A technical deep dive into the Fission algorithm, how it decomposes a consumer-facing supergraph into subgraph responsibilities, automating the hardest part of GraphQL Federation at scale.

Wundergraph is a blog or publication focused on GraphQL, a query language and runtime for APIs. Through tutorials, guides, and case studies, Wundergraph explores various aspects of GraphQL development, including schema design, query optimization, and integration with frontend frameworks. Developers can learn how to leverage GraphQL to build efficient and flexible APIs that meet the needs of modern web and mobile applications.

WunderGraph

Fission is a stateful schema graph engine from WunderGraph that inverts the traditional GraphQL Federation workflow. Instead of composing subgraphs bottom-up into a supergraph, architects design the supergraph first and Fission decomposes it into subgraph specifications. The algorithm automatically handles transitive dependency propagation, entity @key directive propagation, @shareable directive management, cascading renames, and continuous validation. Every edit follows a validate-first, mutate-second pattern ensuring no half-applied changes. Fission integrates with WunderGraph Hub, a collaborative API design platform, enabling teams to design like a monolith and implement as microservices.

How the Fission Algorithm Works: Top-Down GraphQL Federation Design