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Deployment Basics

  • Deployment moves a Node.js application from development to production and ensures it runs smoothly for end users.

  • What is Deployment?

    Deployment is the process of moving your application from local machine to a live server so users can access it over the internet.


    Deployment Steps (High Level)

Build App
   ↓
Upload Code
   ↓
Install Dependencies
   ↓
Set Environment Variables
   ↓
Start Server

  • Deployment Goal

    • Application runs 24/7

    • Accessible via public URL

    • Connected to production database

    Deploying Node.js App

    Typical Platforms

    • Render

    • Railway

    • Vercel (Backend)

    • AWS / DigitalOcean

    Basic Requirements

    • package.json

    • start script

    • Environment variables

    • Production database

    Deployment Flow

GitHub Repo → Hosting Platform → Live App
  • 🔹 Common Deployment Errors

    Frequent Issues

    • Missing environment variables

    • Wrong PORT configuration

    • App crashes due to memory limits

    • Database connection failures

    Example Error

    Error: listen EADDRINUSE

    Cause: Port already in use.

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