configure scripts to run in Nodejs

By default Nodejs package.json contains a single scripts, but you can add and use as many you want.

For example I want to setup a development script with nodemon and and want to run a particular javascript file.

First find the flowing section in pacakge.json file

"scripts": {
        "test": "echo \"Error: no test specified\" && exit 1"

and add one more line to it as follows

"scripts": {
        "dev": "nodemon app.js localhost:3000",
        "test": "echo \"Error: no test specified\" && exit 1"

Run the script

We can now use npm command to run the script we configured as

npm run dev

Remember add the nodemon to your project. It is is developer dependency. Don’t know how to add dependency ?, here is the guide.

  • Add packages to dependency in Nodejs

    Do you know that, we can add package names to packages.json file while install using npm ( Node Package Manager)

    Wanna learn how to add a package file to Node project. Here it is


    For this we have to use npm install <package-name> –save

    npm install express  --save

    In your package file it will show as

     "dependencies": {
            "express": "^4.17.1",
            "": "^3.0.1"

    Uninstalling will also remove it from the dependency list.

    Developer dependecies

    Packages which are used only for at the time of development are called developer dependecies. We can add developer dependencies by adding an option with Install save option as -dev. nodemon is an ideal example for development dependency.

    npm install nodemon --save-dev

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A developer,teacher and a blogger obsessed with Python,Dart and open source world from India

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