n8n SEO Audit: H1–H3 Heading Structure Checker w/ Slack

Keep your pages SEO-ready by automatically auditing H1–H3 heading structure—and reporting results to Slack.

This n8n workflow checks the heading structure of a list of URLs from Google Sheets, flags missing/duplicate/empty/orphaned H1–H3 issues, writes per-page results back to a “Heading Audit” tab, and posts a consolidated digest of issues and capture failures to Slack.

What this workflow does

• Runs weekly: scheduled every Monday at 7:00 AM.
• Reads URLs from Google Sheets: pulls url and label from a “Pages” sheet, processing one page at a time.
• Audits headings with Snapshot Site Analyze: calls Snapshot Site Analyze for each URL to extract page metadata and heading structure (with summary and quality flags disabled).
• Classifies results per page as:
  • OK
  • Issues (e.g., missing, duplicate, empty, orphaned headings, or no subheadings)
  • Failed to capture, including any capture error message
• Updates Google Sheets: appends or updates the audit row in the “Heading Audit” tab keyed by URL.
• Posts a consolidated report to Slack: lists pages with issues first (including H1/title mismatch notes) and includes any pages that could not be captured.

Use cases

• Run ongoing SEO audit checks for SaaS marketing pages and landing pages.
• Validate heading hierarchy after content migrations (and quickly spot orphaned or missing subheadings).
• Monitor technical SEO health for teams that manage updates via scheduled automation in n8n.

Technical details

• Schedule: weekly via n8n
• Nodes/stack: if, set, code, slack, sticky note, Google Sheets
• Snapshot integration: use the verified community node n8n-nodes-snapshot-site with Snapshot Site API credentials
• Google Sheets: OAuth credentials; “Pages” (columns: url, label) and “Heading Audit” (expected result columns)

Tip: ensure your “Pages” URLs include the scheme (e.g., https://example.com) so Snapshot Site Analyze can capture headings reliably.