Be it any industry, applications need to talk to each other. So, developers often build bridges – Application Programming Interfaces (API) – to allow one system to communicate to another. HTTP is the most common protocol used to consume APIs and serving JSON over HTTP is probably the most popular way of consuming APIs. But there are multiple ways or API patterns to serve JSON over HTTP, each very different and each having its pros and cons. In my session, we will look at the three ways of serving JSON over HTTP - HTTP API, GraphQL and gRPC HTTP API(experimental). We will understand the basics and also see how to implement an API using all the three patterns and finally run a comparison between the three of them