Questions
Find answers to frequently asked development questions. For information about Better Stack products, explore our docs.
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To check for outdated packages and update them if needed, you can use the following npm commands: Check for Outdated Packages To check for outdated packages in your project, you can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...
Call async/await Functions in Parallel
To call async/await functions in parallel in JavaScript, you can use Promise.all to concurrently execute multiple asynchronous functions and wait for all of them to complete. Here's an example: // ...
How Can I Print a Circular Structure in a Json-like Format?
If you have an object with circular references in Node.js and you want to print it in a JSON-like format, you can use the util.inspect method from the built-in util module. The util.inspect method ...
How to Read Package Version in node.js Code?
To read the package version in Node.js code, you can use the require function to import the package.json file and access the version property. Here's an example: Assuming your project structure loo...
How to Run Multiple Npm Scripts in Parallel?
To run multiple npm scripts in parallel, you can use a task runner like concurrently or npm-run-all. These tools allow you to execute multiple commands concurrently, making it easy to run multiple ...
How to Access POST Form Fields in Express
In Express.js, you can access POST form fields using the req.body object. To do this, you need to use a middleware called body-parser (for Express versions 4.16.0 and below) or the built-in express...
Node.js: Printing to Console without a Trailing Newline?
In Node.js, you can print to the console without a trailing newline by using the process.stdout.write() method. Unlike console.log(), which automatically adds a newline character (\\n) at the end, ...
Why Does "npm install" Rewrite package-lock.json?
When you run the command npm install, npm installs the dependencies specified in your package.json file and generates or updates the package-lock.json file. The package-lock.json file is used to pr...
How to Check if a Tag Exists in Logstash?
To determine whether a tag exists within Logstash, you can use conditional statements. Here's how you can do that: if "yourtag" in [tags] { # Perform actions when the tag "yourtag" exists } This...
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