enables us to build software on the server-side in which Node.js is essential, while Express.js helps to publish the app on our website. It offers a diverse variety of features like database integration, simplified multiple routing, template engines.

3. Passport.js

Passport.js is an authentication tool for Node.js. It provides us a wide range of over 300 different ways for authenticating our website or app. Simplifies the authorization level and lets us provide the customer the authentication methods that he desires. This includes providing the user the login through the standard username-password procedure or login via Google, Facebook or Twitter. It is easily compatible with any Express.js app.

4. Socket.io

Socket.io is the library that enables cross-browser bi-directional communication between two web servers. It is extremely proficient in developing real-time apps across all web browsers and most mobile devices. It is one of the most rapid and most reliable real-time engines. It provides better debugging, real-time analytics with logs and charts, streamlined API, binary support and improved scalability among many other excellent features. This is the library implemented in chat apps- where the data loads and refreshes automatically. It is also used in sports websites which have live score features, where the score loads automatically when the data is entered on the server-side. It’s loved by massive corporate companies like Microsoft, Google, Trello and also by the upcoming start-ups.

5. Meteor.js

Meteor.js is the framework that is implemented for rapid prototyping of the JavaScript apps. It is also used in making cross-platform codes i.e. Web, Android, iOS. It works flawlessly with Node.js when integrated with MongoDB. It can be used with any JavaScript User Interface widget library. The major disadvantage is that hough it works efficiently for prototyping apps, it is not the best solution to maintain the already finished ones.

6. Math.js

As the name suggests, Math.js is the extensible standard library containing all the mathematical functions that are provided by JavaScript and Node.js. It is very powerful and relatively easy to use.  It provides solutions to work with huge numbers, complex numbers, and matrices amongst various others.

7. Mongoose

Mongoose is an object data modeling (ODM) library that integrates both MongoDB and Node.js. It provides a thorough modeling environment for your data. It is extremely flexible and enforces structures in the data when needed.

8. Protractor.js

Protractor.js is an end-to-end testing framework i.e. it is used for functional testing in AngularJS applications. It is also compatible with the Node.js library. It runs tests with our applications running in the actual browser by interacting with it like a user would.

9. Async.js

The processing and execution technique of JavaScript is a little complicated, and it follows a certainly predetermined algorithm. The Async.js is a library function that is used to synchronize the data that is being executed. The async module implements a function called series() which lets us control the flow of processing and execution. This function takes an array as an argument and executes in the order as specified in the array. It can also be used directly in the browser, though it was originally designed to work only with the Node.js.

10. Moment

Moment is a JavaScript date library that is used for validating, converting, manipulating and formatting dates. Moment was primarily designed to work in both Node.js and in the web browser. Hence, the codes and unit tests run must work in both these environments.

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