N8N Auto Comment Responder: AI-Powered YouTube Comment Replies

Engage with your audience automatically. This workflow monitors your videos for new comments and responds with AI-generated, personalized replies.

What This Workflow Does

• Hourly Monitoring: Checks for new comments every hour
• Smart Filtering: Ignores your own comments
• AI Responses: Generates contextual, friendly replies
• Auto-Post: Replies automatically on your behalf

Why Auto-Respond?

• 24/7 Engagement: Respond even while you sleep
• Faster Response Time: Viewers love quick replies
• Boost Algorithm: More comments = more reach
• Community Building: Make viewers feel valued

Prerequisites

• N8N instance
• YouTube API credentials with comment access
• OpenAI API key

Step-by-Step Setup

Step 1: Configure YouTube Trigger

• Add "YouTube" node (trigger mode)
• Set to poll for comment threads
• Filter by your video ID
• Poll every hour

Step 2: Filter Out Own Comments

• Add "Filter" node
• Condition:

- {{ $json.snippet.topLevelComment.snippet.authorDisplayName }}

- NOT EQUAL

- "YOUR_CHANNEL_NAME"

Step 3: Generate AI Reply

• Add "OpenAI" node
• Prompt:

Generate a friendly, helpful reply to this YouTube comment. 
Keep it short (1-2 sentences). 
Be authentic and engaging. 
Don't be overly promotional.

Comment: {{ $json.snippet.topLevelComment.snippet.textDisplay }}

• Set max_tokens to 100

Step 4: Post Reply

• Add "YouTube" node
• Resource: Comment
• Operation: Reply
• Parent ID: {{ $json.id }}
• Text: {{ $json.choices[0].message.content }}

Safety Features

• Rate Limiting: Don't reply more than 20 times per hour
• Sentiment Check: Skip negative/toxic comments
• Duplicate Prevention: Don't reply twice to same comment

Sample Interactions

Comment: "Great video! Very helpful for beginners."

AI Reply: "Thank you so much! I'm glad it helped. Let me know if you have any questions! 😄"

Comment: "Can you make a video about X topic?"

AI Reply: "Great suggestion! I'll definitely consider it for an upcoming video. Thanks for watching! 🙏"

Download the Workflow

Get this workflow from our N8N Workflows page.