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General Published on: Fri Feb 10 2023
Let me introduce you to Node.js. But what exactly is Node.js?
What is NodeJS?
Why is NodeJS special?
Node executes reading/writing to the file system, network connections, and database lightning fast. It allows developers to build fast and highly scalable network applications capable of handling bulk amounts of simultaneous connections having high throughput.
Typically, Node.js uses a basic event-driven architecture. Everything executed on it, including every operation and call, is a series of asynchronous callbacks. This enables Node to run on a single thread, unlike other web technologies where a new thread is spawned for every client request. This makes it light-in-weight and forms the foundation of Node’s non-blocking I/O feature.
In Node.JS for functions callback hell, we can say goodbye with Promises of async and await libraries.
Node is a very High-Performance language. With Node, the traffic occurring on the servers and CPU utilization are also gets reduced. LinkedIn, the global networking site, moved from Ruby to Node to handle its mobile traffic and reduced the number of servers from 30 to 3, i.e., an almost 90% reduction.
We can also say Node.JS is very popular for its libraries. It has many libraries, making the developer’s work easier. Node has an NPM that manages all the libraries and packages. NPM, with its simple structure, helped the ecosystem of Node.js increase, and now the NPM registry hosts over 1,000,000 open source packages you can freely use.
How popular NodeJS is?
According to Stack Overflow’s 2021 developer survey, Node.js is the 6th most popular technology among programmers. Node.js is also a part of the MEAN, MERN, and MEVN stacks.
Now let’s understand each part of the Node.js architecture.
Image Source: Simplilearn.com
Parts of the Node.js Architecture:
Incoming requests – It can be categorized into two types, blocking (complex) or non-blocking (simple), depending on the tasks a user wants to perform in a web application.
Node.js Server – This is a server-side platform that receives requests from users, processes those requests, and responds accordingly.
Event Queue – Event Queue in a Node.js server stores incoming client requests and passes those requests one-by-one into the Event Loop
Thread Pool – This pool contains all the threads available for performing some tasks required by clients
Event Loop – Event Loop processes the requests received and then returns the responses to corresponding clients.
External Resources: External resources are needed to handle blocked requests from clients. These resources can be for computation, data storage, etc.
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