GraphQL has been gaining popularity and it has made its way to the forefront of API development. There are several GraphQL clients available today for front-end frameworks. Apollo client is one of the popular clients for Angular applications.
GraphQL is a query language for APIs that allows clients to request limited data they need, making it possible for clients to gather data in a limited number of requests. GraphQL is strongly typed protocol and all data operations are validated against a GraphQL schema.
Most communications between microservices is either via HTTP request-response APIs or asynchronous messaging. While these two mechanisms are most commonly used, yet they’re quite different. It is important to know when to use which mechanism.