Will this book be useful for you? It depends on your approach to programming, and whether or not you find cookbooks to be of use to you and your coding style. If you enjoy code cookbooks, then this is a well-written and well-explained example of such. If you prefer books of a more traditional sense - focusing on a specific topic and leading you through steps to learn the ins and outs of the system or programming language, then you will not find this here. Depending also on your specific need for MongoDB (i.e. using it with NodeJS), this book may not offer enough recipes on that topic to suit your needs. Before purchasing it, I recommend thinking about your exact needs, and skimming the table of contents.