Implementing Middleware in Absinthe for GraphQL API Security

Building a robust API requires more than just fetching and saving data; you must ensure that sensitive fields are protected and errors are handled gracefully without exposing system internals. This text-based course guides you through securing your Elixir applications by implementing custom middleware within the Absinthe GraphQL framework. You will start with the foundational concepts of Absinthe schemas, understanding how resolution works under the hood before diving into security practices. By the end of this course, you will be able to intercept queries and mutations, enforce strict authorization rules, and sanitize error responses to keep your application safe. What you will learn: Understand the core architecture of Absinthe schemas and resolution pipelines; Create custom middleware to intercept and validate GraphQL fields; Implement role-based and attribute-based authorization checks; Standardize error formats to prevent sensitive data leaks; Apply modern API security practices like rate limiting and complexity analysis; Practice writing clean, maintainable Elixir code for field-level resolution. This course begins with essential GraphQL security definitions and foundational Absinthe concepts before moving into practical code implementations and step-by-step security configurations. It is designed for backend developers and Elixir enthusiasts who are new to Absinthe or looking to systematically secure their GraphQL endpoints. Start writing secure, production-ready Elixir APIs today.