Real-Time APIs with GraphQL Subscriptions in Elixir and Absinthe

Modern application users expect instant updates without manual page refreshes. Building these real-time experiences requires a robust, concurrent backend that can handle thousands of simultaneous connections without breaking a sweat. This text-based course guides you through the foundational concepts and practical steps to implement real-time GraphQL subscriptions using Elixir, Absinthe, and the Phoenix framework. You will transition from understanding basic polling to mastering push-based, real-time data delivery. By studying the structured explanations and code examples, you will learn how to leverage Elixir's concurrency model to manage state and broadcast updates efficiently. What you'll learn: - Understand the core concepts of GraphQL subscriptions and how they differ from queries and mutations - Configure Absinthe and Phoenix sockets to establish persistent WebSocket connections - Implement pub/sub patterns to broadcast database changes and application events instantly - Structure your schema to support clean, maintainable real-time subscription fields - Apply security best practices, including token-based authentication for WebSocket connections - Structure and write clean, modern Elixir code utilizing current type specifications and testing practices We start with the fundamental architecture of WebSockets and the Erlang VM's actor model. From there, you will read through step-by-step configuration guides, explore schema design, and learn how to trigger subscriptions from your mutations. The course wraps up with testing strategies and production readiness tips. This course is designed for backend developers, API designers, and Elixir beginners who understand basic Elixir syntax and want to master real-time API design. No prior experience with GraphQL subscriptions is required. Start reading today to build scalable, real-time APIs with confidence.