The main objectives of this article are: MongoDB MongoDB Atlas Cloud Service MongoDB ConnectionString Install Mongo Libraries In NestJS App Create A 'SuperHeroes' Module In NestJS App Create A Service Like 'SuperHeroesService' In NestJS App MongoDB: MongoDB is a document-oriented database, which is classified as a NoSQL database. In MongoDB, tables are called collections, and records are called documents. It stores data in BSON format. The BSON is binary serialization of JSON. The reading of data from MongoDB is faster when compared to the Relational Database. But MongoDB doesn't have a relation between the collections. We can't declare NoSQL is better than SQL or vice-versa. So depending on the application requirement either select NoSQL or SQL or Both databases. MongoDB Atlas Cloud Service: For our demo of using MongoDB let's use the MongoDB Atlas cloud service. (Step 1)So let's go to the MongoDB Atlas website and then signup for 'Free'(pricin