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npm is the package manager for Node.js modules. It is used for managing and publishing modules.

The template (and your future service) needs its dependencies to be present. Install them with:

npm install 

Sometimes the configuration can get a bit messed up you may experience strange npm-related errors when running your service. The remedy is:

rm -rf node_modules npm install 

If you need to add a dependency, this will install it and add it your package.json:

npm install --save <name_of_module> 

The template comes with some handy npm tasks. To start your service based on the configuration in config.yaml, use simply:

npm start 

Starting unit tests is as easy as:

npm test 

A code coverage utility is also available:

npm run-script coverage 

Once the script finishes, open up coverage/lcov-report/index.html which will show you detailed reports about which lines of code have been covered by the unit tests.

Included in the template is also a Dockerfile, allowing you to run and test your service in a production-like environment inside of a Docker container. You need to have docker installed if you are on a Linux host, or boot2docker in case of OSX/Windows hosts.

To start your service in the container, execute:

npm run-script docker-start 

The first time you run it, it takes a while as the script automatically builds the full image and then starts the service.

If you want to test your service instead, use:

npm run-script docker-test 

Similarly, to run code coverage, run:

npm run-script docker-cover 

Note: On Linux hosts, running docker requires superuser rights, so you may need to prefix the commands with sudo. If you are on a Ubuntu box, you may circumvent that by adding yourself to the docker group:

sudo gpasswd -a <your_username> docker 

After you log out completely and log back in, you should be able to run the above scripts without resorting to sudo.

See this document for how to get ready to deploy your service.

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