How to make a Slack bot: Python vs low-code
Learn how to make a custom Slack bot with two approaches: using Python and n8n, a low-code workflow automation tool!
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Google Calendar and Slack integration
Save yourself the work of writing custom integrations for Google Calendar and Slack and use n8n instead. Build adaptable and scalable Productivity, Communication, and HITL workflows that work with your technology stack. All within a building experience you will love.
How to connect Google Calendar and Slack
- Step 1: Create a new workflow
- Step 2: Add and configure nodes
- Step 3: Connect
- Step 4: Customize and extend your integration
- Step 5: Test and activate your workflow
Step 1: Create a new workflow and add the first step
In n8n, click the "Add workflow" button in the Workflows tab to create a new workflow. Add the starting point – a trigger on when your workflow should run: an app event, a schedule, a webhook call, another workflow, an AI chat, or a manual trigger. Sometimes, the HTTP Request node might already serve as your starting point.
Step 2: Add and configure Google Calendar and Slack nodes
You can find Google Calendar and Slack in the nodes panel. Drag them onto your workflow canvas, selecting their actions. Click each node, choose a credential, and authenticate to grant n8n access. Configure Google Calendar and Slack nodes one by one: input data on the left, parameters in the middle, and output data on the right.
Step 3: Connect Google Calendar and Slack
A connection establishes a link between Google Calendar and Slack (or vice versa) to route data through the workflow. Data flows from the output of one node to the input of another. You can have single or multiple connections for each node.
Step 4: Customize and extend your Google Calendar and Slack integration
Use n8n's core nodes such as If, Split Out, Merge, and others to transform and manipulate data. Write custom JavaScript or Python in the Code node and run it as a step in your workflow. Connect Google Calendar and Slack with any of n8n’s 1000+ integrations, and incorporate advanced AI logic into your workflows.
Step 5: Test and activate your Google Calendar and Slack workflow
Save and run the workflow to see if everything works as expected. Based on your configuration, data should flow from Google Calendar to Slack or vice versa. Easily debug your workflow: you can check past executions to isolate and fix the mistake. Once you've tested everything, make sure to save your workflow and activate it.
Popular Google Calendar and Slack workflows
+3
Send AI pre-op reminders with Google Calendar, Gmail, Sheets, Slack and GPT-4o
📘 Description
This workflow automates end-to-end pre-surgery checklist reminders and confirmation tracking for healthcare operations teams. It ensures patients receive timely preparation instructions, can confirm completion with a single click, and allows staff to monitor confirmation status in real time—without manual coordination.
Every day at 9:00 AM, the workflow fetches surgery events from Google Calendar, extracts patient details from event descriptions, and generates a unique confirmation link for each patient. An AI assistant then creates a personalized, patient-friendly pre-op checklist email (subject + styled HTML body) that includes surgery details and a confirmation button.
When a patient clicks the confirmation link, a webhook captures the confirmation, updates Google Sheets as the source of truth, and records the timestamp. A separate periodic scheduler scans the sheet for patients who have not confirmed within the expected window. If confirmation is missing, the assigned nurse or owner is alerted in Slack with full patient and surgery context for immediate follow-up.
This creates a closed-loop system: reminder → confirmation capture → tracking → escalation.
⚙️ What This Workflow Does (Step-by-Step)
▶️ Daily 9:00 AM Trigger
Starts the pre-op reminder cycle automatically each morning.
📅 Fetch Today’s Surgery Events (Google Calendar)
Pulls calendar events and filters only surgery-related entries.
🧾 Extract Patient Details from Event Description
Parses patient name, email, phone, ID, procedure, and surgery time.
🔗 Generate Unique Confirmation Link
Creates a secure confirmUrl per patient with tracking parameters.
✉️ AI Email Generation (Subject + HTML Body)
Uses Azure OpenAI (gpt-4o) to generate a calm, professional checklist email with:
Surgery details
Basic preparation checklist
Green confirmation button linked to confirmUrl
📤 Send Pre-Op Reminder via Gmail
Delivers the styled HTML email directly to the patient.
✅ Confirmation Webhook (GET /confirm)
Captures patient clicks, parses query parameters, and marks the checklist as confirmed.
🧾 Upsert Confirmation Status (Google Sheets)
Stores and updates patient confirmation records as the operational source of truth.
⏳ Periodic Confirmation Check
Runs on a schedule to scan all patient rows for missing confirmations.
🚨 Slack Alert for Missing Confirmations
Notifies the nurse or owner with full patient context when confirmation is not received in time.
🧩 Prerequisites
• Google Calendar OAuth2
• Gmail OAuth2
• Azure OpenAI (gpt-4o) credentials
• Google Sheets OAuth2
• Slack API credentials
• Publicly accessible webhook URL for confirmation tracking
💡 Key Benefits
✔ Automated pre-op reminders at a fixed daily time
✔ Personalized AI-generated patient emails
✔ One-click confirmation tracking
✔ Google Sheets audit trail for operations
✔ Proactive Slack alerts for missing confirmations
✔ Reduced manual follow-ups and missed preparations
👥 Perfect For
Hospitals and surgical centers
Clinic operations teams
Care coordinators
Day-surgery facilities
Healthcare admin automation systems
Automate Employee Date Tracking & Reminders for HR with JavaScript
HR Date Management Automation - Complete Setup Guide
🎯 How It Works
This n8n workflow transforms your HR department from reactive to proactive by automatically monitoring 5 critical employee timelines and generating smart alerts before deadlines hit.
Core Components
Data Input → Employee information (hire dates, contracts, certifications)
Date Analysis Engine → Calculates days until critical events
Smart Categorization → Sorts employees by urgency level
Reminder Scheduler → Creates proactive notifications
Multi-Format Export → Sends alerts to your preferred systems
Business Value
Prevents compliance violations** ($5K-50K+ in fines)
Reduces HR workload** (15-20 hours/month saved)
Improves employee experience** (no missed reviews/renewals)
Provides management visibility** (dashboard reporting)
🚀 Quick Start Test
Import the Workflow
Download the Javascript_Hr.json file
Open n8n and click “Import from file”
Select the downloaded JSON file
Click “Import”
Test with Sample Data
Click the “Execute Workflow” button
Review the sample output in each node
Check the final export data format
What you’ll see:
5 sample employees with different scenarios
Calculated days until contract/certification expiry
Priority levels (high/medium/low)
Scheduled reminders with recipient emails
Export data in multiple formats
🔧 Real-World Integration Setup
Option 1: Google Sheets Integration (Most Popular)
Step 1: Prepare Your Employee Data
Create a Google Sheet with these columns:
| Employee ID | Name | Email | Department | Hire Date | Contract End | Certification Expiry | Last Review | Probation End | Vacation Days | Status |
Sample data format:
| 1 | John Smith | [email protected] | IT | 2024-01-15 | 2025-12-31 | 2025-03-20 | 2024-06-15 | 2024-07-15 | 20 | active |
Step 2: Replace Sample Data Generator
Delete the “Sample Data Generator” node
Add “Google Sheets” node
Connect to your Google account
Configure these settings:
Operation**: Read
Document**: Your employee spreadsheet
Sheet**: Employee data sheet
Range**: A1:K100 (adjust for your data size)
Options**: ✅ RAW data, ✅ Header row
Step 3: Map Your Data
Add a “Set” node after Google Sheets to standardize field names:
// Map your sheet columns to workflow format
{
"id": "{{ $json['Employee ID'] }}",
"name": "{{ $json['Name'] }}",
"email": "{{ $json['Email'] }}",
"department": "{{ $json['Department'] }}",
"hiredOn": "{{ $json['Hire Date'] }}",
"contractEndDate": "{{ $json['Contract End'] }}",
"certificationExpiry": "{{ $json['Certification Expiry'] }}",
"lastReviewDate": "{{ $json['Last Review'] }}",
"probationEndDate": "{{ $json['Probation End'] }}",
"vacationDays": "{{ $json['Vacation Days'] }}",
"status": "{{ $json['Status'] }}"
}
Option 2: HRIS Integration (BambooHR Example)
Step 1: BambooHR API Setup
Get your BambooHR API key from Settings > API Keys
Note your company subdomain (e.g., yourcompany.bamboohr.com)
Step 2: Replace Sample Data Generator
Delete the “Sample Data Generator” node
Add “HTTP Request” node
Configure these settings:
Method**: GET
URL**: https://api.bamboohr.com/api/gateway.php/[SUBDOMAIN]/v1/employees/directory
Authentication**: Basic Auth
Username**: Your API key
Password**: x (leave as ‘x’)
Headers**: Accept: application/json
Step 3: Transform BambooHR Data
Add a “Code” node to transform the API response:
// Transform BambooHR response to workflow format
const employees = [];
for (const employee of $input.all()) {
const emp = employee.json;
employees.push({
id: emp.id,
name: ${emp.firstName} ${emp.lastName},
email: emp.workEmail,
department: emp.department,
hiredOn: emp.hireDate,
contractEndDate: emp.terminationDate || "2025-12-31", // Default if not set
certificationExpiry: emp.customCertDate || "2025-12-31",
lastReviewDate: emp.customReviewDate || null,
probationEndDate: emp.customProbationDate || null,
vacationDays: emp.paidTimeOff || 20,
status: emp.employeeStatus || "active"
});
}
return employees.map(emp => ({ json: emp }));
Option 3: CSV File Upload
Step 1: Prepare CSV File
Create a CSV with the same structure as the Google Sheets format.
Step 2: Use CSV Parser
Replace “Sample Data Generator” with “Read Binary File” node
Add “CSV Parser” node
Configure settings:
Include Headers**: Yes
Delimiter**: Comma
Skip Empty Lines**: Yes
📧 Output Integration Setup
Email Notifications
Step 1: Add Email Node
Add “Email” node after “Reminder Scheduler”
Connect to your email provider (Gmail/Outlook)
Step 2: Configure Email Templates
// Dynamic email content based on reminder type
const reminder = $json;
const emailTemplates = {
contract_renewal: {
subject: 🚨 Contract Renewal Required - ${reminder.employeeName},
body: `
Hi HR Team,
${reminder.employeeName}'s contract expires on ${reminder.dueDate}.
Days remaining: ${Math.ceil((new Date(reminder.dueDate) - new Date()) / (10006060*24))}
Please initiate renewal process immediately.
Best regards,
HR Automation System
`
},
certification_renewal: {
subject: 📜 Certification Renewal Reminder - ${reminder.employeeName},
body: `
Hi ${reminder.employeeName},
Your certification expires on ${reminder.dueDate}.
Please renew your certification to maintain compliance.
Contact HR if you need assistance.
Best regards,
HR Team
`
}
};
const template = emailTemplates[reminder.type];
return {
to: reminder.recipientEmail,
subject: template.subject,
body: template.body
};
Slack Integration
Step 1: Add Slack Node
Add “Slack” node after “Advanced Date Filters”
Connect to your Slack workspace
Step 2: Configure Channel Alerts
// Send summary to #hr-alerts channel
const summary = $json.summary;
const message = `
🏢 Daily HR Report
👥 Total Employees: ${summary.totalEmployees}
🆕 New Hires: ${summary.newHires}
⚠️ High Priority Actions: ${summary.highPriority}
📋 Contracts Expiring: ${summary.contractsExpiring}
🎓 Certifications Expiring: ${summary.certificationsExpiring}
Generated: ${new Date().toLocaleDateString()}
`;
return {
channel: '#hr-alerts',
text: message
};
Google Calendar Integration
Step 1: Add Calendar Node
Add “Google Calendar” node after “Reminder Scheduler”
Connect to your Google account
Step 2: Create Calendar Events
// Create calendar events for upcoming deadlines
const reminder = $json;
const eventTitles = {
contract_renewal: Contract Renewal - ${reminder.employeeName},
certification_renewal: Certification Renewal - ${reminder.employeeName},
performance_review: Performance Review - ${reminder.employeeName},
probation_review: Probation Review - ${reminder.employeeName}
};
return {
calendarId: '[email protected]',
summary: eventTitles[reminder.type],
description: reminder.message,
start: {
dateTime: reminder.dueDate,
timeZone: 'America/New_York'
},
end: {
dateTime: reminder.dueDate,
timeZone: 'America/New_York'
},
attendees: [
{ email: '[email protected]' },
{ email: reminder.recipientEmail }
]
};
🎯 Scheduling & Automation
Daily Monitoring Setup
Step 1: Add Cron Trigger
Replace “Manual Trigger” with “Cron” node
Set schedule: 0 9 * * 1-5 (9 AM, Monday-Friday)
Configure timezone to your business hours
Step 2: Error Handling
Add “Error Trigger” node
Connect to email notification for failures
Set up retry logic for failed integrations
Weekly Reports
Step 1: Create Weekly Summary
Add separate “Cron” trigger for weekly reports
Set schedule: 0 9 * * 1 (9 AM every Monday)
Modify the filtering logic to show weekly trends
🔍 Customization Options
Adjust Alert Timings
In the “Date Analysis & Categorization” node:
// Modify these values to change alert timing
const isContractExpiringSoon = daysUntilContractEnd <= 90; // Change from 90 days
const isCertificationExpiringSoon = daysUntilCertificationExpiry <= 60; // Change from 60 days
const needsReview = daysSinceLastReview >= 365; // Change from 365 days
Add Custom Employee Categories
// Add new categories in the analysis node
const isContractor = employee.employeeType === 'contractor';
const isRemoteWorker = employee.location === 'remote';
const isHighRisk = employee.performanceRating === 'needs_improvement';
Custom Date Formats
Modify the “Date Formatting & Export” node to add your preferred formats:
// Add custom date format
const formatters = {
custom: (date) => {
const options = {
year: 'numeric',
month: 'long',
day: 'numeric',
weekday: 'long'
};
return date.toLocaleDateString('en-US', options);
}
};
🎚️ Testing & Validation
Step 1: Data Validation
Test with 2-3 sample employees first
Verify all dates are parsing correctly
Check that calculations match manual calculations
Step 2: Alert Testing
Create test scenarios with dates 30/60/90 days out
Verify emails are sent to correct recipients
Test Slack notifications in a test channel
Step 3: Performance Testing
Test with your full employee dataset
Monitor execution time (should be under 30 seconds)
Check for memory usage with large datasets
🆘 Troubleshooting Guide
Common Issues
Date Parsing Errors
// Add date validation in the analysis node
const parseDate = (dateStr) => {
const date = new Date(dateStr);
if (isNaN(date.getTime())) {
console.error(Invalid date: ${dateStr});
return null;
}
return date;
};
Missing Data Fields
// Add data validation
const validateEmployee = (employee) => {
const required = ['name', 'email', 'hiredOn'];
const missing = required.filter(field => !employee[field]);
if (missing.length > 0) {
console.error(Missing required fields for ${employee.name}: ${missing.join(', ')});
return false;
}
return true;
};
API Rate Limits
Add “Wait” nodes between API calls
Implement retry logic with exponential backoff
Cache API responses when possible
🚀 Advanced Features
Multi-Company Support
// Add company filtering in the analysis node
const processEmployeesByCompany = (employees, companyId) => {
return employees.filter(emp => emp.companyId === companyId);
};
Custom Notification Rules
// Advanced notification logic
const shouldNotify = (employee, eventType) => {
const rules = {
contract_renewal: employee.department !== 'intern',
certification_renewal: employee.role === 'certified_professional',
performance_review: employee.status === 'active'
};
return rules[eventType] || false;
};
Integration with Time Tracking
// Connect to time tracking APIs
const calculateWorkingDays = (startDate, endDate) => {
// Implementation for working days calculation
// Excluding weekends and holidays
};
This workflow transforms your HR department from reactive to proactive, preventing costly compliance issues while improving employee experience. The modular design allows you to start simple and add complexity as needed.
Sync Google Calendar events to Google Sheets with Slack notifications
Sync your Google Calendar events with Google Sheets and get daily Slack summaries with meeting statistics.
FEATURES:
Real-time sync of new and updated events
Auto-categorization (Meeting, 1:1, Interview, Demo, Focus Time)
Platform detection (Google Meet, Zoom, Teams)
Daily statistics dashboard
Cancellation tracking
Optional email notifications to attendees
FLOWS:
New Event: Log to Sheets + Slack notification + Optional email
Updated Event: Update Sheets + Slack notification
Canceled Event: Log cancellation + Slack alert
Daily Summary (8AM): Meeting time stats + Schedule to Slack
SETUP:
Connect Google account with Calendar access
Create Google Sheet with 3 tabs:
Events: ID, Synced At, Title, Category, Date, Day, Start Time, End Time, Duration, Platform, Attendees, Status, Meeting Link
Cancellations: ID, Canceled At, Title, Original Date, Original Time, Affected Attendees
Statistics: Date, Total Events, Meeting Time, Minutes, Busy %, Status, Virtual, In-Person
Replace YOUR_DOCUMENT_ID in all Sheets nodes
Connect Slack (#calendar, #errors channels)
Optional: Connect Gmail for attendee notifications
DAILY STATISTICS:
Total events count
Time spent in meetings
Busy percentage of work day
Virtual vs in-person breakdown
Full day schedule
IDEAL FOR:
Anyone wanting to track their calendar, analyze meeting patterns, or get daily schedule summaries on Slack.
+6
Predictive Health Monitoring & Alert System with GPT-4o-mini
How It Works
The system collects real-time wearable health data, normalizes it, and uses AI to analyze trends and risk scores. It detects anomalies by comparing with historical patterns and automatically triggers alerts and follow-up actions when thresholds are exceeded.
Setup Steps
Configure Webhook Endpoint - Set up webhook to receive data from wearable devices
Connect Database - Initialize storage for health metrics and historical data
Set Normalization Rules - Define data standardization parameters for different devices
Configure AI Model - Set up health score calculation and risk prediction algorithms
Define Thresholds - Establish alert triggers for critical health metrics
Connect Notification Channels - Configure email and Slack integrations
Set Up Reporting - Create automated report templates and schedules
Test Workflow - Run end-to-end tests with sample health data
Workflow Template
Webhook → Store Database → Normalize Data → Calculate Health Score → Analyze Metrics → Compare Previous → Check Threshold → Generate Reports/Alerts → Email/Slack → Schedule Follow-up
Workflow Steps
Ingest real-time wearable data via webhook, store and standardize it, and use GPT-4 for trend analysis and risk scoring. Monitor metrics against thresholds, trigger SMS, email, or Slack alerts, generate reports, and schedule follow-ups.
Setup Instructions
Configure webhook, database, GPT-4 API, notifications, calendar integration, and customize alert thresholds.
Prerequisites
Wearable API, patient database, GPT-4 key, email SMTP, optional Slack/Twilio, calendar integration.
Use Cases
Monitor glucose for diabetics, track elderly vitals/fall risk, assess corporate wellness, and post-surgery recovery alerts.
Customization
Adjust risk algorithms, add metrics, integrate telemedicine.
Benefits
Early intervention reduces readmissions and automates 80% of monitoring tasks.
+4
Automate Recruitment with GPT-4o-mini: CV Screening to Interview Scheduling in Airtable
Introduction
Automate candidate evaluation from CV submission to interview booking. Perfect for HR teams and recruiters.
How It Works
Webhook receives CVs, extracts Airtable data, AI assesses qualifications, filters candidates, sends emails, schedules Google Calendar interviews, and updates records.
Workflow Template
Webhook → Airtable (Get Data) → AI Extract CV → AI Assessment → Filter Qualified → Generate Email → Send Email → Filter Interview Candidates → Schedule Calendar → Update Airtable → Slack Notification → Respond
Workflow Steps
Receive & Store: Webhook receives CVs, saves to Airtable.
Fetch & Download: Gets job criteria, downloads CVs.
AI Assessment: Parses skills, scores candidates.
Filter & Email: Routes qualified, sends messages.
Schedule & Update: Books interviews, updates Airtable.
Notify: Alerts via Slack, confirms status.
Setup Instructions
Webhook & Airtable: Set URL, create tables, add credentials.
AI Configuration: Add OpenAI key, define schema, customize scoring.
Communication: Connect Gmail, Calendar, and Slack.
Prerequisites
Airtable account
OpenAI API key
Gmail and Google Calendar
Slack workspace (optional)
Customization
Multi-stage scheduling
ATS integration (Greenhouse, Lever)
Benefits
Reduces screening time by 90%
Ensures uniform evaluation
Cuts time-to-hire by 60%
Form to Meeting: Google Calendar, Zoom, Gmail & Slack Booking Automation
Who’s it for
Teams that collect meeting requests via a form and want instant, error-free scheduling: customer success, sales, education, agencies, and community managers.
How it works / What it does
This workflow ingests a form submission (name, email, preferred date/time), checks Google Calendar for conflicts, and branches automatically. If the slot is free, it creates a calendar event, spins up a Zoom meeting, emails the guest a confirmation, and posts a Slack summary to your team. If busy, it sends a polite “please pick another time” email. Time handling defaults to Asia/Tokyo and converts to ISO internally to keep downstream integrations consistent.
How to set up
Import the workflow and rename nodes for clarity if needed.
Open the Workflow Configuration (Set) node and adjust variables (calendar ID, meeting duration, Slack channel, sender info).
Map your form fields in Extract Booking Details.
Connect credentials in each service node (Google Calendar, Zoom, Gmail, Slack).
Test once with a real submission.
Requirements
Active accounts and n8n credentials for Google Calendar, Zoom, Gmail, and Slack.
A form or webhook source that sends name, email, and a valid datetime.
How to customize the workflow
Duration & buffers: Change end time calculation in Extract Booking Details.
Time zones: If you accept multiple time zones, normalize before building ISO strings.
Email copy: Personalize confirmation/alternative-time messages and add attachments if desired.
Slack format: Enrich the post with fields (host, Zoom join URL, internal tags).
Routing: Add CRM updates or reminders after the “slot free” branch.
Security note: No hardcoded API keys in HTTP nodes. Configure all credentials via n8n’s credential manager.
Load More Workflows
Build your own Google Calendar and Slack integration
Create custom Google Calendar and Slack workflows by choosing triggers and actions. Nodes come with global operations and settings, as well as app-specific parameters that can be configured. You can also use the HTTP Request node to query data from any app or service with a REST API.
Google Calendar and Slack integration details
Google Calendar
Google Calendar is a time-management and calendar service created by Google Workspace. It helps you schedule and organize events and meetings, send notifications, and synchronize with your team. It is widely used by both individuals and organizations.
Other integrations with Google Calendar
Other integrations with Slack
Google Calendar and Slack integration tutorials
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Learn about automating the process of calculating your meeting time every week to give you a better idea on how your week is spent.
FAQs
Can Google Calendar connect with Slack?
Can I use Google Calendar’s API with n8n?
Can I use Slack’s API with n8n?
Is n8n secure for integrating Google Calendar and Slack?
How to get started with Google Calendar and Slack integration in n8n.io?
Need help setting up your Google Calendar and Slack integration?
Discover our latest community's recommendations and join the discussions about Google Calendar and Slack integration.
Google Calendar free/busy times output is confusing the AI sometimes
jake chard
Hi all! I’m currently using this workflow to suggest 2 available times in a google calendar.
Currently I am just using the straight output from calendar node in the AI response, it gives the AI busy times.
(Here are t…
Channel : Join - Slack -> Internal Error
Nicolas N
Hi,
I create a channel and I try to add users to the Channel but I alway get the answer ‘Internal Error’
I do the same thing with the ‘Kick’ node and it works perfectly fine
Do you have any idea where does that comes …
Getting {"message":"Workflow was started"} message in Slack when triggering slash command via Webhook node
Muhammed Iqbal P B
Describe the problem
I build a slack bot with the help of n8n to send a modal(form) when someone use a slack command the web hook tigger and send the modal. But by sending the modal it sending a slack message
{"message"…
Slack - Retrieve Message + Thread
Nicolas N
Hi,
I am trying to retrieve a message and the thread in order to document them.
The workflow is quite simple :
I can have the message or one message of the thread but I am not able to get the thread and the message…
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