In this article, we are going to implement CRUD operations into the NestJS application using Azure Cosmos DB. Azure Cosmos DB: Azure Cosmos DB is a fully managed NoSQL database. NoSQL says data will be stored as a key/value JSON document. Cosmos DB provides 'High Availability' and 'Low Latency' for any application. Cosmos DB is very quick in response delivering, auto-scaling, effective auto failure management, etc. Any existing application that works on different DBs can be easily migrated to Azure CosmosDB as it provides APIs for integration like 'SQL/Core API'(most recommended API, our demo uses this 'SQL/Core API'), 'MongoDB API', 'Cassandra API', 'Germlin API', 'Table API'. Let's understand the structure of the Cosmos DB: Create an Azure Cosmos Account with an appropriate subscription inside of the Azure portal. After creating the Cosmos Account, we can manage the data of our account by creating 'Database'