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Analytics transforms user behavior into actionable data. This skill covers integrating analytics providers (Plausible, PostHog, GA4), designing event taxonomies, building privacy-first tracking, setting up conversion funnels, and implementing A/B testing. The focus is on collecting only what matters while respecting user privacy and complying with GDPR/CCPA.
Key Concepts
Analytics Provider Comparison
Feature
Plausible
PostHog
GA4
Custom
Privacy-first
Yes (no cookies)
Configurable
No (requires consent)
You control it
Self-hostable
Yes
Yes
No
Yes
Session replay
No
Yes
No
Build it
Feature flags
No
Yes
No
Build it
A/B testing
No
Yes
Yes (Optimize sunset)
Build it
Funnels
Basic
Yes
Yes
Build it
Cost
$9+/mo or self-host
Free tier + paid
Free (with limits)
Infrastructure cost
Cookie-free
Yes
Optional
No
Your choice
GDPR compliant (no consent)
Yes (EU hosting)
Self-hosted only
No
If self-hosted
Event Taxonomy
Use a consistent naming convention across your entire application:
Past tense for completed actions: form.submitted not form.submit
Include context as properties, not in the event name: button.clicked { label: "Buy Now" } not buy_now_button.clicked
Workflow
Step 1: Choose Your Provider
Need cookie-free, GDPR-compliant out of the box?
-> Plausible
Need session replay, feature flags, and funnels?
-> PostHog
Need to integrate with Google Ads / Search Console?
-> GA4 (with consent banner)
Need full control and own your data?
-> Custom analytics pipeline
Step 2: Implement the Analytics Layer
Plausible (Privacy-First, No Cookies)
// lib/analytics/plausible.tsconstPLAUSIBLE_DOMAIN = process.env.NEXT_PUBLIC_PLAUSIBLE_DOMAIN!;
constPLAUSIBLE_API = process.env.NEXT_PUBLIC_PLAUSIBLE_API_HOST ?? 'https://plausible.io';
exportfunctiontrackEvent(eventName: string,
props?: Record<string, string | number | boolean>
) {
if (typeofwindow === 'undefined') return;
if (window.location.hostname === 'localhost') return;
// Uses the Plausible Events API — no cookies, no consent neededfetch(`${PLAUSIBLE_API}/api/event`, {
method: 'POST',
headers: { 'Content-Type': 'text/plain' },
body: JSON.stringify({
n: eventName, // event nameu: window.location.href,
d: PLAUSIBLE_DOMAIN,
r: document.referrer || null,
p: props ? JSON.stringify(props) : undefined,
}),
}).catch(() => {
// Silently fail — analytics should never break the app
});
}
exportfunctiontrackPageview() {
trackEvent('pageview');
}
Never block rendering for analytics — Load scripts with defer or afterInteractive. Fire events asynchronously. Analytics failures must never break the app.
Use a unified abstraction layer — Wrap all providers behind a single track() function so you can swap providers without changing application code.
Batch events and use sendBeacon — Batching reduces HTTP requests. sendBeacon guarantees delivery on page unload, unlike fetch.
Respect Do Not Track — Check navigator.globalPrivacyControl and navigator.doNotTrack. For Plausible, this is handled automatically.
Keep event names stable — Changing event names breaks funnels and dashboards. Treat your event taxonomy like a public API.
Track properties, not event variants — Use button.clicked { label: "Sign Up" } instead of signup_button_clicked. This keeps your event count manageable.
Separate analytics API from app API — Analytics ingestion endpoints should not share rate limits or auth with your main API. Use a dedicated route.
Test tracking in development — Log events to console in dev mode instead of sending to the provider. Verify events fire before deploying.
