For example, in the above website, on right hand side section there is a link to MongoClient. Clicking the link results in 404: Page Not Found message.
I have inspected the URL for MongoClient link and found that If the URL is changed to following then the page loads correctly: MongoClient | mongodb
So the issue is with the link generation. Please fix the links so that it is easier to navigate between the pages and view latest documentation.
Thank you for the bug report and the extra detective work. It looks like the 4.0 API docs are being generated with lowercase urls instead of the expected mixed case.
I am already using the latest Node.js 4.1 driver package from NPM. However in the MongoDB document page for Node.js 4.1 driver ( MongoDB Node Driver — Node.js), the API reference link is still pointing to v4.0 (where the Node.js version is showing 4.1). So I was navigated to v4.0 page and found the issue. I am now visiting v4.1 API reference page and not facing the issue. I think it would also be nice if the link in MongoDB documentation site is also updated.