Building GraphQL APIs with Absinthe, Phoenix, and Plug

Modern application development demands flexible, efficient APIs that can aggregate data from multiple sources without over-fetching. By leveraging the power of Elixir, Phoenix, and Absinthe, you can build highly concurrent GraphQL APIs that remain maintainable as your codebase grows. This text-based course guides you through the entire process of designing and implementing a robust API from the ground up. You will transition from understanding basic API limitations to building a fully functioning, type-safe GraphQL schema that queries databases and external services. Along the way, you will explore modern best practices, including resolving the N+1 query problem using Dataloader and managing real-time updates safely. What you'll learn: - Understand the core principles of GraphQL schemas, queries, mutations, and types within Absinthe - Integrate Absinthe seamlessly with Plug and Phoenix to handle HTTP requests - Resolve data efficiently from SQL databases and external APIs using Ecto - Implement Dataloader to optimize database queries and eliminate performance bottlenecks - Secure your API endpoints with token-based authentication and context-aware plugs - Write unit tests for your schemas and resolvers using modern testing practices This course begins with essential terminology, GraphQL specifications, and the architectural foundations of the Elixir ecosystem. You will then progress through step-by-step written tutorials, constructing schema definitions, writing custom resolvers, and fine-tuning database performance. This course is designed for backend developers, software engineers, and curious beginners who have a basic familiarity with Elixir and want to master GraphQL API development. No prior experience with Absinthe or Phoenix is required. Start reading today to build fast, scalable, and highly queryable APIs with Absinthe.