Alex Pekler This workflow corresponds to n8n.io template #13482 — we link there as the canonical source.
This workflow follows the Google Calendar → HTTP Request recipe pattern — see all workflows that pair these two integrations.
The workflow JSON
Copy or download the full n8n JSON below. Paste it into a new n8n workflow, add your credentials, activate. Full import guide →
{
"meta": {
"templateCredsSetupCompleted": true
},
"name": "Send WhatsApp Appointment Reminders from Google Calendar with MoltFlow",
"tags": [
{
"name": "whatsapp"
},
{
"name": "google calendar"
},
{
"name": "appointments"
},
{
"name": "moltflow"
},
{
"name": "reminders"
}
],
"nodes": [
{
"id": "h1000001-0000-4000-0800-000000000010",
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"position": [
-40,
-300
],
"parameters": {
"color": 4,
"width": 400,
"height": 300,
"content": "## Calendar \u2192 WhatsApp Reminders\nAutomatically send WhatsApp reminders for upcoming appointments from your Google Calendar using [MoltFlow](https://molt.waiflow.app).\n\n**How it works:**\n1. Runs every hour and checks your Google Calendar\n2. Finds appointments happening in the next 24 hours\n3. Extracts client phone numbers from event descriptions\n4. Sends a personalized WhatsApp reminder via MoltFlow"
},
"typeVersion": 1
},
{
"id": "h1000001-0000-4000-0800-000000000011",
"name": "Sticky Note1",
"type": "n8n-nodes-base.stickyNote",
"position": [
420,
-300
],
"parameters": {
"color": 5,
"width": 400,
"height": 270,
"content": "## Setup (5 min)\n1. Create a [MoltFlow account](https://molt.waiflow.app) and connect WhatsApp\n2. Connect Google Calendar OAuth2 credential\n3. Set your calendar ID (default: primary)\n4. Set `YOUR_SESSION_ID` in the Format Reminders node\n5. Add MoltFlow API Key: Header Auth \u2192 `X-API-Key`\n\n**Format:** Add client phone to calendar event description:\n`Phone: 1234567890`"
},
"typeVersion": 1
},
{
"id": "h1000001-0000-4000-0800-000000000001",
"name": "Every Hour",
"type": "n8n-nodes-base.scheduleTrigger",
"position": [
0,
0
],
"parameters": {
"rule": {
"interval": [
{
"field": "hours",
"hoursInterval": 1
}
]
}
},
"typeVersion": 1.2
},
{
"id": "h1000001-0000-4000-0800-000000000002",
"name": "Get Upcoming Events",
"type": "n8n-nodes-base.googleCalendar",
"position": [
220,
0
],
"parameters": {
"options": {
"timeMax": "={{ $now.plus({ hours: 24 }).toISO() }}",
"timeMin": "={{ $now.toISO() }}",
"singleEvents": true
},
"operation": "getAll",
"returnAll": true,
"calendarId": {
"__rl": true,
"mode": "list",
"value": "primary"
}
},
"credentials": {
"googleCalendarOAuth2Api": {
"name": "<your credential>"
}
},
"typeVersion": 1.2
},
{
"id": "h1000001-0000-4000-0800-000000000003",
"name": "Format Reminders",
"type": "n8n-nodes-base.code",
"position": [
440,
0
],
"parameters": {
"mode": "runOnceForAllItems",
"jsCode": "const SESSION_ID = 'YOUR_SESSION_ID';\n\nconst events = $input.all();\nconst reminders = [];\n\nfor (const event of events) {\n const data = event.json;\n const summary = data.summary || 'Appointment';\n const description = data.description || '';\n const startTime = data.start && (data.start.dateTime || data.start.date) || '';\n\n const phoneMatch = description.match(/(?:phone|tel|mobile|whatsapp)[:\\\\s]*([+]?[0-9\\\\s-]{7,20})/i)\n || description.match(/([+]?[0-9]{7,15})/);\n\n if (!phoneMatch) continue;\n\n const phone = phoneMatch[1].replace(/[^0-9]/g, '');\n if (phone.length < 7) continue;\n\n const nameMatch = description.match(/(?:name|client|patient)[:\\\\s]*([^\\\\n]+)/i);\n const clientName = nameMatch\n ? nameMatch[1].trim()\n : (data.attendees && data.attendees.length > 0\n ? data.attendees[0].displayName || data.attendees[0].email\n : 'there');\n\n let timeStr = startTime;\n try {\n const d = new Date(startTime);\n timeStr = d.toLocaleTimeString('en-US', { hour: '2-digit', minute: '2-digit', hour12: true });\n } catch(e) {}\n\n const message = `Hi ${clientName}! Just a reminder about your appointment: ${summary} tomorrow at ${timeStr}. Reply YES to confirm or let us know if you need to reschedule.`;\n\n reminders.push({\n json: {\n session_id: SESSION_ID,\n chat_id: phone + '@c.us',\n message: message,\n client_name: clientName,\n event_name: summary,\n event_time: startTime\n }\n });\n}\n\nif (reminders.length === 0) {\n return [{ json: { status: 'no_reminders', message: 'No upcoming appointments with phone numbers found' } }];\n}\n\nreturn reminders;"
},
"typeVersion": 2
},
{
"id": "h1000001-0000-4000-0800-000000000004",
"name": "Has Reminder?",
"type": "n8n-nodes-base.if",
"position": [
660,
0
],
"parameters": {
"conditions": {
"options": {
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "has-chat-id",
"operator": {
"type": "string",
"operation": "exists"
},
"leftValue": "={{ $json.chat_id }}",
"rightValue": ""
}
]
}
},
"typeVersion": 2
},
{
"id": "h1000001-0000-4000-0800-000000000005",
"name": "Send WhatsApp Reminder",
"type": "n8n-nodes-base.httpRequest",
"position": [
880,
-100
],
"parameters": {
"url": "https://apiv2.waiflow.app/api/v2/messages/send",
"method": "POST",
"options": {},
"jsonBody": "={{ JSON.stringify({ session_id: $json.session_id, chat_id: $json.chat_id, message: $json.message }) }}",
"sendBody": true,
"specifyBody": "json",
"authentication": "genericCredentialType",
"genericAuthType": "httpHeaderAuth"
},
"credentials": {
"httpHeaderAuth": {
"name": "<your credential>"
}
},
"typeVersion": 4.2
},
{
"id": "h1000001-0000-4000-0800-000000000006",
"name": "Log Results",
"type": "n8n-nodes-base.code",
"position": [
1100,
-100
],
"parameters": {
"mode": "runOnceForAllItems",
"jsCode": "const items = $input.all();\nconst results = items.map(item => ({\n status: 'sent',\n client: item.json.client_name || $('Format Reminders').first().json.client_name,\n event: $('Format Reminders').first().json.event_name\n}));\nreturn [{ json: { summary: 'Sent ' + results.length + ' appointment reminder(s)', results } }];"
},
"typeVersion": 2
}
],
"settings": {
"executionOrder": "v1"
},
"connections": {
"Every Hour": {
"main": [
[
{
"node": "Get Upcoming Events",
"type": "main",
"index": 0
}
]
]
},
"Has Reminder?": {
"main": [
[
{
"node": "Send WhatsApp Reminder",
"type": "main",
"index": 0
}
],
[]
]
},
"Format Reminders": {
"main": [
[
{
"node": "Has Reminder?",
"type": "main",
"index": 0
}
]
]
},
"Get Upcoming Events": {
"main": [
[
{
"node": "Format Reminders",
"type": "main",
"index": 0
}
]
]
},
"Send WhatsApp Reminder": {
"main": [
[
{
"node": "Log Results",
"type": "main",
"index": 0
}
]
]
}
}
}
Credentials you'll need
Each integration node will prompt for credentials when you import. We strip credential IDs before publishing — you'll add your own.
googleCalendarOAuth2ApihttpHeaderAuth
For the full experience including quality scoring and batch install features for each workflow upgrade to Pro
About this workflow
Automatically sends WhatsApp reminders for upcoming appointments from your Google Calendar using MoltFlow (https://molt.waiflow.app). Perfect for clinics, salons, consultants, and any appointment-based business. Runs every hour and checks your Google Calendar for the next 24…
Source: https://n8n.io/workflows/13482/ — original creator credit. Request a take-down →
Related workflows
Workflows that share integrations, category, or trigger type with this one. All free to copy and import.
Who’s it for
Transform your morning routine with an automated personal assistant that delivers everything you need to know directly to WhatsApp. This workflow aggregates live data from multiple sources and uses Op
This n8n template demonstrates how to automatically fetch upcoming movie releases from TMDB and let users add selected movies to their Google Calendar directly from Telegram. On a daily schedule, the
Busy professionals who want a quick daily update combining their calendar, weather, and top news.
Sync Discord Scheduled Events To Google Calendar. Uses httpRequest, scheduleTrigger, googleCalendar, stickyNote. Scheduled trigger; 9 nodes.