Node.js is an open-source, cross-platform JavaScript runtime environment. Node.js is often used to build real-time web applications that are highly scalable. It can also be used to build command-line tools and server-side web applications. Node.js is based on the V8 JavaScript engine, also used by Google Chrome.
ReferenceError: fetch is not defined error occurs when trying to “use the fetch() function in a Node.js environment, but fetch is not natively available in Node.js.” In browsers, the fetch API provides a simple way to make network requests. But in Node.js, it is not available. Reproduce the error const fetch = require(‘node-fetch’); fetch(‘https://askjavascript.com’) .then(response … Read more
The error: cannot find module ‘express’ occurs when the “Express.js module is not installed in your project, or there’s an issue with your node_modules directory.” How to fix the error The easiest way to fix the error is to install express in your project using this command: npm install express –save. This command will install Express … Read more
To fix the cannot find module ‘fs/promises’ error in Node.js, upgrade or download the latest stable Node version. This should have the ‘fs/promises’ module, which will resolve the issue. To check your Node.js version, run this command: node -v You can see that I am already using the latest version of Node.js. If you are … Read more
Error: cannot find module ‘node:events’ occur in Node.js when you try to “use a built-in module using the node: prefix, which was introduced in Node.js version 14.x for ES modules.” There are two main reasons for the error. When running an older version of Node.js that doesn’t support the “node:” prefix. When you have misconfigured … Read more
The nodemon clean exit – waiting for changes before restart message suggests that “nodemon has detected that your Node.js application has stopped without errors.” It is now in a waiting state, monitoring your files for any changes. It will restart your application once it detects a change in any of the monitored files. Nodemon is … Read more
Yarn requires node.js 4.0 or higher to be installed warning occurs when you try to install yarn package manager but use Node.js version below version 4.0. To fix the yarn requires node.js 4.0 or higher to be installed error, “install the latest version of Node.js or upgrade your current Node.js version to the latest version.” … Read more
Webpack: Conflicting values for ‘process.env.NODE_ENV’ error occurs when you “configure DefinePlugin incorrectly or try to reassign process.env.NODE_ENV when instantiating the plugin.” DefinePlugin allows you to define global constants that can be configured at compile time. It is specifically helpful for having development-only code or API endpoints based on the build environment. Reproduce the error const … Read more
Error: listen EADDRINUSE: address already in use occurs in Node.js when you “try to restart a Node application, and the previous one did not shut down properly.” How to fix the error? Here are some steps to diagnose and fix the issue. Check Running Processes You can use the below command to see if any … Read more
Here are three ways to read a file line by line in Node.js. Using readline Using line-reader Using n-readlines For this tutorial, we will read the data.txt file line by line, which is in the root of my project folder. J Robert Oppenheimer and Albert Einstien hello world Jawaan Nun 2 Method 1: Using readline … Read more
ReferenceError: primordials is not defined error occurs in Node.js when you are “using older versions of certain Node.js modules like gulp with newer versions of Node.js, specifically Node.js v12 and later.” The main reason for the error is that gulp v3 doesn’t work (as of now) under node v12 because it depends on graceful-fs@^3.0.0, which … Read more