It has also been free on Google Play Books for quite some time now. I have read it. It is very introductory. The author describes the idea behind the creation

It has also been free on Google Play Books for quite some time now. I have read it. It is very introductory. The author describes the idea behind the creation of Node. Probably interesting for a beginner (either on Node or generally on web developing) who would like to decide which framework he/she wants to learn.