Node.js

If you encounter the “ReferenceError: document is not defined” error in a Node.js or Next.js environment, there are steps you can take to resolve it. The document object is specific to browsers and is not accessible in server-side JavaScript environments. To learn more about the document object, refer to the detailed DOM Document Object Model guide. In the case of Node.js, there is no direct workaround for this issue. It is essential to identify the specific section of code where the document object is being accessed and investigate why it is being used in a server-side context....

If you are encountering the Module not found: Can't resolve 'fs' error in Next.js, don’t worry, there is a simple solution. This error typically occurs when you attempt to import Node.js modules within a Next.js page, but fail to use the imported method within the getStaticProps() function. To illustrate, let’s consider the following code snippet: import { getData } from '../lib/data' //... export async function getStaticProps() { const data = getData() return { props: { data, }, } } In this example, if we comment out the line const data = getData(), Next....

When working with images in Node, there may be occasions where you need to retrieve the width and height of an image. Whether the image is stored locally on your file system or sourced from the internet, you can easily obtain this information by following these steps: Identify the Image Location: To retrieve the dimensions of an image, you first need to determine its location on your file system. If the image is sourced from the internet, you can save it to a temporary folder on your system....

In a Node.js script, there are two common ways to reference the current folder: Using ./ Using __dirname Let’s explore each method and understand their differences. Using ./ The ./ notation refers to the current working directory in a Node.js script. It returns the same result as calling the function process.cwd(), which retrieves the current working directory. Initially, the current working directory is set to the path of the folder where you ran the Node command....

In this tutorial, I will guide you on how to set up a cron job that runs a Node.js app. Cron jobs are a time-based scheduler in Unix-like operating systems, which allow you to automate repeatable tasks. By following the steps below, you can configure a cron job to run your Node.js app at a specific time interval. Create a shell script file named run.sh with the following content: #!/bin/sh node app....

If you run a Node.js application on your own VPS, you’ll need a solution for obtaining SSL certificates. In this tutorial, we will guide you on how to set up HTTPS using the popular free solution Let’s Encrypt and Certbot. These are the steps we’ll follow: Install Certbot Generate the SSL certificate using Certbot Allow Express to serve static files Confirm the domain Obtain the certificate Setup the renewal Install Certbot To install Certbot on a Linux distribution that uses apt-get to manage packages, run the following commands:...

When writing JavaScript, some developers prefer not to use semicolons for a cleaner code. However, there are situations where we need to be careful, especially when using the require() function in Node.js to load external modules and files. In certain cases, you may encounter an error like this: TypeError: require(...) is not a function This error can be a bit confusing. Let’s go over how this error can occur. For example, let’s say you require a library and then need to execute some code at the root level using an immediately-invoked async function:...

Updating the dependencies of your Node project to their latest versions can improve your application’s security, performance, and compatibility. This can be done easily using npm. In this article, we will explore how to update all the npm dependencies specified in the package.json file to their latest available versions. When you install a package using npm install <packagename>, the latest version of the package is downloaded and added to the node_modules folder....

Find out how to properly upgrade the Node.js version you have installed. Node.js can be installed in multiple ways on a system, and the upgrade instructions depend on how you first installed it. Upgrading Node.js If You Installed it Using the Official Package The easiest way to install Node is to download the official package from the Node.js website. The official package contains an installer that will detect the existing version of Node....

Uploading files and processing them in the backend is a common functionality in web applications, such as uploading avatars or attachments. In this article, we will learn how to upload files to the server using JavaScript. Uploading Files Client-Side To enable file upload functionality in our web app, we start by adding an HTML file input element: <input type="file" id="fileUpload" /> Next, we register a change handler on the #fileUpload DOM element....