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Thus, we learned how to create a Node.js project through command prompt, also the importance of package.json file required fields in package.json file and created our very first web server using HyperText Transfer Protocol module. The above scenario explains how Node.js handles concurrent client requests and operates on a single thread and does not need the creation of multiple threads.
![kill port in node js mac kill port in node js mac](https://pm2.keymetrics.io/images/pm2-monit.png)
It uses fewer threads so that it can use fewer resources. Node.js is used to build highly scalable, data-intensive applications. It operates in a non-blocking way and is event-driven. When the next request arrives, it again checks if that current request requires to query the database, if not then the thread takes the request ahead, processes it, and sends back the response to the client. The event loop, in turn, sends the response back to the client.ġ0. A thread is then assigned to look after the request, which takes the request forward, processes it, prepares the response, and sends it back to the Event Loop.ĩ. Internal Thread Pool consists of multiple threads.Ĩ. It then checks the thread availability in Internal Thread Pool. When a request is placed in the Event Queue, it starts processing that particular client request.ħ. Event Queue operates on a single thread only.Ħ. Meanwhile, for the first request which involves interaction with the database, the thread places that particular request in the Event Queue.ĥ. The thread then checks if the request requires querying the database or any complex operations, the thread does not wait for the database to return the value, instead, the thread is ready to serve another request.Ĥ. The client sends a request to the server.ģ. In Node.js, a single thread handles the incoming requests.Ģ. How Node.js Works?Īs we are aware, Node.js works asynchronously (non-blocking) let us understand the working process:ġ. Thus, the above image depicts the creation of our first web server that listens to port 5000. Step 6: After running the app.js file, you can check the output by switching into Google chrome browser and type: you will find the following output:
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Step 5: To execute the code snippet, use the following command as shown in the picture below:
![kill port in node js mac kill port in node js mac](https://www.codegrepper.com/codeimages/8080-already-in-use-mac.png)
What does the require() do – Require() is used to include the HTTP module.
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Why HTTP – HTTP module gives the privilege to create a web server that listens to server ports and sends a response back to the client.What is HTTP – HTTP module stands for HyperText Transfer Protocol which allows Node.js to transfer the information.Let us understand what the code is all about: webpages) to the client.Ĭreate an app.js file in your root directory.Ĭopy and paste the following code snippet. browsers) and sends back a response (e.g.
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Step 4: Let us now learn how to create a web serverĪ web server is a software application that handles the HTTP requests sent by HTTP clients (e.g. It represents all the information regarding the project and the packages with its version. The “package.json” is an essential file that is present in the root directory of the project. The two required fields in a “package.json” file are “name” and “version”. A “package.json” file lists all the packages that your project depends on.
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The full form for JSON is JavaScript Object Notation. Once the project is initialized upon using the command “npm init”, a “package.json” the file is created. The above three steps can be seen in the below screenshots: Step 3: To initialize the project, use the command