CRUD is a shorthand for Create, Read, Update, and Delete operations. CRUD testing is an alternate term for database testing.
Database forms an inevitable part of the software and forms the main structure of any application- web or desktop and data is stored somewhere. A user enters the information and the data will be stored in some form. An organization can use the available databases in the market such as MS Access, Oracle, MySQL, DB2, etc. It depends on the requirements of an organization to choose which database has to be integrated with their application.
If you want to learn to build a CRUD app with Node Js Express and MongoDB, then enroll in this Node Js Certification by Intellipaat.
Also, watch this video on CRUD App with Node Js: