Analyze customer feedback sentiment with OpenAI, Google Sheets, and Slack

Quick overview This workflow receives customer feedback via a webhook, uses OpenAI to classify sentiment and extract topics, logs every result to Google Sheets, and posts an alert to Slack when feedback is negative.

How it works Receives a POST webhook request containing JSON feedback fields (for example, customer and feedback text). Extracts the feedback text and customer name and sends the text to OpenAI Chat Completions (gpt-4o-mini) to return structured sentiment analysis as JSON. Parses the OpenAI JSON response and formats the output fields (including joining topics into a comma-separated string). Appends each analyzed feedback entry to a Google Sheets worksheet. Checks whether the sentiment is negative and, if so, posts a formatted alert message to a Slack channel.

Setup Add an OpenAI API credential in n8n and select it in the OpenAI HTTP request step. Add a Google Sheets OAuth2 credential, then replace the Google Sheet URL/ID and ensure the target sheet (for example, Sheet1) has matching columns (customer, text, sentiment, score, topics, suggested_action). Add a Slack credential and set the target channel (for example, #customer-alerts) where negative-feedback alerts should be posted. Copy the production webhook URL from the webhook trigger and configure your form/survey/app to send POST requests to it with customer and feedback fields.

Additional info More ready-made business workflows: n8n Small-Business Automation Pack: https://opendataforge.gumroad.com/l/nuzbv