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# Initialize a new project (interactive): npm init # Initialize with defaults (skips questions): npm init -y # Install a package and save to dependencies: npm install express # Install a dev-only package: npm install --save-dev nodemon # Install a specific version: npm install lodash@4.17.21 # Install all dependencies from package.json: npm install # Uninstall a package: npm uninstall express # List installed packages: npm list --depth=0 # package.json structure: # { # "name": "my-app", # "version": "1.0.0", # "main": "index.js", # "scripts": { # "start": "node index.js", # "dev": "nodemon index.js", # "test": "jest" # }, # "dependencies": { "express": "^4.18.2" }, # "devDependencies": { "nodemon": "^3.0.1" } # }
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