https://docs.mongodb.com/manual/tutorial/install-mongodb-on-os-x/) code example

Example 1: brew mongo start

brew services start mongodb-community@4.4

Example 2: mongodb installation on mac

//Starts Mongdb server @ mongodb://127.0.0.1:27017/
brew services start mongodb-community@4.2
mongod --config /usr/local/etc/mongod.conf --fork
ps aux | grep -v grep | grep mongod
mongo