Shopify Low Stock & Out-of-Stock Discord Alerts via Webhook

High-Level Summary

This workflow provides real-time inventory monitoring for your Shopify store. When a product's inventory level changes (e.g., after a sale or manual update), Shopify sends a webhook to n8n. The workflow then analyzes the new stock level: if it's low (between 1 and 3 units) or completely out of stock (0 units), it fetches detailed product information (title, variant, image, and exact quantity) from Shopify's GraphQL API and sends a beautifully formatted alert to a Discord channel. This helps store owners and operations teams react instantly to stockouts or low-stock situations, preventing lost sales and improving customer satisfaction.

Step-by-Step Node Breakdown

1. Webhook — Receives the incoming HTTP POST request from Shopify when an inventory level is updated. (No auth – the webhook URL itself is the secret)

   • Parameters: Listens on path 5dc2467c-0b39-43e9-bdbd-399231f69c4e for POST requests. The webhook ID is auto-generated by n8n.

2. Code — Processes the raw webhook payload to extract and classify the inventory status. (No auth)

   • Parameters: JavaScript code extracts available (current stock count) and inventory_item_id from the incoming JSON body. It then calculates two boolean flags: low_inventory (true if stock is 1–3) and out_of_stock (true if stock is 0). These flags are passed downstream to the conditional nodes.

3. Low Inventory (IF node) — Routes the workflow based on whether the product has low stock. (No auth)

   • Parameters: Checks if $json.low_inventory equals true. If true, execution flows to the left output (the low-stock alert path).

4. Out of Stock (IF node) — Routes the workflow based on whether the product is sold out. (No auth)

   • Parameters: Checks if $json.out_of_stock equals true. If true, execution flows to the left output (the out-of-stock alert path).

5. GraphQL1 - shopify — Fetches detailed product data from Shopify for low-stock items. (Header Auth – uses a pre-configured credential with Shopify API token)

   • Parameters: Sends a GraphQL query to the endpoint defined in the environment variable API_BASE_URL (e.g., https://your-store.myshopify.com/admin/api/2023-01/graphql.json). The query retrieves the product title, variant title, inventory quantity, and the first product image URL using the inventoryItem ID passed from the Code node.

6. GraphQL - shopify — Same as node 5, but for out-of-stock items. (Header Auth)

   • Parameters: Identical GraphQL query and endpoint, triggered when the product is out of stock.

7. HTTP Request — Sends a low-stock alert to Discord. (Predefined Credential Type – uses a Discord webhook URL stored as a credential)

   • Parameters: POST method with a raw JSON body containing a Discord embed. The embed includes:
     • Title: Product name from Shopify
     • Description: "This product is running out of stock!"
     • Color: Yellow (hex 16776960)
     • Fields: Remaining inventory quantity and product variant name
     • Image: Product image from Shopify
     • Footer: "Alert from inventory management system"

8. HTTP Request1 — Sends an out-of-stock alert to Discord. (Predefined Credential Type)

   • Parameters: Same structure as node 7, but with a red color (16711680) and description "This product is sold out!"

Setup Instructions

1. Shopify Account: You need a Shopify store with admin access. Create a private app or use the Shopify Admin API to generate an access token with read_inventory and read_products scopes.
2. Discord: Create a Discord server (or use an existing one). Go to Server Settings → Integrations → Webhooks → Create a webhook. Copy the webhook URL.
3. n8n Credentials:
   • Create a Header Auth credential for Shopify: set the header name to X-Shopify-Access-Token and the value to your Shopify admin API token.
   • Create a Webhook URL credential for Discord: paste the Discord webhook URL as the credential value.
4. Environment Variables: Set API_BASE_URL in your n8n environment to your Shopify GraphQL endpoint (e.g., https://your-store.myshopify.com/admin/api/2023-01/graphql.json).
5. Shopify Webhook: In your Shopify admin, go to Settings → Notifications → Webhooks. Create a new webhook with:
   • Event: Inventory levels update
   • Format: JSON
   • URL: Your n8n webhook URL (the one generated by the Webhook node, e.g., https://your-n8n-instance.com/webhook/5dc2467c-0b39-43e9-bdbd-399231f69c4e)

Use Cases and Variations

• Multi-channel Alerts: Replace the Discord HTTP Request nodes with Slack, Microsoft Teams, or email (using n8n's built-in nodes) to send alerts to your preferred platform.
• Threshold Customization: In the Code node, adjust the lowInventory threshold (currently < 4) to any number (e.g., < 10 for high-volume items).
• Inventory Reports: Instead of sending individual alerts, accumulate low-stock items over a time window (using the n8n Wait node) and send a daily summary.
• Automated Reordering: Connect the out-of-stock branch to a purchase order system or a Google Sheets row to trigger automatic re-supply.
• Slack Integration: Use the Slack node instead of HTTP Request for richer Slack message formatting with buttons to reorder directly.
• Error Handling: The workflow already includes error-handler nodes (visible in the connections) – customize these to log errors to a separate channel or database.

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