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NodeJS

NodeJS has gained immense popularity in the last few years. JavaScript is the language of client-side development on the web, and many people are excited about developing in the same language on the server side. One of the chapters in this book discusses Hubot, GitHub’s "devops" chatbot. Hubot is written in NodeJS. Fortunately, installing NodeJS is simple using NVM.

NVM stands for "Node Version Manager" and is a direct correlate to RVM. To install it run these commands from a shell prompt:

$ curl https://raw.github.com/creationix/nvm/master/install.sh | sh

package.json

Much like Ruby has a Gemfile which indicates required libraries, so too does NodeJS have an equivalent file. In NodeJS, this file is called package.json. To install all required libraries for any project, use the npm tool. Running without any arguments will install all libraries specified by the application if there is a package.json file included with the project.