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Optimize Instagram hashtags with GPT-4o & real engagement data via Graph API

Shun NakayamaShun Nakayama
129 views
2/3/2026
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Instagram Hashtag Generator Workflow

This workflow automatically generates optimal hashtags for your Instagram posts by analyzing captions and fetching real-time engagement data.

Key Features

  • 100% Official API & Free: Uses ONLY the official Instagram Graph API. No expensive third-party tools or risky scraping methods are required.
  • Safe & Reliable: Relying on the official API ensures compliance and long-term stability.
  • Smart Caching: Includes a Google Sheets caching mechanism to maximize the value of the official API's rate limits (30 searches/7 days).

Workflow Overview

  1. Caption Input: Set your caption manually or via a workflow trigger.
  2. AI Suggestions: GPT-4o-mini analyzes the caption and suggests 10 relevant hashtags, balancing popular (big words) and niche keywords.
  3. Official API Search (Instagram Graph API):
    • Fetches Hashtag IDs using the ig_hashtag_search endpoint.
    • Retrieves engagement metrics (Average Likes, Average Comments) using the ID.
  4. Selection & Sorting:
    • Sorts candidates by engagement metrics.
    • Selects the top 5 most effective hashtags that balance relevance and engagement.
  5. Output: Returns the final list of hashtags as text.

Setup Steps

  1. Import to n8n:

    • Copy the content of workflow_hashtag_generator.json and paste it into your n8n canvas, or import the file directly.

  2. Credentials:

    • OpenAI account: Connect your OpenAI credentials.
    • Facebook Graph account: Connect your Facebook Graph API credentials.

  3. Configuration:

    • Instagram Business ID: Update the YOUR_INSTAGRAM_BUSINESS_ACCOUNT_ID placeholder in the Get Hashtag Info and Get Hashtag Metrics nodes with your actual Business Account ID.
    • Google Spreadsheet ID: Update the YOUR_SPREADSHEET_ID placeholder in the Fetch Cached Hashtags and Save to Cache nodes.

  4. Adjustments:

    • Filter Logic: You can adjust the sorting or filtering logic in the Aggregate & Rank Candidates node's JavaScript code (e.g., exclude tags with fewer than 1000 posts) if needed.

Important Notes on API Limits

The official Instagram Hashtag Search API (ig_hashtag_search) allows for 30 unique hashtag queries per rolling 7-day period.

  • Why this is fine: This workflow caches results in Google Sheets. Once a tag is fetched, it doesn't need to be queried again for a while, allowing you to build up a large database of tags over time without hitting the limit.
  • Recommendation: Use mock data during initial testing to save your API quota.

Optimize Instagram Hashtags with GPT-4o & Real Engagement Data

This n8n workflow automates the process of optimizing Instagram hashtags by leveraging real engagement data from the Facebook Graph API and generating new hashtag suggestions using GPT-4o. It helps content creators and marketers improve their Instagram reach and engagement by providing data-driven hashtag recommendations.

What it does

  1. Triggers Manually: The workflow is initiated manually.
  2. Fetches Instagram Posts: It retrieves a list of your recent Instagram posts using the Facebook Graph API.
  3. Filters Posts for Analysis: It filters these posts, typically focusing on those with specific criteria (e.g., recent posts, posts with certain engagement levels).
  4. Extracts Relevant Data: For each filtered post, it extracts engagement metrics (likes, comments, shares, saves) and the hashtags used.
  5. Calculates Engagement Score: A custom JavaScript code node calculates an "engagement score" for each post based on its metrics. This score helps quantify the performance of the used hashtags.
  6. Prepares Data for GPT-4o: The workflow structures the post data, including original hashtags and their engagement scores, into a format suitable for an LLM prompt.
  7. Generates Hashtag Suggestions with GPT-4o: It sends the prepared data to the OpenAI Chat Model (GPT-4o via a Basic LLM Chain) to generate new, optimized hashtag suggestions based on the performance of the existing ones.
  8. Merges Data: The original post data is merged with the newly generated hashtag suggestions.
  9. Updates Google Sheet (Optional/Placeholder): The workflow includes a Google Sheets node, which could be used to log the analyzed data, engagement scores, and new hashtag suggestions for further analysis or record-keeping.
  10. Loops for Batch Processing: The workflow is designed to process items in batches, allowing for efficient handling of multiple Instagram posts.
  11. Introduces a Delay: A Wait node is included, likely to prevent API rate limiting issues when interacting with external services.

Prerequisites/Requirements

  • n8n Instance: A running n8n instance.
  • Facebook Graph API Credentials: Access to the Facebook Graph API with permissions to read Instagram business account insights and posts. This requires a Facebook Developer account and an Instagram Business Account linked to a Facebook Page.
  • OpenAI API Key: An API key for OpenAI (specifically for GPT-4o).
  • Google Sheets Account (Optional): A Google account with access to Google Sheets if you intend to use the data logging functionality.

Setup/Usage

  1. Import the Workflow: Download the provided JSON and import it into your n8n instance.
  2. Configure Credentials:
    • Facebook Graph API: Set up a new "Facebook Graph" credential. You will need to authenticate with your Facebook account and grant the necessary permissions for your Instagram Business Account.
    • OpenAI Chat Model: Set up a new "OpenAI Chat Model" credential with your OpenAI API Key.
    • Google Sheets (Optional): Set up a "Google Sheets" credential if you plan to use this node.
  3. Review Node Configurations:
    • Facebook Graph API: Ensure the "Resource" and "Operation" are correctly set to fetch Instagram posts and their insights. You might need to specify the Instagram Business Account ID.
    • Code Node: Review the JavaScript code to understand how the engagement score is calculated. Adjust the weights for likes, comments, shares, and saves if needed to reflect your engagement priorities.
    • Basic LLM Chain (OpenAI Chat Model): Examine the prompt used to instruct GPT-4o. Customize it to guide the AI in generating the most relevant hashtag suggestions for your content and audience.
    • Google Sheets (Optional): Configure the spreadsheet ID and sheet name where you want to log the data.
  4. Execute the Workflow: Click the "Execute Workflow" button in the n8n editor to run the workflow manually.

This workflow provides a powerful foundation for data-driven Instagram hashtag optimization, combining real performance metrics with advanced AI suggestions.

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