PostHog Hello World

Overview

Minimal working examples demonstrating the three core PostHog operations: capturing events, identifying users, and evaluating feature flags. Covers both browser (posthog-js) and server (posthog-node) SDKs.

Prerequisites

• Completed posthog-install-auth setup
• Project API key (phc_...) configured
• posthog-js and/or posthog-node installed

Instructions

Tool discipline

Use Read to inspect the relevant configuration and implementation before proposing changes. Use Write only for a new, explicitly requested artifact inside the target project. Use Edit for minimal changes to existing project files after the evidence pass.

Step 1: Capture Your First Event (Node.js)