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Monitor negative customer reviews with an HTTP API, Google Sheets and Slack

by Redowan Ahmed Farhanadapted from n8n official workflow galleryUpdated Aug 2026
RequiresCCodeGoogle SheetsGoogle SheetsHTTP RequestHTTP RequestSlack
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ScEvery 6 HoursHRFetch Latest ReviewsFetch Latest Re…SeNormalize Review DataNormalize Revie…CoFilter Negative ReviewsFilter Negative…Get Processed Review IDsGet Processed R…MeCombine Reviews and LogCombine Reviews…CoFilter Out Already ProcessedFilter Out Alre…IfAny New Negative ReviewsAny New Negativ…IfClassify SeverityClassify Severi…Alert Manager UrgentAlert Manager U…Log Critical ReviewLog Critical Re…Alert Manager StandardAlert Manager S…Log Standard ReviewLog Standard Re…ErWorkflow Error TriggerWorkflow Error …Alert Team on Monitor FailureAlert Team on M…12345678910111213
1/5
FLOWS
STEPS · 13
Runs on a schedule

Quick Overview This workflow polls your review API every 6 hours, filters for reviews rated 3 stars or lower, and posts an alert to a Slack channel for each negative review. How it works Runs every 6 hours on a schedule. Fetches the latest reviews from a configured HTTP endpoint. Filters the returned items to keep only reviews with a rating of 3 or below. Checks whether any negative reviews were found and stops if none exist. Posts each negative review to a selected Slack channel with the rating, author, and review text. Setup Provide a reviews API endpoint (and any required authentication) in the HTTP Request node. Connect Slack using an OAuth2 credential. Select the target Slack channel and adjust the rating threshold in the filter logic if you want a stricter or looser definition of “negative”.

Tags

n8nreference-onlygoogle-sheetsslack
Connects
CCodesheetsGoogle SheetsWHTTP RequestSlack
CategoryGoogle Sheets
Triggermanual
Complexitycomplex
Nodes15
AddedJun 17, 2026

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