As of MongoDB 4.4 (released July 30, 2020), you may need to install mongodump separately because the MongoDB Database Tools (which comprises mongodump, mongorestore, and more) has become its own project.
I found this out because I upgraded to MongoDB 4.4 today and mongodump stopped working.
$ mongodump
zsh: command not found: mongodump
I’m on macOS and installed MongoDB via Homebrew. To get mongodump and friends back, I installed the MongoDB Database Tools via Homebrew:
brew tap mongodb/brew
brew install mongodb-database-tools
If you’re on a different OS, this should help:
MongoDB Database Tools Installation