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Feature Flag Demo

A simple console application to demonstrate PostHog feature flag functionality.

Setup

  1. Install dependencies:

    bin/setup

  2. Set your PostHog API key and URL:

    export POSTHOG_API_KEY="your_project_api_key"
export POSTHOG_API_URL="https://us.i.posthog.com"  # Or your self-hosted instance

Usage

Run the demo with:

mix run run.exs --flag FLAG_NAME --distinct-id USER_ID [options]

Options:

  • --flag FLAG_NAME - The name of the feature flag to check
  • --distinct-id USER_ID - The distinct ID of the user
  • --groups GROUPS - JSON string of group properties (optional)
  • --group_properties PROPERTIES - JSON string of group properties (optional)
  • --person_properties PROPERTIES - JSON string of person properties (optional)

Example:

mix run run.exs --flag "test-flag" --distinct-id "user123"

Example Output

If the feature flag is enabled:

Feature flag 'your-feature-flag' is ENABLED
Payload: true

If the feature flag is disabled:

Feature flag 'your-feature-flag' is DISABLED