Node.js

Understanding the Node.js Event Loop: Phases, Microtasks, and Blocking Explained The event loop is the heart of Node.js. Learn its phases, how microtasks fit in, and how to avoid blocking it so your app stays fast and responsive.
Async/Await vs Promises vs Callbacks: Patterns and Pitfalls in Node.js Callbacks, Promises and async/await all handle asynchronous work in Node.js. Learn how they differ, when to use each, and the pitfalls to avoid.
process.nextTick vs setImmediate vs setTimeout: Execution Order in Node.js Confused by Node.js timing functions? Learn how process.nextTick, setImmediate and setTimeout differ, when each runs, and how to use them correctly.
Node.js Streams Explained: Processing Large Data Without Running Out of Memory Streams let Node.js process huge files and data flows in chunks. Learn the four stream types, how piping works, and why streams beat loading everything into memory.
How to Handle Backpressure in Node.js Streams Backpressure stops a fast data source from overwhelming a slow destination. Learn what backpressure is and how to handle it correctly in Node.js streams.
How to Scale Node.js Across CPU Cores with the Cluster Module A single Node.js process uses one CPU core. Learn how the cluster module forks workers to use every core and handle more traffic on your server.
How to Use Worker Threads for CPU-Intensive Tasks in Node.js CPU-heavy work blocks the Node.js event loop. Learn how worker threads run that work in parallel so your main thread stays responsive to requests.
How to Profile and Fix Memory Leaks in a Node.js Application A Node.js memory leak slowly crashes your app. Learn how to spot, profile and fix leaks using heap snapshots and by tracking down the common causes.
How to Add Caching to a Node.js App with Redis and In-Memory Stores Caching cuts database load and speeds up responses. Learn how to add in-memory and Redis caching to a Node.js app, and when to use each.
How to Benchmark and Load-Test a Node.js API Will your API hold up under traffic? Learn how to benchmark and load-test a Node.js API, read the results, and find the bottlenecks before your users do.
How to Optimize Database Access in Node.js with Connection Pooling Opening a new database connection per request is slow. Learn how connection pooling reuses connections to make your Node.js app faster and more stable.
How to Debug Node.js with the Inspector and Chrome DevTools Stop debugging with console.log. Learn how to use the built-in Node.js inspector with Chrome DevTools to set breakpoints, step through code and inspect state.
How to Diagnose and Fix “JavaScript heap out of memory” Errors in Node.js Node.js crashing with “heap out of memory”? Learn what it means, how to raise the limit as a stopgap, and how to find the real memory problem behind it.
How to Capture and Analyze Node.js Heap Snapshots and CPU Profiles Heap snapshots and CPU profiles reveal exactly where Node.js spends memory and time. Learn how to capture and read them to find leaks and bottlenecks.
How to Handle Uncaught Exceptions and Unhandled Promise Rejections in Node.js An unhandled error can crash your Node.js app. Learn how to handle uncaught exceptions and unhandled promise rejections safely, and why you should still restart.
How to Set Up Structured Logging in Node.js with Pino or Winston console.log doesn’t scale. Learn how to set up structured logging in Node.js with Pino or Winston for searchable, level-based logs you can actually use.
How to Run Node.js in Production with PM2: Clustering and Zero-Downtime Reloads PM2 keeps Node.js running in production. Learn how to use PM2 for clustering across CPU cores, zero-downtime reloads, auto-restart and boot persistence.
How to Set Up Nginx as a Reverse Proxy for a Node.js App Don’t expose Node.js directly on port 3000. Learn how to put Nginx in front as a reverse proxy to handle ports, SSL and static files cleanly.
How to Run a Node.js App as a systemd Service on Linux Want your Node.js app to start on boot and restart on failure without PM2? Learn how to run it as a systemd service on Linux with a simple unit file.
How to Deploy a Node.js Application with Docker on a VPS Docker packages your Node.js app with everything it needs to run identically anywhere. Learn how to containerise a Node app and deploy it on a VPS.
How to Set Up CI/CD for a Node.js App with GitHub Actions Automate testing and deployment. Learn how to set up a CI/CD pipeline for your Node.js app with GitHub Actions so every push is tested and shipped safely.
How to Implement Graceful Shutdown in a Node.js Server Killing a Node.js process mid-request drops connections and corrupts work. Learn how to implement graceful shutdown so in-flight requests finish cleanly.
How to Monitor a Production Node.js App with Health Checks and Metrics You can’t fix what you can’t see. Learn how to monitor a production Node.js app with health checks, key metrics and alerts so you catch problems early.
Node.js Security Best Practices for Production Applications Shipping a Node.js app? Learn the essential security best practices — dependencies, headers, input validation, secrets and more — to protect it in production.
How to Prevent Prototype Pollution, Injection, and SSRF in Node.js Learn how three common Node.js vulnerabilities — prototype pollution, injection, and SSRF — work, and the practical defences that keep your app safe.
How to Audit and Fix Vulnerable npm Dependencies Your npm packages can carry known vulnerabilities. Learn how to audit dependencies with npm audit, fix them safely, and keep your Node.js app secure over time.
How to Manage Environment Variables and Secrets Securely in Node.js Hard-coding API keys is a security risk. Learn how to manage environment variables and secrets in Node.js safely, keeping them out of your code and repository.
How to Build a Production-Ready REST API with Express: Structure and Error Handling Learn how to structure a production Express REST API — routing, middleware, validation and centralised error handling — so it stays maintainable and robust.
How to Scale WebSockets and Socket.IO Across Multiple Node.js Instances WebSockets don’t scale like normal requests. Learn how to run Socket.IO across multiple Node.js instances using a Redis adapter and sticky sessions.
How to Build a Background Job Queue in Node.js with BullMQ and Redis Slow tasks shouldn’t block your requests. Learn how to build a background job queue in Node.js with BullMQ and Redis to process work reliably out-of-band.
How to Choose and Change Your Node.js Version in cPanel Need a specific Node.js version on shared hosting? Learn how to choose and change the Node.js version for your app in cPanel's Setup Node.js App tool.
How to Install npm Packages for a Node.js App in cPanel Learn how to install your Node.js app’s npm packages on cPanel shared hosting — using the Run NPM Install button and the app’s virtual environment over SSH.
How to Set the Startup File and Application Root in cPanel Node.js Your Node.js app won’t run without the right startup file and application root. Learn what each setting means and how to configure them correctly in cPanel.
How to Set Environment Variables for a Node.js App in cPanel Keep secrets and config out of your code. Learn how to add environment variables for your Node.js app in cPanel’s Setup Node.js App tool.
How to Restart a Node.js App in cPanel (and Why touch tmp/restart.txt Works) Changes not taking effect? Learn how to restart your Node.js app in cPanel using the Restart button or by creating tmp/restart.txt, and why that file works.
What Is Phusion Passenger and How Does cPanel Run Node.js? Ever wondered how cPanel actually runs your Node.js app? Learn what Phusion Passenger is, how it manages your app, and what that means for how you build it.
How to Route a Node.js App to a Subdomain in cPanel Want your Node.js app on app.yourdomain.com? Learn how to create a subdomain and point your Node.js application to it in cPanel.
Running a Node.js App in a Subfolder vs a Subdomain on cPanel Should your Node.js app live on a subdomain or in a subfolder? Learn the pros, cons and practical differences on cPanel shared hosting.
How to Deploy an Express.js App on cPanel Shared Hosting Ready to go live? Learn how to deploy an Express.js app on cPanel shared hosting step by step using the Setup Node.js App tool and Passenger.
How to Deploy a Next.js App on cPanel Shared Hosting Deploying Next.js on shared hosting has some quirks. Learn how to build and run a Next.js app on cPanel, and when a static export is the simpler option.
How to Host a React Front-End with a Node.js Backend on cPanel Got a React app and a Node API? Learn how to host the React front-end as static files and run the Node.js backend on cPanel, and how to connect them.
How to Deploy a Node.js App from GitHub Using cPanel’s Git Tool Deploy straight from your repository. Learn how to use cPanel’s Git Version Control to clone and update your Node.js app from GitHub, then run it with Passenger.
How to Serve Static Files from a Node.js App on cPanel Images, CSS and JS slowing your app? Learn how to serve static files efficiently from a Node.js app on cPanel, and when to let the web server handle them.
How to Connect a cPanel Node.js App to a MySQL Database Learn how to connect your Node.js app to a MySQL database on cPanel — create the database and user, then connect from Node using the mysql2 driver and a pool.
How to Connect a cPanel Node.js App to a Cloud MongoDB (Atlas) Shared hosting rarely has MongoDB installed. Learn how to connect your cPanel Node.js app to a free cloud MongoDB database with MongoDB Atlas.
How to Fix “Application Failed to Start” in cPanel Node.js Seeing “application failed to start” in cPanel? Learn the common causes — port, startup file, dependencies — and how to fix a Node.js app that won’t launch.
How to View Node.js Application Logs and Errors in cPanel When your Node.js app misbehaves, the logs have the answer. Learn where to find your app’s logs and errors on cPanel and how to use them to debug.
How to Fix npm Install and Build Failures on cPanel npm install or build failing on shared hosting? Learn the common causes — memory limits, native modules, wrong Node version — and how to fix them on cPanel.
How to Fix a Node.js App That Keeps Stopping on Shared Hosting Node.js app keeps stopping on shared hosting? Learn why it happens — idle timeouts, resource limits, crashes — and what you can and can’t fix on shared plans.
How to Work Within Memory and Process Limits for Node.js on Shared Hosting Shared hosting limits memory and processes. Learn how to build a lean Node.js app that stays within those limits — and how to know when you’ve outgrown them.
How to Set Up a Node.js Application on Webuzo Running Webuzo hosting? Learn how to set up a Node.js application on Webuzo, install a Node version, upload your app, and get it running behind OpenLiteSpeed.
How to Install and Manage Node.js Versions on Webuzo Need a specific Node.js version on Webuzo? Learn how to install, switch and manage Node.js versions from the Webuzo panel and over SSH.
How to Deploy an Express.js App on Webuzo Learn how to deploy an Express.js app on Webuzo — upload your code, run it with PM2, and serve it through OpenLiteSpeed as a reverse proxy over HTTPS.
How to Deploy a Next.js App on Webuzo with a Reverse Proxy Learn how to deploy a Next.js app on Webuzo — build it, run the production server with PM2, and serve it through OpenLiteSpeed as a reverse proxy over HTTPS.
How to Run a Node.js App Behind OpenLiteSpeed on Webuzo Webuzo uses OpenLiteSpeed as its web server. Learn how to set it up as a reverse proxy so your domain serves your Node.js app running on a local port.
How to Keep a Node.js App Running on Webuzo with PM2 Your Node.js app stops when you close SSH? Learn how to use PM2 on Webuzo to keep it running in the background, restart on crashes, and survive reboots.
How to Connect a Webuzo Node.js App to MySQL Learn how to connect your Webuzo-hosted Node.js app to a MySQL database — create the database and user in Webuzo, then connect from Node with a pool over localhost.
How to Set Environment Variables for a Node.js App on Webuzo Keep secrets out of your code on Webuzo. Learn how to set environment variables for your Node.js app — via PM2, an env file, or the shell — and read them safely.
How to View Logs and Fix a Failing Node.js App on Webuzo Node.js app failing on Webuzo? Learn where to find your app, PM2 and OpenLiteSpeed logs, and how to work through the common causes of a failing app.
How to Enable Free SSL (HTTPS) for a Node.js App on Webuzo Secure your Webuzo Node.js app with HTTPS. Learn how to enable a free Let’s Encrypt SSL certificate and serve your app securely through OpenLiteSpeed.
How to Deploy a Node.js App with PM2 in cPanel Running a Node.js app on cPanel? Learn how the Node.js app tool works, when to use PM2 over SSH, and how to keep your app running reliably.
How to Fix Node.js Port and 502 Errors in cPanel Node.js app throwing 502 or port errors on cPanel? Learn why binding to the wrong port breaks Passenger and how to configure your app correctly.
How to Fix the Node.js error: “Cannot GET” URL Sometimes when using Node.js for your application(s) you may receive an error about the app being unable to “GET a URL”. This is because of how Passenger uses Application URLs in cPanel, which can be…
How to Set up Node.js Application in cPanel In this tutorial, you will learn how to easily set up Node.js applications from the cPanel graphical interface or by entering commands in the hosting terminal. You’ll be able to host your…