This workflow follows the Gmail → Google Sheets 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 →
{
"updatedAt": "2026-03-30T13:14:26.965Z",
"createdAt": "2026-03-30T13:14:26.965Z",
"id": "HDlrxGe1GI2uGKBV",
"name": "OTP Verification System",
"description": null,
"active": true,
"isArchived": false,
"nodes": [
{
"id": "wh-send",
"name": "Receive OTP Request",
"type": "n8n-nodes-base.webhook",
"typeVersion": 2,
"position": [
0,
300
],
"parameters": {
"httpMethod": "POST",
"path": "send-otp",
"responseMode": "responseNode",
"options": {}
}
},
{
"id": "code-gen",
"name": "Validate and Generate OTP",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"position": [
220,
300
],
"parameters": {
"jsCode": "const body = $input.first().json.body || $input.first().json;\nconst email = (body.email || '').trim().toLowerCase();\nconst name = (body.name || 'User').trim();\nconst purpose = body.purpose || 'verify';\nconst emailRegex = /^[^\\s@]+@[^\\s@]+\\.[^\\s@]+$/;\nif (!emailRegex.test(email)) { return [{ json: { valid: false, error: 'Invalid email address format', email, name, purpose } }]; }\nconst otp = Math.floor(100000 + Math.random() * 900000).toString();\nconst sessionId = 'OTP_' + Date.now() + '_' + Math.random().toString(36).substring(2, 8).toUpperCase();\nconst now = new Date();\nconst expiryTime = new Date(now.getTime() + 10 * 60 * 1000);\nconst purposeText = { login: 'log in to your account', signup: 'complete your registration', reset_password: 'reset your password', verify: 'verify your identity' }[purpose] || 'verify your identity';\nreturn [{ json: { valid: true, email, name, purpose, purpose_text: purposeText, otp, session_id: sessionId, generated_at: now.toISOString(), expiry_time: expiryTime.toISOString(), expiry_minutes: 10, attempts: 0 } }];"
}
},
{
"id": "if-valid",
"name": "Is Email Valid",
"type": "n8n-nodes-base.if",
"typeVersion": 2,
"position": [
440,
300
],
"parameters": {
"conditions": {
"options": {
"caseSensitive": true,
"leftValue": "",
"typeValidation": "strict"
},
"conditions": [
{
"id": "c1",
"leftValue": "={{ $json.valid }}",
"rightValue": true,
"operator": {
"type": "boolean",
"operation": "equals"
}
}
],
"combinator": "and"
}
}
},
{
"id": "shape-otp-log",
"name": "Shape OTP Log Data",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"position": [
660,
200
],
"parameters": {
"jsCode": "return [{ json: { 'Timestamp': $json.generated_at, 'Email': $json.email, 'OTP Code': $json.otp, 'OTP Sent At': $json.generated_at, 'Verified At': 'Pending', 'Status': 'Sent', 'Attempts': 0, 'IP Address': '', 'Session ID': $json.session_id, 'Expiry Time': $json.expiry_time, _email: $json.email, _name: $json.name, _otp: $json.otp, _session_id: $json.session_id, _purpose_text: $json.purpose_text, _expiry_minutes: $json.expiry_minutes, _generated_at: $json.generated_at, _expiry_time: $json.expiry_time } }];"
}
},
{
"id": "log-otp",
"name": "Log OTP to Sheets",
"type": "n8n-nodes-base.googleSheets",
"typeVersion": 4.5,
"position": [
880,
200
],
"credentials": {
"googleSheetsOAuth2Api": {
"name": "<your credential>"
}
},
"parameters": {
"operation": "append",
"documentId": {
"__rl": true,
"value": "1NUwfMYpOXuLI8ysTM0_siFxIL-jgNUGjFAD5AH2U-MY",
"mode": "id"
},
"sheetName": {
"__rl": true,
"value": "OTP_Log",
"mode": "name"
},
"columns": {
"mappingMode": "autoMapInputData",
"value": {},
"matchingColumns": [],
"schema": []
},
"options": {}
}
},
{
"id": "respond-success",
"name": "Send OTP Success Response",
"type": "n8n-nodes-base.respondToWebhook",
"typeVersion": 1.1,
"position": [
1100,
200
],
"parameters": {
"respondWith": "json",
"responseBody": "={{ JSON.stringify({ success: true, message: 'OTP sent successfully to ' + $json._email, session_id: $json._session_id, expires_in_minutes: 10, hint: 'Check your email inbox and spam folder' }) }}",
"options": {
"responseCode": 200
}
}
},
{
"id": "send-email",
"name": "Send OTP Email",
"type": "n8n-nodes-base.gmail",
"typeVersion": 2.1,
"position": [
1320,
200
],
"credentials": {
"gmailOAuth2": {
"name": "<your credential>"
}
},
"parameters": {
"sendTo": "={{ $json._email }}",
"subject": "={{ $json._otp + ' is your verification code' }}",
"emailType": "html",
"message": "={{ '<!DOCTYPE html><html><head><meta charset=\"UTF-8\"></head><body style=\"margin:0;padding:0;background:#f4f4f4;font-family:Arial,sans-serif\"><table width=\"100%\" cellpadding=\"0\" cellspacing=\"0\" style=\"background:#f4f4f4;padding:40px 20px\"><tr><td align=\"center\"><table width=\"560\" cellpadding=\"0\" cellspacing=\"0\" style=\"background:#ffffff;border-radius:16px;overflow:hidden;box-shadow:0 4px 20px rgba(0,0,0,0.08)\"><tr><td style=\"background:linear-gradient(135deg,#1a1a2e,#16213e);padding:32px;text-align:center\"><h1 style=\"color:#ffffff;margin:0;font-size:24px;font-weight:700\">Verification Code</h1><p style=\"color:#8892a4;margin:8px 0 0;font-size:14px\">One-time password for ' + $json._purpose_text + '</p></td></tr><tr><td style=\"padding:40px 40px 24px\"><p style=\"color:#333;font-size:16px;margin:0 0 8px\">Hello <strong>' + $json._name + '</strong>,</p><p style=\"color:#555;font-size:15px;line-height:1.6;margin:0 0 32px\">Here is your one-time verification code. This code is valid for <strong>' + $json._expiry_minutes + ' minutes</strong>.</p><div style=\"background:#f8f9ff;border:2px dashed #7c4dff;border-radius:12px;padding:28px;text-align:center;margin:0 0 28px\"><p style=\"color:#888;font-size:12px;text-transform:uppercase;letter-spacing:2px;margin:0 0 12px\">Your OTP Code</p><div style=\"font-size:48px;font-weight:800;letter-spacing:12px;color:#1a1a2e;font-family:monospace\">' + $json._otp + '</div><p style=\"color:#888;font-size:13px;margin:12px 0 0\">Expires in ' + $json._expiry_minutes + ' minutes</p></div><div style=\"background:#fff3e0;border-left:4px solid #ff9800;border-radius:0 8px 8px 0;padding:16px;margin:0 0 28px\"><p style=\"margin:0;color:#e65100;font-size:13px;line-height:1.6\"><strong>Security notice:</strong> Never share this code with anyone.</p></div><p style=\"color:#999;font-size:12px;line-height:1.6;margin:0\">Session ID: ' + $json._session_id + '<br>Valid until: ' + new Date($json._expiry_time).toLocaleString() + '</p></td></tr><tr><td style=\"background:#f8f9fa;padding:20px 40px;text-align:center;border-top:1px solid #e8e8e8\"><p style=\"color:#999;font-size:12px;margin:0\">This is an automated message. Please do not reply.</p></td></tr></table></td></tr></table></body></html>' }}",
"options": {}
}
},
{
"id": "respond-error",
"name": "Send Error Response",
"type": "n8n-nodes-base.respondToWebhook",
"typeVersion": 1.1,
"position": [
660,
420
],
"parameters": {
"respondWith": "json",
"responseBody": "={{ JSON.stringify({ success: false, error: $json.error, message: 'Please provide a valid email address' }) }}",
"options": {
"responseCode": 400
}
}
},
{
"id": "wh-verify",
"name": "Receive OTP Verification",
"type": "n8n-nodes-base.webhook",
"typeVersion": 2,
"position": [
0,
700
],
"parameters": {
"httpMethod": "POST",
"path": "verify-otp",
"responseMode": "responseNode",
"options": {}
}
},
{
"id": "extract-submission",
"name": "Extract Submission",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"position": [
220,
700
],
"parameters": {
"jsCode": "const body = $input.first().json.body || $input.first().json;\nreturn [{ json: { submitted_otp: String(body.otp || '').trim(), submitted_email: String(body.email || '').trim().toLowerCase(), session_id: String(body.session_id || '').trim() } }];"
}
},
{
"id": "read-otp",
"name": "Read OTP Record",
"type": "n8n-nodes-base.googleSheets",
"typeVersion": 4.5,
"position": [
440,
700
],
"credentials": {
"googleSheetsOAuth2Api": {
"name": "<your credential>"
}
},
"parameters": {
"operation": "read",
"documentId": {
"__rl": true,
"value": "1NUwfMYpOXuLI8ysTM0_siFxIL-jgNUGjFAD5AH2U-MY",
"mode": "id"
},
"sheetName": {
"__rl": true,
"value": "OTP_Log",
"mode": "name"
},
"filtersUI": {
"values": [
{
"lookupColumn": "Session ID",
"lookupValue": "={{ $json.session_id }}"
}
]
},
"options": {
"returnFirstMatch": true
}
}
},
{
"id": "if-record-found",
"name": "Record Found",
"type": "n8n-nodes-base.if",
"typeVersion": 2,
"position": [
660,
700
],
"parameters": {
"conditions": {
"options": {
"caseSensitive": true,
"leftValue": "",
"typeValidation": "strict"
},
"conditions": [
{
"id": "c3",
"leftValue": "={{ $json['OTP Code'] !== undefined && $json['OTP Code'] !== '' }}",
"rightValue": true,
"operator": {
"type": "boolean",
"operation": "equals"
}
}
],
"combinator": "and"
}
}
},
{
"id": "respond-not-found",
"name": "Session Not Found Response",
"type": "n8n-nodes-base.respondToWebhook",
"typeVersion": 1.1,
"position": [
880,
820
],
"parameters": {
"respondWith": "json",
"responseBody": "={{ JSON.stringify({ success: false, message: 'OTP session not found. Please request a new OTP.', reason: 'SESSION_NOT_FOUND', session_id: $('Extract Submission').item.json.session_id }) }}",
"options": {
"responseCode": 400
}
}
},
{
"id": "code-verify",
"name": "Verify OTP Logic",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"position": [
880,
600
],
"parameters": {
"jsCode": "const submission = $('Extract Submission').first().json;\nconst record = $input.first().json;\nconst submittedOtp = submission.submitted_otp;\nconst submittedEmail = submission.submitted_email;\nconst sessionId = submission.session_id;\nconst storedOtp = String(record['OTP Code'] || '').trim();\nconst storedEmail = String(record['Email'] || '').trim().toLowerCase();\nconst expiryTime = new Date(record['Expiry Time']);\nconst now = new Date();\nconst attempts = parseInt(record['Attempts'] || 0) + 1;\nif (record['Status'] === 'Verified') { return [{ json: { verified: false, reason: 'ALREADY_USED', message: 'This OTP has already been used.', email: submittedEmail, session_id: sessionId, attempts } }]; }\nif (now > expiryTime) { return [{ json: { verified: false, reason: 'EXPIRED', message: 'Your OTP has expired. Please request a new one.', email: submittedEmail, session_id: sessionId, attempts, expired_at: expiryTime.toISOString() } }]; }\nif (attempts > 5) { return [{ json: { verified: false, reason: 'TOO_MANY_ATTEMPTS', message: 'Too many failed attempts. Please request a new OTP.', email: submittedEmail, session_id: sessionId, attempts } }]; }\nif (submittedEmail !== storedEmail) { return [{ json: { verified: false, reason: 'EMAIL_MISMATCH', message: 'Email does not match this OTP session.', email: submittedEmail, session_id: sessionId, attempts } }]; }\nif (submittedOtp !== storedOtp) { return [{ json: { verified: false, reason: 'WRONG_OTP', message: 'Incorrect OTP. Please try again.', email: submittedEmail, session_id: sessionId, attempts, remaining_attempts: Math.max(0, 5 - attempts) } }]; }\nreturn [{ json: { verified: true, reason: 'SUCCESS', message: 'OTP verified successfully.', email: submittedEmail, session_id: sessionId, verified_at: now.toISOString(), attempts, token: 'VERIFIED_' + sessionId + '_' + Date.now() } }];"
}
},
{
"id": "if-verified",
"name": "Is OTP Valid",
"type": "n8n-nodes-base.if",
"typeVersion": 2,
"position": [
1100,
600
],
"parameters": {
"conditions": {
"options": {
"caseSensitive": true,
"leftValue": "",
"typeValidation": "strict"
},
"conditions": [
{
"id": "c2",
"leftValue": "={{ $json.verified }}",
"rightValue": true,
"operator": {
"type": "boolean",
"operation": "equals"
}
}
],
"combinator": "and"
}
}
},
{
"id": "shape-success",
"name": "Shape Success Update",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"position": [
1320,
500
],
"parameters": {
"jsCode": "return [{ json: { 'Session ID': $json.session_id, 'Status': 'Verified', 'Verified At': $json.verified_at || '', 'Attempts': $json.attempts, _verified: true, _message: $json.message, _reason: $json.reason, _session_id: $json.session_id, _token: $json.token, _verified_at: $json.verified_at, _email: $json.email } }];"
}
},
{
"id": "update-success",
"name": "Update OTP Status in Sheets",
"type": "n8n-nodes-base.googleSheets",
"typeVersion": 4.5,
"position": [
1540,
500
],
"credentials": {
"googleSheetsOAuth2Api": {
"name": "<your credential>"
}
},
"parameters": {
"operation": "update",
"documentId": {
"__rl": true,
"value": "1NUwfMYpOXuLI8ysTM0_siFxIL-jgNUGjFAD5AH2U-MY",
"mode": "id"
},
"sheetName": {
"__rl": true,
"value": "OTP_Log",
"mode": "name"
},
"columns": {
"mappingMode": "autoMapInputData",
"value": {},
"matchingColumns": [
"Session ID"
],
"schema": []
},
"options": {}
}
},
{
"id": "respond-verified",
"name": "Verification Result Response",
"type": "n8n-nodes-base.respondToWebhook",
"typeVersion": 1.1,
"position": [
1760,
500
],
"parameters": {
"respondWith": "json",
"responseBody": "={{ JSON.stringify({ success: true, message: $json._message, reason: $json._reason, session_id: $json._session_id, token: $json._token || null, verified_at: $json._verified_at || null }) }}",
"options": {
"responseCode": 200
}
}
},
{
"id": "send-success-email",
"name": "Send Success Email",
"type": "n8n-nodes-base.gmail",
"typeVersion": 2.1,
"position": [
1980,
500
],
"credentials": {
"gmailOAuth2": {
"name": "<your credential>"
}
},
"parameters": {
"sendTo": "={{ $json._email }}",
"subject": "\u2705 Identity Verified Successfully",
"emailType": "html",
"message": "={{ '<div style=\"font-family:Arial,sans-serif;max-width:560px;margin:0 auto;background:#fff;border-radius:16px;overflow:hidden\"><div style=\"background:linear-gradient(135deg,#4CAF50,#2e7d32);padding:32px;text-align:center\"><div style=\"font-size:48px\">\u2705</div><h1 style=\"color:#fff;margin:0;font-size:24px\">Verified Successfully!</h1></div><div style=\"padding:32px\"><p style=\"color:#333;font-size:16px\">Your identity has been verified successfully.</p><div style=\"background:#e8f5e9;border-radius:8px;padding:16px;margin:16px 0\"><p style=\"margin:0;color:#2e7d32;font-size:14px\">\u2705 Email: ' + $json._email + '</p><p style=\"margin:8px 0 0;color:#2e7d32;font-size:14px\">\u2705 Verified at: ' + new Date($json._verified_at).toLocaleString() + '</p></div></div></div>' }}",
"options": {}
}
},
{
"id": "shape-fail",
"name": "Shape Fail Update",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"position": [
1320,
720
],
"parameters": {
"jsCode": "return [{ json: { 'Session ID': $json.session_id, 'Status': $json.reason, 'Attempts': $json.attempts, _message: $json.message, _reason: $json.reason, _session_id: $json.session_id, _remaining: $json.remaining_attempts, _email: $json.email } }];"
}
},
{
"id": "update-fail",
"name": "Update OTP Fail Status",
"type": "n8n-nodes-base.googleSheets",
"typeVersion": 4.5,
"position": [
1540,
720
],
"credentials": {
"googleSheetsOAuth2Api": {
"name": "<your credential>"
}
},
"parameters": {
"operation": "update",
"documentId": {
"__rl": true,
"value": "1NUwfMYpOXuLI8ysTM0_siFxIL-jgNUGjFAD5AH2U-MY",
"mode": "id"
},
"sheetName": {
"__rl": true,
"value": "OTP_Log",
"mode": "name"
},
"columns": {
"mappingMode": "autoMapInputData",
"value": {},
"matchingColumns": [
"Session ID"
],
"schema": []
},
"options": {}
}
},
{
"id": "respond-fail",
"name": "Verification Fail Response",
"type": "n8n-nodes-base.respondToWebhook",
"typeVersion": 1.1,
"position": [
1760,
720
],
"parameters": {
"respondWith": "json",
"responseBody": "={{ JSON.stringify({ success: false, message: $json._message, reason: $json._reason, session_id: $json._session_id, remaining_attempts: $json._remaining || null }) }}",
"options": {
"responseCode": 400
}
}
},
{
"id": "send-fail-email",
"name": "Send Failure Email",
"type": "n8n-nodes-base.gmail",
"typeVersion": 2.1,
"position": [
1980,
720
],
"credentials": {
"gmailOAuth2": {
"name": "<your credential>"
}
},
"parameters": {
"sendTo": "={{ $json._email }}",
"subject": "={{ '\u274c OTP Verification Failed \u2014 ' + $json._reason }}",
"emailType": "html",
"message": "={{ '<div style=\"font-family:Arial,sans-serif;max-width:560px;margin:0 auto;background:#fff;border-radius:16px;overflow:hidden\"><div style=\"background:linear-gradient(135deg,#f44336,#b71c1c);padding:32px;text-align:center\"><div style=\"font-size:48px\">\u274c</div><h1 style=\"color:#fff;margin:8px 0 0;font-size:22px\">Verification Failed</h1></div><div style=\"padding:32px\"><p style=\"color:#333;font-size:16px\">' + $json._message + '</p>' + ($json._remaining > 0 ? '<p style=\"color:#ff9800;font-size:14px\">\u26a0\ufe0f Attempts remaining: ' + $json._remaining + '</p>' : '<p style=\"color:#f44336;font-size:14px\">\ud83d\udd12 Please request a new OTP.</p>') + '<p style=\"color:#999;font-size:13px\">Reason code: ' + $json._reason + '</p></div></div>' }}",
"options": {}
}
}
],
"connections": {
"Receive OTP Request": {
"main": [
[
{
"node": "Validate and Generate OTP",
"type": "main",
"index": 0
}
]
]
},
"Validate and Generate OTP": {
"main": [
[
{
"node": "Is Email Valid",
"type": "main",
"index": 0
}
]
]
},
"Is Email Valid": {
"main": [
[
{
"node": "Shape OTP Log Data",
"type": "main",
"index": 0
}
],
[
{
"node": "Send Error Response",
"type": "main",
"index": 0
}
]
]
},
"Shape OTP Log Data": {
"main": [
[
{
"node": "Log OTP to Sheets",
"type": "main",
"index": 0
}
]
]
},
"Log OTP to Sheets": {
"main": [
[
{
"node": "Send OTP Success Response",
"type": "main",
"index": 0
}
]
]
},
"Send OTP Success Response": {
"main": [
[
{
"node": "Send OTP Email",
"type": "main",
"index": 0
}
]
]
},
"Receive OTP Verification": {
"main": [
[
{
"node": "Extract Submission",
"type": "main",
"index": 0
}
]
]
},
"Extract Submission": {
"main": [
[
{
"node": "Read OTP Record",
"type": "main",
"index": 0
}
]
]
},
"Read OTP Record": {
"main": [
[
{
"node": "Record Found",
"type": "main",
"index": 0
}
]
]
},
"Record Found": {
"main": [
[
{
"node": "Verify OTP Logic",
"type": "main",
"index": 0
}
],
[
{
"node": "Session Not Found Response",
"type": "main",
"index": 0
}
]
]
},
"Verify OTP Logic": {
"main": [
[
{
"node": "Is OTP Valid",
"type": "main",
"index": 0
}
]
]
},
"Is OTP Valid": {
"main": [
[
{
"node": "Shape Success Update",
"type": "main",
"index": 0
}
],
[
{
"node": "Shape Fail Update",
"type": "main",
"index": 0
}
]
]
},
"Shape Success Update": {
"main": [
[
{
"node": "Update OTP Status in Sheets",
"type": "main",
"index": 0
}
]
]
},
"Update OTP Status in Sheets": {
"main": [
[
{
"node": "Verification Result Response",
"type": "main",
"index": 0
}
]
]
},
"Verification Result Response": {
"main": [
[
{
"node": "Send Success Email",
"type": "main",
"index": 0
}
]
]
},
"Shape Fail Update": {
"main": [
[
{
"node": "Update OTP Fail Status",
"type": "main",
"index": 0
}
]
]
},
"Update OTP Fail Status": {
"main": [
[
{
"node": "Verification Fail Response",
"type": "main",
"index": 0
}
]
]
},
"Verification Fail Response": {
"main": [
[
{
"node": "Send Failure Email",
"type": "main",
"index": 0
}
]
]
}
},
"settings": {
"executionOrder": "v1",
"saveManualExecutions": true,
"callerPolicy": "workflowsFromSameOwner",
"availableInMCP": false
},
"staticData": null,
"meta": null,
"versionId": "388006b6-f459-4683-b4dc-f9a0b79bc4c8",
"activeVersionId": "388006b6-f459-4683-b4dc-f9a0b79bc4c8",
"versionCounter": 16,
"triggerCount": 2,
"tags": [],
"shared": [
{
"updatedAt": "2026-03-30T13:14:26.968Z",
"createdAt": "2026-03-30T13:14:26.968Z",
"role": "workflow:owner",
"workflowId": "HDlrxGe1GI2uGKBV",
"projectId": "KaaB9eLEU6T6FdOr",
"project": {
"updatedAt": "2026-03-29T11:22:07.297Z",
"createdAt": "2026-03-15T10:25:50.376Z",
"id": "KaaB9eLEU6T6FdOr",
"name": "Admin User <admin@n8n.local>",
"type": "personal",
"icon": null,
"description": null,
"creatorId": "28a0614f-963b-453e-b373-b2cbab3d7b07"
}
}
]
}
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.
gmailOAuth2googleSheetsOAuth2Api
Pro
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About this workflow
OTP Verification System. Uses googleSheets, gmail. Webhook trigger; 23 nodes.
Source: https://github.com/Kavix28/Kapoor-Associates/blob/0862f11e9db134ae2511bb3f59b4dbf0417dfe81/n8n-workflows/otp-workflow.json — original creator credit. Request a take-down →
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