HubSpot CRM Duplicate Detection & Scoring with Slack Reports (n8n)

Find and fix HubSpot CRM duplicates—automatically, with confidence scores and Slack reports

This n8n sub-workflow scans your HubSpot CRM (contacts, companies, or deals), detects potential duplicates, scores and explains matches using configurable rules, and then routes them for auto-merge, human approval, or logging—while posting a clear summary to Slack.

What this workflow does

Built for deduplication reliability, the workflow:

• Receives input from an orchestrator workflow with an object type (contacts, companies, or deals) and deduplication settings.
• Pages through HubSpot CRM search results in ascending last-modified order, throttling requests and accumulating records up to a configurable cap.
• Normalizes key fields (e.g., email, phone, domain, names, and deal attributes), generates blocking keys, and evaluates candidate pairs.
• Scores matches with a confidence score and a reason list based on your rules.
• Selects a primary record per pair (for example, choosing the most complete or oldest record), and groups exact-match clusters for safe transitive merging.
• Routes results: high-confidence pairs go to a merge sub-workflow, medium-confidence pairs go to an approval sub-workflow, and low-confidence/deferred pairs are left as log-only.
• Summarizes the run (scan statistics and top remaining pairs), optionally posts a duplicate report to Slack, and returns a compact run summary to the calling workflow.

Use cases

• Clean up HubSpot CRM lists before campaign launches to prevent duplicate outreach.
• Run recurring deduplication after imports or list syncs, with Slack visibility for operations teams.
• Balance automation and safety by sending borderline matches for human approval.

Technical details

• Integrations: HubSpot CRM (Private App Token with search/read access), Slack (OAuth2 for report posting)
• n8n node types mentioned: if, code, no op, wait, slack, switch

Ideal for: n8n users, automation engineers, and SaaS operators managing HubSpot data quality with traceable deduplication and Slack reporting.