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# Install nodemon
npm install nodemon
# Install nodemon globally on your machine
npm install -g nodemon
# Install nodemon on your project as dev-dependency
npm install nodemon --save-dev
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// globally install nodemon
npm install -g nodemon
// modify package > script for easily use
"start": "node index.js", // replace index.js by your file-name
"start-dev": "nodemon index.js",