You can install jets via RubyGems.

gem install jets

Or you can add jets to your Gemfile in your project.

gem "jets"



You can install the AWS CLI via pip.

pip install awscli --upgrade --user

Then configure it.

aws configure



Jets uses Ruby 2.5.0 and code written with patch variants of it will work.


For apps with HTML pages, jets uses webpacker to compile assets which requires node’s yarn. Node version manager, nvm, is recommended to install a desired version of node. Here’s a node install cheatsheet, though prelease refer to the links for the most updated commands with possible more recent versions:

curl -o- | bash
# note follow the instructions after the curl command to source nvm
nvm install 8.10.0 # please check AWS Lambda for the latest node runtime
nvm alias default node # sets the default version

Once node is installed, install yarn with:

npm install -g yarn

You can use any version of yarn that works with webpacker.


By default, when you run a jets new command, it generates a Gemfile that has database adapter gem like mysql2 or pg. A bundle install is run immediately as part of the jets new command. So the specific database needs to be installed. The current default ORM database is MySQL.

If you do not need an ORM database adapter, you can use the jets new --no-database option, and a database gem will not be added to the Gemfile.

Here are various ways to install different databases:


brew install mysql # macosx
yum install -y mysql-devel # amazonlinux2 and redhat variants
apt-get install -y libmysqlclient-dev # ubuntu and debian variants


brew install postgresql # macosx
yum install -y postgresql-devel # amazonlinux2 and redhat variants
apt-get install libpq-dev # ubuntu and debian variants

Pro tip: Use the <- and -> arrow keys to move back and forward.

Edit this page

See a typo or an error? You can improve this page. This website is available on GitHub and contributions are encouraged and welcomed. We love pull requests from you!