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From the github main page:
https://github.com/fabricjs/fabric.js
Install with bower
$ bower install fabric
Install with npm
To install Fabric.js using npm, you must first manually install Cairo on your system. Cairo is a system library which powers node-canvas, which Fabric.js relies on. When the installation is complete, you may need to restart your terminal or command prompt before installing fabric.
$ npm install fabric --save
Have you did all the steps? Node is Ok?
Check it out the page, there is a lot of tips there:
Install Node.js, then install NPM, if necessary.
To install NPM packages
$ npm install
Run test suite, make sure testem is installed
$ npm install -g testem
Tell me if it helps.
Source:stackexchange.com