Questions
Find answers to frequently asked development questions. For information about Better Stack products, explore our docs.
How to read environment variables in Node.js
In Node.js, you can read environmental variables using the process.env object. This object provides access to the user environment, including environment variables. Here's a simple example of how y...
How to use multiple node versions on the same machine?
There are several ways to manage multiple Node.js versions on the same machine. Here are two popular tools for achieving this: NVM (Node Version Manager): NVM is a widely used tool for managing mul...
What is the purpose of Node.js module.exports and how do you use it?
In Node.js, module.exports is a special object that is used to define what a module exports as its public interface. It is used to expose functionality from one module (file) to another module, all...
How to get `GET` variables in Express.js on Node.js?
In Express.js, you can access GET (query string) variables using the req.query object. The req.query object contains key-value pairs of the query string parameters in a GET request. Here's an examp...
How do you get a list of the names of all files present in a directory in Node.js?
In Node.js, you can use the fs (file system) module to get a list of file names in a directory. Here's an example using the fs.readdir function: const fs = require('fs'); const directoryPath = '/pa...
How do I debug Node.js applications?
Debugging Node.js applications can be done using various tools and techniques. Here are some common approaches to debug Node.js applications: console.log The simplest form of debugging is using con...
Is there a map function for objects in Node.js?
In JavaScript, the map function is typically used with arrays to transform each element of the array based on a provided callback function. If you want to achieve a similar result with objects, you...
How to write to files in Node.js?
In Node.js, you can use the fs (file system) module to read from and write to files. Here's a basic example of how to write and read files in Node.js using callbacks: const fs = require('fs'); // W...
How can I update Node.js and NPM to their latest versions?
There are several ways to update Node.js to its latest version. Here are three methods: Updating Node.js Using NPM You can use NPM to update Node.js by installing the n package, which will be used ...
How to decide when to use Node.js?
Node.js is a powerful, JavaScript-based runtime environment that has shaped the modern web landscape, enabling developers to build fast, scalable, and efficient web applications. To Node.js or not ...
How to exit in Node.js
Exiting a Node.js application is simple and can be done using the process.exit() method. This method exits from the current Node.js process and takes an exit code, which is an integer. The exit cod...
How can I update each dependency in package.json to the latest version?
To update each dependency in package.json to the latest version, you can use the npm-check-updates package. Here are the steps: Install the npm-check-updates package globally by running the followi...
What's the difference between dependencies, devDependencies, and peerDependencies in NPM package.json file?
When you create a new Node.js project, you’ll notice a package.json file in the root directory. This file contains metadata about your project, including the dependencies required to run it. There ...
How to find the version of an installed npm package?
To find the version of an installed npm package, you can use the following commands: To see the version of an installed Node.js or npm package, run npm list <package-name>. To see the latest versio...
How do I pass command line arguments to a Node.js program and receive them?
In Node.js, you can pass command line arguments to your script the same as you would for any other command line application. Simply type your arguments after the script path separated with a space ...
What is the --save option for npm install?
The --save option for npm install was once used to add the installed module into the dependencies section of your package.json file automatically. However, from npm version 5.0.0 this is no longer...
Using async/await with a forEach loop?
In Node.js, the forEach loop is not compatible with the async/await syntax as it does not wait for promises. But fear not, as there are two alternatives: The for(… of …) loop If you would like to h...
What’s the Difference between Tilde(~) and Caret(^) in package.json?
In a package.json file, the tilde (~) and caret (^) symbols are used to specify version ranges for your project’s dependencies. They help you control which versions of packages can your projects us...
How to Read Textbox Values in Playwright Tests
To read textbox values in Playwright, you can use the inputValue() method on a locator pointing to the textbox. Here's a step-by-step guide:
How to Disable JavaScript in Playwright Tests
Playwright enables JavaScript by default in all browsers, but you can easily disable it per test or even globally using a couple of configuration options
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