In this section, we will discuss Overleaf's data model. Overleaf uses MongoDB for data persistence, the only database name is called sharelatex, which is also the predecessor of Overleaf.
If you haven't setup Mongo Express for overleaf, it's highly recommended to see Setup Develop Tools, and setup your mongo.
Once you have setup your Mongo Express, you can login http://localhost:8081/ with admin:pass credentials.
There are a ranges of schemas in mongoDB, here we mainly focus on Overleaf CE related:
