Weekly Website Link Checker with Slack Alerts for Broken URLs

This n8n workflow automates the process of checking a list of website URLs for broken links and sends a Slack alert if any issues are found. It's designed to run on a schedule, ensuring your website's integrity is continuously monitored.

What it does

1. Schedules Checks: Triggers the workflow on a predefined schedule (e.g., weekly).
2. Defines URLs: Uses a Function node to define a list of URLs to be checked. You can easily modify this list to include all the important pages on your website.
3. Checks Each URL: Iterates through the list of URLs and performs an HTTP GET request for each one to check its status.
4. Identifies Broken Links: An If node checks the HTTP status code of each request. If the status code is not 2xx (indicating success), it's flagged as a broken link.
5. Sends Slack Alert: If any broken links are detected, a Slack message is composed with details of the broken URLs and sent to a specified Slack channel.
6. No Action for Success: If all links are working correctly, the workflow completes without sending any alerts.

Prerequisites/Requirements

• n8n Instance: A running n8n instance.
• Slack Account: A Slack workspace and a Slack App or Bot token configured as an n8n credential to post messages.

Setup/Usage

1. Import the Workflow:
   • Copy the provided JSON code.
   • In your n8n instance, click "New" in the workflows sidebar, then "Import from JSON".
   • Paste the JSON and click "Import".
2. Configure the Cron Trigger:
   • The "Cron" node (ID: 7) is currently set to a default schedule. Adjust its settings to your desired frequency (e.g., "Every Week" on a specific day and time).
3. Define Your URLs:
   • Open the "Function" node (ID: 14).
   • Edit the JavaScript code to include the URLs you want to check. The current structure expects an array of strings, like return [{ json: { url: 'https://example.com/page1' } }, { json: { url: 'https://example.com/page2' } }];.
4. Configure Slack Credentials:
   • Open the "Slack" node (ID: 40).
   • Click "Create New Credential" or select an existing Slack API credential.
   • Ensure the credential has the necessary permissions to post messages to your desired channel.
   • Specify the "Channel" where you want to receive alerts (e.g., #website-alerts).
5. Activate the Workflow:
   • Once configured, activate the workflow by toggling the "Active" switch in the top right corner of the n8n editor.

The workflow will now run on your defined schedule, automatically checking your website links and notifying you of any issues via Slack.