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⚙️ Express JS Installation and Environment Setup in Node JS

📌 How to Install Express?

📦 Installing Express JS

Express.js can be installed in multiple ways. The standard method adds it permanently to your project dependencies, while the temporary method installs it only for immediate use without saving it in package.json.

  • Step 1: Create a directory for your Express project → mkdir express_project
  • Step 2: Move into your project directory → cd express_project
  • Step 3: Initialize the project with npm init to create a package.json file
  • Step 4: Install Express and add it to dependencies → npm install express

📄 Example package.json File

{
  "name": "express_project",
  "version": "1.0.0",
  "description": "",
  "license": "ISC",
  "author": "",
  "type": "commonjs",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "dependencies": {
    "express": "^5.1.0"
  }
}

🧠 Installing Express JS (Temporarily)

To install Express temporarily without saving it to your dependencies list, use the following command: 

npm install express --no-save

🔍 Express JS Version Information and Requirements

  • Check your installed Node.js version using node -v
  • Express 4.x requires Node.js version 0.10 or higher
  • Express 5.x requires Node.js version 18 or higher
  • The latest stable version of Express.js is 5.0 (released on October 15, 2024)

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