Node.js

To print to the console without adding a trailing newline, you can use the “process.stdout.write()” method. Example 1: Printing multiple strings on the same line process.stdout.write(“First string, “); process.stdout.write(“second string, “); process.stdout.write(“and third string.”); Output First string, second string, and third string. Example 2: Displaying a counter without a new line This example will display … Read more

NPM WARN package.json: No repository field is an informational message from npm (Node Package Manager) suggesting that the package.json file for your project does not have a repository field. This is not an error message, so don’t worry; it won’t prevent your package from working. The repository field in package.json is used to specify the … Read more

The npm list command provides an overview of the installed npm packages in your current project. The output can be extensive, especially if your project has many dependencies. List Globally Installed Packages To list npm user-installed packages globally in Node.js, you can use the “npm list -g –depth=0” command. Here: -g stands for “global”. It … Read more

To create a directory if it does not exist in Node.js, you can use the “fs.existsSync() and fs.mkdirSync()” methods. Here is the step-by-step guide to create a Directory If It Doesn’t Exist in Node.js. Import the fs and path modules. Define the directory path. Check if the directory exists and create it if it does … Read more

Base64 encoding is used when there is a need to encode binary data, especially when that data needs to be stored and transferred over media designed to deal with text. Base64 Encoding in Node.js To encode a string in Base64 in Node.js, you can use the Buffer.from().toString(‘base64’) method. Here is the step-by-step guide to encode … Read more

Unsupported engine node / NPM only when building in Docker error occurs when “there is a mismatch between the Node.js and npm versions specified in a project’s package.json and the versions installed in the Docker image.” To fix the Unsupported engine node / NPM only when building in Docker error, “remove package-lock.json before npm install … Read more

To send or pass command line arguments to an npm script, you can “use the — syntax followed by your arguments.” You can then access the arguments in the npm script via the process.argv array. Starting from npm version 2, the ability to pass arguments directly to scripts using the — separator was introduced. This syntax … Read more

Node Version Manager (NVM) is a popular tool to manage multiple Node.js versions on a single system. Here are five ways to set your default Node.js version using NVM: Using the nvm alias default command Using nvm use with .nvmrc Automatically switch Node version Using nvm install Using the NVM GUI Method 1: Using the … Read more

Here are five ways to check if a file exists in Node.js. Using fs.existsSync() (Synchronous) Using fs.promises.access() (Asynchronous with Promises) Using fs.access() with Callback (Asynchronous with Callback) Using “stat” methods Using “file” methods Method 1: Using fs.existsSync() (Synchronous) To check if a file exists synchronously in Node.js, use the “fs.existsSync()” method. The fs.existsSync() method returns … Read more

Here are two ways to read environment variables in Node.js. Using the process.env object Using a .env File with dotenv Method 1: Using the process.env object The simplest way to read environment variables in Node.js is to “use the process.env object.” Each environment variable is an attribute of the process.env object. To access a specific environment … Read more