Instagram DM Automation With n8n: Build a Keyword-Based Auto-Reply Flow (2026)

Description and use

Automate Instagram DM replies using n8n: set up a keyword router, follow API rules, and enforce guardrails to avoid spam.

Problem

Automate Instagram direct message replies without using paid SaaS tools.

Outcome

The flow allows a business to automatically reply to common DM inquiries using keyword matching, reducing manual effort while staying within Instagram’s official API guidelines.

Workflow

• Connect Instagram to n8n via OAuth and a webhook or trigger node.
• Add a Switch node to route incoming messages based on keyword matches.
• Attach an Instagram send‑message node to each keyword branch to reply appropriately.
• Include a default fallback reply for unmatched messages.
• Add guardrails: per‑user message cap, human takeover path, and 24‑hour window compliance.
• Test the flow on a second account before deploying to real followers.

Evidence

Want Instagram DM automation without paying for another SaaS tool? Here’s how to wire up a keyword-based auto‑reply flow in n8n, step by step.

Source

An Instagram trigger fires when someone DMs you or comments with a keyword.

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A Switch node checks the message text for keywords like "price", "book", or "hours".

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Add a per‑user message cap. Track who you’ve replied to and don’t send more than one or two automated replies per person per day.

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Instagram’s messaging rules limit promotional messages to people who contacted you recently.

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