Raspberry Pi 3 Express Application (part 8)

Check Node and npm are installed,

$ node --version
v7.4.0
$ npm --version
4.0.5

Install Express generator globally,

$ npm install express-generator -g

Check it,

$ express --version
4.14.0

Create a new directory inside /opt/nodeserver

$ mkdir tempGraph

This will create several folders as well as the package.json file with all dependencies. Next install these dependencies,

$ sudo npm install

This automatically locates package.json in the same directory as the command is run in and installs them.

Start express with,

$ npm start

open another terminal on the same system and type,

$ curl localhost:3000

You should see same HTML,

Install nodemon to automatically restart application should it be updated, which will happen frequently during development.

$ npm install -g nodemon

To start nodemon, first top the application and be sure to be in the applications directory, then,

$ nodemon

Nodemon is for development not production.