Questions
Find answers to frequently asked development questions. For information about Better Stack products, explore our docs.
Error: EACCES: permission denied, access '/usr/local/lib/node_modules'
The error Error: EACCES: permission denied, access '/usr/local/lib/node_modules' typically occurs when you try to install global npm packages without the necessary permissions. This can happen if y...
How to Use Executables from a Package Installed Locally in node_modules?
When you install a package locally using npm or yarn, the package's executables (if any) are typically added to the node_modules/.bin directory. You can use these executables directly from the comm...
How Can I Specify the Required node.js Version in package.json?
You can specify the required Node.js version in the engines field of your package.json file. This field is used to specify the runtime that your project requires. Here's an example: { "name": "yo...
How to Update node.js?
To update Node.js to the latest version, you can use a version manager like NVM (Node Version Manager) or download and install the latest version directly from the official Node.js website. Using N...
How to Sleep in node.js?
In Node.js, there is no built-in sleep function like in some other programming languages. However, you can use the setTimeout function to simulate a sleep-like behavior. Here's a simple example: fu...
How to Process POST Data in node.js?
In Node.js, you can process POST data in different ways depending on the framework or library you are using. I'll provide examples for both native HTTP and using the popular Express.js framework. N...
How to Append to a File in Node?
In Node.js, you can append data to a file using the fs (File System) module. The fs.appendFile function is specifically designed for this purpose. Here's an example: const fs = require('fs'); const...
How to Fix Error: Request Entity Too Large
The "Error: request entity too large" typically occurs when the payload of a HTTP request exceeds the size limit set by the server. This can happen in various contexts, such as when handling file u...
How to Remove File in node.js
In Node.js, you can remove (delete) a file using the built-in fs (File System) module. The fs module provides the unlink function for this purpose. Here's an example: const fs = require('fs'); cons...
Nvm Alternatives
Node Version Manager (NVM) is a popular tool for managing multiple versions of Node.js on a single machine. If you're looking for alternatives to NVM, there are a few other tools and version manage...
Execute a Command Line Binary with node.js
You can execute a command line binary in Node.js using the child_process module. Here's a simple example: const { exec } = require('child_process'); const binaryPath = '/path/to/your/binary'; // Re...
How Do I Test a Single File Using Jest?
To test a single file using Jest, you can follow these steps: Install Jest If you haven't installed Jest yet, you can install it using npm: npm install --save-dev jest Create a Jest Configuration (...
How Do I Test a Single File Using Node Built-in Test Runner?
Node.js itself does not come with a built-in test runner. However, you can use the built-in assert module for simple assertion-based tests. If you want a more feature-rich test runner, you might co...
Using node.js, How Do I Read a Json File into (Server) Memory?
In Node.js, you can read a JSON file into memory using the built-in fs (File System) module to read the file content and then use JSON.parse to parse the JSON data. Here's a simple example: const f...
How Do I Resolve “Cannot Find Module” Error Using node.js?
The "Cannot find module" error in Node.js typically occurs when you try to import or require a module that does not exist or cannot be found by Node.js in the specified path. Here are steps you can...
How Do You Prevent Install of “devDependencies” npm Modules for node.js (package.json)?
When using npm install in Node.js, by default, both regular dependencies and devDependencies specified in the package.json file are installed. If you want to install only production dependencies (e...
How to Fix: EADDRINUSE, Address already in use - Kill server
The "EADDRINUSE, Address already in use" error occurs when you try to start a server on a port that is already in use by another process. To fix this issue, you can take the following steps: Identi...
Npm Check and Update Package If Needed
To check for outdated packages and update them if needed, you can use the following npm commands: Check for Outdated Packages To check for outdated packages in your project, you can use the npm out...
module.exports vs exports in Node.js
In Node.js, both module.exports and exports are used to define the exports of a module, but there are differences in how they can be used. module.exports module.exports is the actual object that is...
How Do I Convert an Existing Callback API to Promises?
Converting an existing callback-based API to use promises in JavaScript involves wrapping the asynchronous functions with a Promise. Here's a step-by-step guide: Let's assume you have an existing c...
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