Definition
The Google Analytics Data API provides programmatic access to GA4 data (properties, dimensions, metrics). For SEO, it allows extracting granular data on organic traffic: landing pages, engagement, conversions, user journeys, and audience segments. The v1 API supports standard reports (runReport), real-time reports (runRealtimeReport), and funnel reports. Key SEO dimensions include sessionSource, landingPage, firstUserMedium, and pagePath. The API enables creation of automated SEO dashboards, detection of behavior changes after a Google update, and cross-referencing GA4 data with Search Console data for a complete view of the SEO funnel. Access is via OAuth 2.0 or a service account.
Key Points
- Programmatic access to GA4 data for advanced SEO analysis
- Ability to cross-reference GA4 data with the GSC API
- Support for real-time and funnel reports
Practical Examples
Automated SEO dashboard
A script queries the GA4 API and GSC API weekly, cross-references data (GSC impressions + sessions + GA4 conversions by landing page) and generates an automatic report sent by email.
Core Update impact analysis
After a Google Core Update, an SEO uses the GA4 API to compare engagement metrics (session duration, bounce rate, events) before/after the update, by page type, to identify impacted pages.
Frequently Asked Questions
Key data includes: organic traffic by page, bounce rate, session duration, conversions by source, user journey, and custom events. By filtering by sessionSource = 'google' and sessionMedium = 'organic', you isolate SEO data.
Yes, the API is free with generous quotas. Limits are 10,000 requests per day per project and 10 concurrent requests. For most SEO needs, these quotas are more than sufficient.
Go Further with LemmiLink
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Last updated: 2026-02-07