Monorepos have been around for some time but only recently gained popularity in the JavaScript community. The promise of easily sharing code, better enforcing organizational standards, greater developer mobility due to common tooling, and more is very appealing. Still, if approached naively, a monorepo will quickly turn into a huge mess: skyrocketing slow CI times, spaghetti dependencies among projects, hard to navigate, and ultimately leading to frustration. In this talk, we will look at the available tooling, how to kickstart a new React monorepo in particular, and we will learn the key ingredients required to build a successful, long-running monorepo that scales.