Un tal Camilo Medina This workflow corresponds to n8n.io template #3953 — we link there as the canonical source.
This workflow follows the Emailsend → Form Trigger recipe pattern — see all workflows that pair these two integrations.
The workflow JSON
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{
"id": "bWbwE1qVduRTdWmc",
"name": "\ud83d\udd10 Double Opt-In Email Verification System with Google Sheets",
"tags": [
{
"id": "2E1hRaAa0axOUCXV",
"name": "UTCM",
"createdAt": "2025-05-08T22:11:01.814Z",
"updatedAt": "2025-05-08T22:11:01.814Z"
},
{
"id": "GZT3Cgu3i4As1Giz",
"name": "Doble-OptIn",
"createdAt": "2025-05-08T22:10:58.928Z",
"updatedAt": "2025-05-08T22:10:58.928Z"
},
{
"id": "UZnyfKrtC83mHOyK",
"name": "Forms",
"createdAt": "2025-05-08T22:10:50.602Z",
"updatedAt": "2025-05-08T22:10:50.602Z"
}
],
"nodes": [
{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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"parameters": {
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{
"id": "2a429ebd-460c-4a33-bc57-7576e31e1fea",
"name": "Continue With Your Flow",
"type": "n8n-nodes-base.noOp",
"position": [
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"parameters": {},
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{
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"parameters": {
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],
"active": false,
"settings": {
"executionOrder": "v1"
},
"versionId": "5ace2a5e-1f6c-4c13-a069-d71dcb22ee1d",
"connections": {
"Main Form": {
"main": [
[
{
"node": "Continue With Your Flow",
"type": "main",
"index": 0
}
]
]
},
"Check Code": {
"main": [
[
{
"node": "Main Form",
"type": "main",
"index": 0
}
],
[
{
"node": "Incorrect Code Form",
"type": "main",
"index": 0
}
]
]
},
"Email Form": {
"main": [
[
{
"node": "Generate Code",
"type": "main",
"index": 0
}
]
]
},
"Reset Form": {
"main": [
[
{
"node": "Email Form",
"type": "main",
"index": 0
}
]
]
},
"Send Email": {
"main": [
[
{
"node": "Verification Form",
"type": "main",
"index": 0
}
]
]
},
"Store Data": {
"main": [
[
{
"node": "Send Email",
"type": "main",
"index": 0
}
]
]
},
"Second Check": {
"main": [
[
{
"node": "Main Form",
"type": "main",
"index": 0
}
],
[
{
"node": "Reset Form",
"type": "main",
"index": 0
}
]
]
},
"Generate Code": {
"main": [
[
{
"node": "Store Data",
"type": "main",
"index": 0
}
]
]
},
"Verification Form": {
"main": [
[
{
"node": "Check Code",
"type": "main",
"index": 0
}
]
]
},
"On form submission": {
"main": [
[
{
"node": "Email Form",
"type": "main",
"index": 0
}
]
]
},
"Incorrect Code Form": {
"main": [
[
{
"node": "Second Check",
"type": "main",
"index": 0
}
]
]
}
}
}
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About this workflow
This template implements a professional Double Opt-In email verification system using Google Sheets as a database. The workflow collects user emails, generates unique verification codes, stores them securely, and validates user access before proceeding with your main form. User…
Source: https://n8n.io/workflows/3953/ — original creator credit. Request a take-down →
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