In SailsJS, when you develop an API, the process of mapping the routs with controllers is very easy and clean. And then function development in those controllers are like piece of cake. Also, authenticating the users with MS-Auth tokens using passport JS was quite clean. Other than this, integeration of ORM with any kind of databases in quite sorted with just few simple configurations on JS file level. I had a smooth experience doing the CRUD operations with the MongoDB ORM. Build process for both the development and production mode is made quite simple.

The MVC pattern is amazing for plug and play; moreover, it offers flexibility to build your patterns.

1. well-organized structures of model, view, and controller. 2. The middleware plays an important role in security, and connection between the backend and other integrations, inside config you can customize each and everything very easily i.e. sockets, security, datastores, policies, routes, etc. They are well easy to understand. 3. connection between the controller, helper functions, routes, and Models is very easy and because of this, anyone can implement typical logic and build API in a more effective way. 4. Different databases support like MySQL, Postgres, MongoDB help a lot to move data from one another. 5. Easy to deploy within development and production environments just by changing some variable's name. 6. Well supported Socket.io which helps to get real-time interaction like chat. 7. Documentation is very clear and easy to understand for beginners. 8. Easy to lift the application 9. Easy to develop REST API.