Assuming you’ve already installed Node.js, create a directory to hold your application, and make that your working directory.
$ mkdir myapp $ cd myapp
Use the npm init
command to create a package.json
file for your application. For more information on how package.json
works, see Specifics of npm’s package.json handling.
$ npm init
This command prompts you for a number of things, such as the name and version of your application. For now, you can simply hit RETURN to accept the defaults for most of them, with the following exception:
entry point: (index.js)
Enter app.js
, or whatever you want the name of the main file to be. If you want it to be index.js
, hit RETURN to accept the suggested default file name.
Now install Express in the app
directory and save it in the dependencies list. For example:
$ npm install express --save
To install Express temporarily and not add it to the dependencies list, omit the --save
option:
$ npm install express
Node modules installed with the --save
option are added to the dependencies
list in the package.json
file. Afterwards, running npm install
in the app
directory will automatically install modules in the dependencies list.
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