Client-side tracking relies on JavaScript running in visitor browsers. But browsers have limitations. Ad blockers block tracking scripts. Privacy settings disable cookies. Third-party scripts fail to load. You lose data. Server-side tracking sends data directly from your servers. Your servers know when events happen. Your servers send them to analytics. Ad blockers can't interfere. Privacy settings don't block them. Server-side tracking is more reliable. It captures data client-side tracking misses.
This article explains server-side tracking and when to use it.
Why Server-Side Tracking Matters
Client-side tracking loses data. Ad blockers block 10-40 percent of visitors. Browser privacy settings block more. Third-party scripts are unreliable. You miss data from these visitors.
Server-side tracking avoids these issues. Your servers send data. Visitors can't block it with browser settings. Ad blockers don't touch it. You capture data from all visitors.
Server-side tracking is also more accurate. Your servers know the true event. A purchase server-side knows the actual amount. Client-side can only estimate based on page data.
Understand Server-Side vs Client-Side
Client-side tracking runs JavaScript on visitor browsers. The browser sends data to analytics. This is simple but unreliable.
Server-side tracking runs on your servers. When an event happens, your server sends data to analytics. The visitor never directly sends anything. Your server is the source.
Hybrid tracking combines both. Client-side for user interactions. Server-side for confirmed transactions. Both together give you a complete picture.
Implement Server-Side Tracking
Server-side tracking requires development work. When an event happens on your server, call your analytics platform's API. Send the relevant data.
For e-commerce, when you confirm a purchase, send a purchase event. Include amount, items, customer data. Your analytics platform receives it.
For SaaS, when a user creates an account, send a signup event. When they upgrade, send an upgrade event. Your server is the source of truth.
Match Server Events to Visitor Sessions
Server-side events need context. Which visitor made this purchase. You need to link server events to client-side sessions.
Use visitor IDs. When a visitor logs in, you know their ID. When they make a purchase, send the purchase with their ID. Your analytics platform links it to their session.
For anonymous visitors, use cookies. A browser cookie contains a visitor ID. When the visitor makes a purchase, read the cookie. Send the purchase with that ID.
Decide What to Track Server-Side
Track confirmed events server-side. Purchases. Signups. Account upgrades. Events your server knows are real and complete.
Don't track client-side behavior server-side. Page views. Clicks. Scrolls. These are better tracked client-side. Your server doesn't know about them.
Think about data accuracy. If your server knows the data, track it server-side. Your server knows purchase amounts. Your server knows user types. Your server knows feature usage.
Handle Data Duplication
If you track both client-side and server-side, you might send events twice. A purchase tracked both ways appears as two purchases in analytics.
Prevent duplication by using event IDs. Give each event a unique ID. If the same ID arrives twice, ignore the duplicate.
Or use different analytics properties. Client-side events in one property. Server-side events in another. Analyze them separately.
Test Server-Side Tracking Thoroughly
Server-side tracking is more reliable but still needs testing. Verify events reach your analytics platform. Verify data accuracy. Verify visitor attribution works.
Monitor for delays. Server-side events might have latency. It takes time for events to reach analytics. This is normal. But if latency increases, investigate.
Frequently asked questions
Is server-side tracking better than client-side?
Better for reliability. Worse for flexibility. Client-side can track anything on a page. Server-side can only track events your server knows about. Use both. Client-side for interactions. Server-side for confirmed events. With WEMASY's website builder, you can set this up directly on your website.
Do we need to remove client-side tracking if we implement server-side?
No. Keep both. They serve different purposes. Client-side tracks user behavior. Server-side confirms important events. Together they give complete data. Just prevent duplication.
How do we prevent duplicate events in server-side tracking?
Use event IDs. Every event gets a unique ID. If the same ID arrives twice, ignore the duplicate. Most analytics platforms support deduplication. Configure it.
Does server-side tracking require consent?
Yes. Server-side tracking still sends user data to analytics. If you require consent for analytics, you need consent for server-side too. Getting consent applies to both.
What if our server goes down? Does tracking stop?
Yes. If your server can't reach your analytics platform, events don't get sent. Build retry logic. If sending fails, retry later. This ensures data eventually reaches analytics.
Can we track offline events server-side?
Yes. That's one advantage of server-side tracking. If a purchase happens offline then syncs to your system, you can send it to analytics. Server-side doesn't require real-time user browser activity.