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Standardized interfaces are the connecting link of today's distributedsystems, facilitating access to data services in the cloud. REST APIs have beenprevalent over the last years, despite several issues like over- andunderfetching of resources. GraphQL enjoys rapid adoption, resolving theseproblems by using statically typed queries. However, the redevelopment ofservices to the new paradigm is costly. Therefore, several approaches for thesuccessive migration from REST to GraphQL have been proposed, many leveragingOpenAPI service descriptions. In this article, we present the findings of ourempirical evaluation on the APIs.guru directory and identify several schematranslation challenges. These include less expressive schema types in GraphQL,as well as missing meta information about related resources in OpenAPI. To thisend, we developed the open source Link Generator, that analyzes OpenAPIdocuments and automatically adds links to increase translation utility. Thisfundamentally benefits around 34% of APIs in the APIs.guru directory. Ourfindings and tool support contribute to the ongoing discussion about themigration of REST APIs to GraphQL, and provide developers with valuableinsights into common pitfalls, to reduce friction during API transformation.

A Link Generator for Increasing the Utility of OpenAPI-to-GraphQL Translations