Learn PHOENIX with Real Code Examples
Updated Nov 27, 2025
Practical Examples
Build a real-time chat application with Channels
Create a RESTful API backend with Ecto
Develop live dashboards using LiveView
Implement role-based authentication and authorization
Integrate third-party APIs for notifications or payments
Troubleshooting
Check logs in `log/` folder
Use `mix phx.server` in development for error output
Ensure dependencies are installed via `mix deps.get`
Validate database connection and migrations
Use `iex -S mix` for interactive debugging
Testing Guide
Use ExUnit for unit and integration tests
Test controllers, models, and Channels
Use fixtures or factories for database testing
Run `mix test` for automated test execution
Use mocks for external services
Deployment Options
Deploy using releases via `mix release`
Docker containers with Elixir runtime
Deploy on Gigalixir, AWS, or DigitalOcean
Use systemd or other process managers
Horizontal scaling with clustering and PubSub
Tools Ecosystem
Mix build tool
Ecto for ORM and migrations
Phoenix Channels for real-time messaging
HEEx templates and LiveView
Phoenix generators for scaffolding
Integrations
PostgreSQL, MySQL, SQLite
Redis or other caching backends
Message brokers like RabbitMQ or Kafka
LiveView for reactive UI
Third-party APIs for payment and notifications
Productivity Tips
Use generators for scaffolding
Leverage LiveView for dynamic UI
Reuse contexts for domain logic
Optimize queries and Channels
Automate tests and CI/CD pipelines
Challenges
Learning functional programming for newcomers
Managing state in highly concurrent systems
Scaling Channels and PubSub for millions of connections
Debugging complex OTP supervision trees
Integration with legacy systems or external APIs