Beginner's Guide To Node.js



Node.js is a free and open-source server environment that may be used on a variety of platforms. Node.js also provides access to a wide library of JavaScript modules, which greatly facilitates the building of Node.js web applications. It allows developers to utilise JavaScript to create command-line tools and server-side scripting, which involves running scripts on the server to generate dynamic web page content before sending the page to the user's browser.In 2009, Ryan Dahl created the Node.js framework.


Due to its single-threaded nature, Node.js is best suited for non-blocking, event-driven servers. It was built with real-time, push-based architectures in mind and is utilised for standard web sites and back-end API applications. It is not only effective at what it does, but it is also popular. It also has a low tendency to cause serious compatibility issues between versions.


In today's world, Node.js offers a variety of purposes. Node.js may be used to create a wide range of apps, from backend management for social media marketing to single-page applications. A few examples are chat streaming, data streaming, and IoT applications. It is used in developing applications of the most used apps too. Amazon, eBay, Reddit, Netflix, LinkedIn, Tumblr, and PayPal are just a few of the organizations that have implemented Node.js.


In the video below, Nehru Permulla demonstrates how to instal Node.js.



Modules

Modules are encapsulated code blocks in Node.js that communicate with an external application based on their relevant functionality. Modules might be a single file or a group of files and folders. Because of its reusability and ability to break down a difficult piece of code into manageable bits, programmers are heavily reliant on modules.

Node.js includes three types of modules:


  1. Core Modules

  2. Local Modules

  3. Third Party Modules


Core Modules: Node.js is a really lightweight framework. Its basic minimal functionalities are included in the core components. These core modules are compiled into the Node.js binary distribution and loaded when the process starts. However, before you can utilise the core module in your application, you must first import it.

Core modules include http, assert, fs, path, process, os, query string, and url.


Local Modules: In a Node.js application, local modules are built locally. These modules split the application's many functionalities into independent files and folders. It can also be packaged and distributed via NPM for usage by the Node.js community.


Third Party Modules: Third-party modules are modules that can be downloaded via the Node Package Manager website (NPM). These modules can be installed locally or globally in the project folder. Mongoose, express, angular, and react are some of the most popular third-party modules.


HTTP Requests Using Node.js


The request method is included in Node's http module. This module takes over much of the low-level operations like creating servers, receiving requests, sending responses, and keeping connections open. The request implementation, like most fundamental implementations, is more verbose and difficult to deal with than many libraries' abstractions.


The following video is a tutorial for learning HTTP Requests with Node.js for beginners.



Working With Express and Node

The most popular Node web framework is Express, which also serves as the foundation for a number of other prominent Node web frameworks. It gives numerous fundamental mechanisms. It writes for requests with a variety of HTTP verbs and URL paths (routes). It can also configure standard web application parameters such as the connection port and the location of templates used to display the response. Additionally, It is now the de facto server framework for node.js. The MEAN stack includes Express as a backend component. MEAN is a free and open-source JavaScript software stack that includes the following components for creating dynamic web pages and online applications: MongoDB, Express.js, Angular.js and Node.js.


Learn to work with express and node with Newton School Launchpad in the video below



Intro To MongoDB

MongoDB is a document-oriented database management system (DBMS) that runs on a variety of platforms. MongoDB is a NoSQL database, which implies it doesn't rely on SQL to conduct database operations.MongoDB employs documents in a JSON-like format known as BSON, which is the binary eNode and MongoDB work well together, in part because MongoDB has a JavaScript engine built in, which is capable of processing JSON objects. Mongo has its own storage system because it is a NoSQL database. The database structure is comprised of the following constructs:


Database: It's a container to hold a bunch of collections.


Collection: It consists of a number of documents. A table in a SQL database is analogous to this. A collection, unlike a SQL database, does not have a predefined structure or data types.


Documents: It can be defined as a JSON-like object. This is equivalent to a SQL database row. A JSON object can also have child objects, an array, and other data.


_id: Every document must have an id field that is unique. It distinguishes one document from another, allowing us to recognise each one separately. If you don't give a value for this field, MongoDB will assign a random value to it.


CRUD Operations Using Mongoose


CRUD stands for Create, Read, Update and Delete. The data stored in MongoDB can be operated using CRUD. Mongoose is a package that acts as a bridge between the NodeJS application and the MongoDB database server. It's an Object Document Mapper (ODM) that lets us create objects with a strongly-typed schema and map them to MongoDB documents. All CRUD operations are supported by Mongoose.


Learn how to implement CRUD from an expert in the video below



Learn Node.Js with the industry expert Nehru Perumalla, a tech enthusiast and a software engineer at Value Momentum. All you have to do is enroll in Newton School Launchpad for FREE. Learn Node.js by working on exciting projects and get a certificate at the end of the course. Join Newton School now to be a rockstar developer!

https://www.newtonschool.co/launchpad