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Installing MongoDB with Homebrew (Catalina and non-Catalina)
Updated steps to install MongoDB on a Mac.

I had to reconfigure my Macbook after sending it for repairs. During the reconfiguration period, I noticed the instructions I linked to in "Setting up a local MongoDB connection" were outdated.

Here's an updated version on how to install MongoDB on a Mac.

There are a few steps:

First, you install Homebrew. If you're curious about what Homebrew is, read this article.

# Installs Homebrew
/usr/bin/ruby -e "$(curl -fsSL"

Second, find the MongoDB tap.

brew tap mongodb/brew

Third, install MongoDB.

brew install mongodb-community

MongoDB is now installed on your computer.

Using MongoDB

If you want to use MongoDB, you need to create a /data/db folder on your computer.

Before MacOS Catalina

To use MongoDB, you need to create the /data/db folder with this command:

sudo mkdir -p /data/db

You also need to give permissions to use it:

sudo chown -R `id -un` /data/db

Now you can follow the rest of the article to set up your MongoDB connection.

Update for MacOS Catalina

Apple created a new Volume in Catalina for security purposes. If you're on Catalina, you need to create the /data/db folder in System/Volumes/Data.

Use this command:

sudo mkdir -p /System/Volumes/Data/data/db

Then, use this command to give permissions:

sudo chown -R `id -un` /System/Volumes/Data/data/db

Once you do this you should be able to run mongod as usual.

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