Install MongoDB Community Edition on macOS


The following tutorial uses Homebrew to install MongoDB 4.2 Community Edition on macOS systems. To install a different version of MongoDB, please refer to that version’s documentation. For example:

Platform Support

MongoDB 4.2+ only supports macOS versions 10.12+ on Intel x86-64. See Supported Platforms for more information.

Install MongoDB Community Edition


If you have the Homebrew brew package installed on your OSX host and you have previously tapped the official MongoDB Homebrew Tap, skip the prerequisites and go to the Install MongoDB step.

Install XCode

Apple’s XCode includes command-line tools that are required by brew, and is available for free on the App Store. Make sure you are running the latest version.

Install Homebrew

OSX does not include the Homebrew brew package by default. Install brew using the official instructions.

Tap the MongoDB Homebrew Tap

Issue the following from the terminal to tap the official MongoDB Homebrew Tap:

brew tap mongodb/brew

Install MongoDB

From a terminal, issue the following:

brew install mongodb-community@4.2


If you have previously installed an older version of the formula, you may encounter a ChecksumMismatchError. To resolve, see Troubleshooting ChecksumMismatchError.

In addition to the binaries, the install creates:

Run MongoDB

You can run MongoDB as a macOS service using brew, or you can run MongoDB manually as a background process. It is recommended to run MongoDB as a macOS service, as doing so sets the correct system ulimit values automatically (see ulimit settings for more information).

  • To run MongoDB (i.e. the mongod process) as a macOS service, issue the following:

    brew services start mongodb-community
  • To run MongoDB manually as a background process, issue the following:

    mongod --config /usr/local/etc/mongod.conf --fork

Both methods use the /usr/local/etc/mongod.conf file created during the install. You can add your own MongoDB configuration options to this file as well.

To verify that MongoDB is running, search for mongod in your running processes:

ps -ef | grep -v grep | grep mongod

You can also view the log file to see the current status of your mongod process: /usr/local/var/log/mongodb/mongo.log.

Connect and Use MongoDB

To begin using MongoDB, connect a mongo shell to the running instance. From a new terminal, issue the following:


For information on CRUD (Create,Read,Update,Delete) operations, see:

Additional Considerations

Troubleshooting ChecksumMismatchError

If you have previously installed an older version of the formula, you may encounter a ChecksumMismatchError, as in the following example:

Error: An exception occurred within a child process:

  ChecksumMismatchError: SHA256 mismatch

Expected: c7214ee7bda3cf9566e8776a8978706d9827c1b09017e17b66a5a4e0c0731e1f

  Actual: 6aa2e0c348e8abeec7931dced1f85d4bb161ef209c6af317fe530ea11bbac8f0

 Archive: /Users/kay/Library/Caches/Homebrew/downloads/a6696157a9852f392ec6323b4bb697b86312f0c345d390111bd51bb1cbd7e219--mongodb-macos-x86_64-4.2.0.tgz

To retry an incomplete download, remove the file above.

To fix:

  1. Remove the downloaded .tgz archive.

  2. Retap the formula.

    brew untap mongodb/brew && brew tap mongodb/brew
  3. Retry the install.

    brew install mongodb-community@4.2

Localhost Binding

Starting with MongoDB 3.6, MongoDB binaries, mongod and mongos, bind to localhost by default.

When bound only to the localhost, these binaries can only accept connections from clients that are running on the same machine. Remote clients cannot connect to the binaries bound only to localhost. For more information, including how to override and bind to other ip addresses, see Localhost Binding Compatibility Changes.