GraphQL is a query language and web application programming interface (API) for client-server architecture. Its advantages include type-safe queries, which allow clients to retrieve the data they require precisely in a single request. As organizations adopt GraphQL for API implementations, it is imperative to understand its challenges and the software community's interests. To achieve this goal, we conducted a five-step mixed-method empirical analysis of 45K StackOverflow questions and answers on GraphQL. In the first step, we derive a reference architecture for the GraphQL ecosystem with five key layers. Second, we used topic modeling based on Latent Dirichlet Allocation (LDA) to automatically identify 14 topics and 47 subtopics. Third, we mapped discussion topics to architecture layers. Fourth, we manually investigate questions on each topic and subtopics to provide additional insight to the GraphQL stakeholders. Finally, we study topic difficulty, popularity, trends, and tradeoffs to provide insights into evolving community interests and challenges. Our results indicate that Client and Server are the top two architectural layers attracting discussion on SO. While earlier discussions on SO focused on building third-party applications consuming GraphQL APIs (i.e., API Integration) released by large organizations, recent trends suggest more organizations implementing APIs using GraphQL servers. Due to difficulty and lack of well-defined solutions, security remains a difficult and low-interest area. However, such a practice can lead to vulnerable APIs.

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