feature-flags-api

To add PostHog feature flags to an API, you evaluate boolean or variant flags server-side per user using environment variables for keys, capturing $feature_flag_called events for analytics attribution.

Server-side feature flag evaluation controls API behavior per user or group without repeated deployments, allowing phased experiments and rollouts by checking flag states directly in the backend service.

You track feature flag exposure by capturing $feature_flag_called events and appending flag attribution properties to subsequent analytics events, enabling segmentation of results by the active variant.

Yes, PostHog feature flags enable backend API rollouts without redeploying by evaluating flag states server-side per request, allowing you to toggle behavior dynamically using environment variable configurations.

The best way to handle missing or failed PostHog feature flags is to implement production-safe fallback logic, ensuring the API defaults to stable behavior when flag evaluation fails or returns no data.

Yes, you need environment variables to securely configure PostHog project tokens and keys in your API, ensuring minimal code changes and safe server-side flag evaluation across deployments.