Anyone who has worked with Node.js and its documentation will know that the docs are pretty much only hosted on the nodejs.org website these days. Unfortunately, that leaves offline browsing of the docs in a particularly poor state. Since I have had the need to refer to these docs often enough without having an Internet connection, I imagine there are of ton of other people who are having the same issue.
In response, I have created a PDF file of the online docs that you can use for offline use. Download the PDF and happy coding!