What is Feature Flags
Feature toggles in code
Feature Flags are a software development technique that allows enabling or disabling application functionality without code changes or redeployment.
Types of Feature Flags
- Release Flags — controlling new feature rollouts
- Experiment Flags — A/B testing and experiments
- Ops Flags — operational system management
- Permission Flags — feature access control
Benefits
- Gradual rollout of new features
- Instant rollback of problematic changes
- A/B testing without releases
- Separation of deploy and release
- Canary releases for limited audiences
Popular Solutions
- LaunchDarkly
- Split.io
- Flagsmith
- Unleash (open source)
- Firebase Remote Config
Best Practices
Feature flags should be temporary and removed after complete feature rollout.