Alok Kumar 
This workflow corresponds to n8n.io template #8174 — we link there as the canonical source.
This workflow follows the Form → Form Trigger 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 →
{
"id": "5myl9GWWVupDIebk",
"meta": {
"templateCredsSetupCompleted": true
},
"name": "Multi-Level Document Approval & Audit Workflow",
"tags": [],
"nodes": [
{
"id": "9e61af97-d649-4260-becd-ea8865bad9ff",
"name": "Webhook",
"type": "n8n-nodes-base.webhook",
"position": [
-560,
1104
],
"parameters": {
"path": "approve",
"options": {},
"responseMode": "responseNode"
},
"typeVersion": 2.1
},
{
"id": "cb8cc119-29a2-48e7-84bf-81f79d57c27e",
"name": "Audit1",
"type": "n8n-nodes-base.supabase",
"position": [
-256,
2032
],
"parameters": {
"tableId": "audit_logs",
"fieldsUi": {
"fieldValues": [
{
"fieldId": "document_id",
"fieldValue": "={{ $('get_approval_data').item.json.document_id }}"
},
{
"fieldId": "action",
"fieldValue": "approval_sent"
},
{
"fieldId": "actor_email",
"fieldValue": "system@workflow"
},
{
"fieldId": "details",
"fieldValue": "=Level {{ $('get_next_level').item.json.level_number }} requests sent to role_id {{ $('generate_uuid').item.json.role_id}} "
}
]
}
},
"credentials": {
"supabaseApi": {
"name": "<your credential>"
}
},
"typeVersion": 1
},
{
"id": "7dd27017-db27-40d2-ae81-1f5e8bd296b5",
"name": "Final Update Document",
"type": "n8n-nodes-base.supabase",
"position": [
80,
1808
],
"parameters": {
"filters": {
"conditions": [
{
"keyName": "id",
"keyValue": "={{ $('get_approval_data').item.json.document_id }}",
"condition": "eq"
}
]
},
"tableId": "documents",
"fieldsUi": {
"fieldValues": [
{
"fieldId": "status",
"fieldValue": "={{ $json.status }}"
},
{
"fieldId": "updated_at",
"fieldValue": "={{ new Date(Date.now()).toISOString() }}"
}
]
},
"operation": "update"
},
"credentials": {
"supabaseApi": {
"name": "<your credential>"
}
},
"typeVersion": 1
},
{
"id": "564ca96f-4b65-4f0b-b075-1a02eed98893",
"name": "save_document",
"type": "n8n-nodes-base.supabase",
"position": [
816,
0
],
"parameters": {
"tableId": "documents",
"fieldsUi": {
"fieldValues": [
{
"fieldId": "title",
"fieldValue": "={{ $('start_approval_form').item.json.Title }}"
},
{
"fieldId": "content",
"fieldValue": "={{ $('start_approval_form').item.json.data[0].filename }}"
},
{
"fieldId": "submitted_by",
"fieldValue": "1"
},
{
"fieldId": "status",
"fieldValue": "Pending"
}
]
}
},
"credentials": {
"supabaseApi": {
"name": "<your credential>"
}
},
"typeVersion": 1
},
{
"id": "98fbb076-c588-4e88-8a62-b91c6adab3c2",
"name": "get_workflow_level_one",
"type": "n8n-nodes-base.supabase",
"position": [
1184,
0
],
"parameters": {
"filters": {
"conditions": [
{
"keyName": "level_number",
"keyValue": "1"
}
]
},
"tableId": "workflow_levels",
"operation": "get"
},
"credentials": {
"supabaseApi": {
"name": "<your credential>"
}
},
"typeVersion": 1
},
{
"id": "550fde74-26c2-4a04-bfcb-cc801f2bdf50",
"name": "get_user_by_role",
"type": "n8n-nodes-base.supabase",
"position": [
448,
224
],
"parameters": {
"filters": {
"conditions": [
{
"keyName": "role_id",
"keyValue": "={{ $json.role_id }}",
"condition": "eq"
}
]
},
"tableId": "users",
"operation": "getAll",
"returnAll": true
},
"credentials": {
"supabaseApi": {
"name": "<your credential>"
}
},
"typeVersion": 1
},
{
"id": "d45ef572-ca77-4e3b-b040-933d14d54763",
"name": "create_uuid_token",
"type": "n8n-nodes-base.crypto",
"position": [
816,
224
],
"parameters": {
"action": "generate"
},
"typeVersion": 1
},
{
"id": "5b325046-052d-4f11-960c-f97a6ac79703",
"name": "create_record_approvals",
"type": "n8n-nodes-base.supabase",
"position": [
1184,
224
],
"parameters": {
"tableId": "approvals",
"fieldsUi": {
"fieldValues": [
{
"fieldId": "document_id",
"fieldValue": "={{ $('save_document').item.json.id }}"
},
{
"fieldId": "level_id",
"fieldValue": "={{ $('get_workflow_level_one').item.json.id }}"
},
{
"fieldId": "approver_id",
"fieldValue": "={{ $json.id }}"
},
{
"fieldId": "token",
"fieldValue": "={{ $json.data }}"
},
{
"fieldId": "status",
"fieldValue": "={{ $('save_document').item.json.status }}"
},
{
"fieldId": "expiry_time",
"fieldValue": "={{ new Date(Date.now() + 48 * 60 * 60 * 1000) }}"
}
]
}
},
"credentials": {
"supabaseApi": {
"name": "<your credential>"
}
},
"typeVersion": 1
},
{
"id": "cd4dc454-6893-44d7-89d5-b4703e1787d7",
"name": "send_email",
"type": "n8n-nodes-base.gmail",
"position": [
816,
464
],
"parameters": {
"sendTo": "={{ $('create_uuid_token').item.json.email }}",
"message": "=<p>Please review: {{ $('save_document').item.json.title }}</p>\n<p>\n <a href=\"http://localhost:5678/webhook-test/doc-approval/approve?token={{$json.token}}&decision=approved\">Approve</a> |\n <a href=\"http://localhost:5678/webhook-test/doc-approvalapprove?token={{$json.token}}&decision=rejected\">Reject</a>\n</p>",
"options": {
"attachmentsUi": {
"attachmentsBinary": [
{}
]
}
},
"subject": "=Document Approval Request - {{ $('save_document').item.json.title }}"
},
"credentials": {
"gmailOAuth2": {
"name": "<your credential>"
}
},
"typeVersion": 2.1
},
{
"id": "879f0811-789f-426e-8a09-caf7c326b3fc",
"name": "audit_invites",
"type": "n8n-nodes-base.supabase",
"position": [
1200,
464
],
"parameters": {
"tableId": "audit_logs",
"fieldsUi": {
"fieldValues": [
{
"fieldId": "document_id",
"fieldValue": "={{ $('save_document').item.json.id }}"
},
{
"fieldId": "action",
"fieldValue": "approval_sent"
},
{
"fieldId": "actor_email",
"fieldValue": "system@workflow"
},
{
"fieldId": "details",
"fieldValue": "=Level 1 requests sent to role_id {{ $('get_workflow_level_one').item.json.role_id}} "
}
]
}
},
"credentials": {
"supabaseApi": {
"name": "<your credential>"
}
},
"typeVersion": 1
},
{
"id": "4c3db623-dc84-47cd-81c3-2d1553f0218b",
"name": "start_approval_form",
"type": "n8n-nodes-base.formTrigger",
"position": [
128,
0
],
"parameters": {
"options": {
"path": "approval-process-start",
"ignoreBots": true,
"buttonLabel": "Send for Approval",
"appendAttribution": true,
"useWorkflowTimezone": true
},
"formTitle": "Document Approval",
"formFields": {
"values": [
{
"fieldLabel": "Title",
"placeholder": "Give some Title of document ",
"requiredField": true
},
{
"fieldType": "textarea",
"fieldLabel": "Description",
"placeholder": "Describe what document all about. "
},
{
"fieldType": "file",
"fieldLabel": "data",
"requiredField": true,
"acceptFileTypes": ".pdf"
}
]
},
"formDescription": "Document Approval Workflow "
},
"typeVersion": 2.2,
"alwaysOutputData": false
},
{
"id": "3523cf77-050b-46f7-b06e-975ae91c606f",
"name": "get_approval_data",
"type": "n8n-nodes-base.supabase",
"position": [
-272,
1104
],
"parameters": {
"filters": {
"conditions": [
{
"keyName": "token",
"keyValue": "={{ $json.query.token }}"
}
]
},
"tableId": "approvals",
"operation": "get"
},
"credentials": {
"supabaseApi": {
"name": "<your credential>"
}
},
"typeVersion": 1,
"alwaysOutputData": true
},
{
"id": "0047e141-6fe8-40b3-b998-874e2c3fa018",
"name": "update_approval_data",
"type": "n8n-nodes-base.supabase",
"position": [
416,
1088
],
"parameters": {
"filters": {
"conditions": [
{
"keyName": "approver_id",
"keyValue": "={{ $json.approver_id }}",
"condition": "eq"
},
{
"keyName": "status",
"keyValue": "Pending",
"condition": "eq"
},
{
"keyName": "token",
"keyValue": "={{ $json.token }}",
"condition": "eq"
}
]
},
"tableId": "approvals",
"fieldsUi": {
"fieldValues": [
{
"fieldId": "status",
"fieldValue": "={{ $('Webhook').item.json.query.decision }}"
},
{
"fieldId": "acted_at",
"fieldValue": "={{ new Date(Date.now()).toISOString() }}"
}
]
},
"matchType": "allFilters",
"operation": "update"
},
"credentials": {
"supabaseApi": {
"name": "<your credential>"
}
},
"typeVersion": 1
},
{
"id": "4f6b45fc-e8de-469d-a936-de70f9c890c0",
"name": "check_reject_or_approve",
"type": "n8n-nodes-base.if",
"position": [
800,
1088
],
"parameters": {
"options": {},
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "6222263f-cd22-457d-8446-b19f7e1b6ffb",
"operator": {
"name": "filter.operator.equals",
"type": "string",
"operation": "equals"
},
"leftValue": "={{ $('Webhook').item.json.query.decision }}",
"rightValue": "approved"
}
]
}
},
"typeVersion": 2.2
},
{
"id": "6afc3654-1ac1-43a0-a800-2d60a676f336",
"name": "get_level_details",
"type": "n8n-nodes-base.supabase",
"position": [
1168,
1072
],
"parameters": {
"filters": {
"conditions": [
{
"keyName": "id",
"keyValue": "={{ $('get_approval_data').item.json.level_id }}"
}
]
},
"tableId": "workflow_levels",
"operation": "get"
},
"credentials": {
"supabaseApi": {
"name": "<your credential>"
}
},
"typeVersion": 1
},
{
"id": "e8913824-5efa-46f2-b95d-d065491b63b1",
"name": "get_next_level",
"type": "n8n-nodes-base.supabase",
"position": [
1520,
1072
],
"parameters": {
"limit": 1,
"filters": {
"conditions": [
{
"keyName": "level_number",
"keyValue": "={{ $json.level_number }}",
"condition": "gt"
}
]
},
"tableId": "workflow_levels",
"operation": "getAll"
},
"credentials": {
"supabaseApi": {
"name": "<your credential>"
}
},
"typeVersion": 1,
"alwaysOutputData": true
},
{
"id": "ced013ad-e2c4-42b0-9a4a-63198d442a21",
"name": "is_last_level",
"type": "n8n-nodes-base.if",
"position": [
-544,
1456
],
"parameters": {
"options": {},
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "fb67a0fe-ced5-47a8-8f08-805d4253d0cf",
"operator": {
"type": "object",
"operation": "notEmpty",
"singleValue": true
},
"leftValue": "={{ $('get_next_level').item.json }}",
"rightValue": "={{ {} }}"
}
]
}
},
"typeVersion": 2.2
},
{
"id": "8ab1e933-546e-4f31-8e4b-f40e6fd24ccc",
"name": "get_workflow_by_level",
"type": "n8n-nodes-base.supabase",
"position": [
-272,
1440
],
"parameters": {
"filters": {
"conditions": [
{
"keyName": "level_number",
"keyValue": "= {{ $json.level_number }}"
}
]
},
"tableId": "workflow_levels",
"operation": "get"
},
"credentials": {
"supabaseApi": {
"name": "<your credential>"
}
},
"typeVersion": 1
},
{
"id": "68732d0b-c579-45dd-90b5-022bacccd8c3",
"name": "get_user_by_role1",
"type": "n8n-nodes-base.supabase",
"position": [
80,
1440
],
"parameters": {
"filters": {
"conditions": [
{
"keyName": "role_id",
"keyValue": "={{ $json.role_id }}",
"condition": "eq"
}
]
},
"tableId": "users",
"operation": "getAll",
"returnAll": true
},
"credentials": {
"supabaseApi": {
"name": "<your credential>"
}
},
"typeVersion": 1
},
{
"id": "4075c718-7f9d-41ef-a8d9-aad892838493",
"name": "generate_uuid",
"type": "n8n-nodes-base.crypto",
"position": [
416,
1440
],
"parameters": {
"action": "generate"
},
"typeVersion": 1
},
{
"id": "4c8bac58-805f-4a43-92a0-ebfde03c5092",
"name": "create_approval_record",
"type": "n8n-nodes-base.supabase",
"position": [
800,
1456
],
"parameters": {
"tableId": "approvals",
"fieldsUi": {
"fieldValues": [
{
"fieldId": "document_id",
"fieldValue": "={{ $('get_approval_data').item.json.document_id }}"
},
{
"fieldId": "level_id",
"fieldValue": "={{ $('get_next_level').item.json.id }}"
},
{
"fieldId": "approver_id",
"fieldValue": "={{ $json.id }}"
},
{
"fieldId": "token",
"fieldValue": "={{ $json.data }}"
},
{
"fieldId": "status",
"fieldValue": "=Pending"
},
{
"fieldId": "expiry_time",
"fieldValue": "={{ new Date(Date.now() + 48 * 60 * 60 * 1000) }}"
}
]
}
},
"credentials": {
"supabaseApi": {
"name": "<your credential>"
}
},
"typeVersion": 1
},
{
"id": "ebd1975c-a8c6-4703-89a0-9eb062aae079",
"name": "send_emai_by_level",
"type": "n8n-nodes-base.gmail",
"position": [
-560,
2032
],
"parameters": {
"sendTo": "={{ $('generate_uuid').item.json.email }}",
"message": "=<p>Please review:</p>\n<p>\n <a href=\"http://localhost:5678/webhook-test/approve?token={{ $('generate_uuid').item.json.data }}&decision=approved\">Approve</a> |\n <a href=\"http://localhost:5678/webhook-test/approve?token={{ $('generate_uuid').item.json.data }}&decision=rejected\">Reject</a>\n</p>",
"options": {
"attachmentsUi": {
"attachmentsBinary": [
{}
]
}
},
"subject": "=Document Approval Request - {{ $('get_document_details').item.json.title }}"
},
"credentials": {
"gmailOAuth2": {
"name": "<your credential>"
}
},
"typeVersion": 2.1
},
{
"id": "40dcfb0b-0c3f-4469-a3ba-c85793c1da1b",
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"position": [
-1312,
-240
],
"parameters": {
"width": 608,
"height": 2528,
"content": "## Multi-Level Document Approval & Audit Workflow\n\nThis workflow automates a **document approval process** using Supabase and Gmail. \n\n---\n\n### Who it\u2019s for\n- Teams that need structured multi-level document approvals. \n- Companies managing policies, contracts, or proposals. \n- Anyone using **Supabase** as a backend with approval/audit requirements. \n\n---\n\n### How it works\n1. **Form Trigger** \u2013 A user submits a document via the form. \n2. **Supabase Integration** \u2013 The document is saved in the `documents` table. \n3. **Workflow Levels** \u2013 Fetches the correct approval level from `workflow_levels`. \n4. **Assign Approvers** \u2013 Matches approvers by role from the `users` table. \n5. **Approval Record** \u2013 Creates an `approvals` record with a unique token and expiry. \n6. **Email Notification** \u2013 Sends an email with **Approve / Reject links**. \n7. **Audit Logs** \u2013 Records every approval request in `audit_logs`. \n\n---\n\n### How to set up\n- Configure your **Supabase credentials**. \n- Update table IDs (`documents`, `workflow_levels`, `users`, `approvals`, `audit_logs`) to match your schema. \n- Connect your **Gmail account**. \n- Adjust approval expiry time (`48h` default). \n- Deploy and test via the **Form Trigger**. \n\n---\n\n### Requirements\n- A Supabase project with the listed tables. \n- A Gmail account connected to n8n. \n\n---\n\n### Customization\n- Add multiple approval levels by chaining `workflow_levels`. \n- Replace Gmail with Slack, Teams, or another notification channel. \n- Adjust audit logging for compliance needs. \n- Update the endpoint - http://localhost:5678/webhook-test/ based on instance and env (remove test if you run in prod)\n- Handle error in each step pf db interaction.\n\n---\n\n### 1. **Webhook Entry Point**\n- Triggered when an approver clicks the **Approve** or **Reject** link in email. \n- Captures query parameters: \n - `token` (approval token) \n - `decision` (approved/rejected) \n\n---\n\n### 2. **Approval Data Retrieval & Update**\n- Fetch approval record from **Supabase (approvals)** using `token`. \n- Update approval status: \n - `Approved` \u2192 moves to next workflow level or final approval. \n - `Rejected` \u2192 document marked as rejected immediately. \n- Records `acted_at` timestamp. \n\n---\n\n### 3. **Decision Check**\n- **IF Node** checks whether the decision is **approved** or **rejected**. \n- **Reject Path** \u2192 Update document status to **Rejected** in `documents`. \n- **Approve Path** \u2192 Continue workflow level progression. \n\n---\n\n### 4. **Workflow Level Progression**\n- Fetch details of the current workflow level. \n- Identify the **next level** (`workflow_levels`) based on `level_number`. \n\n#### \u2705 If Next Level Exists:\n- Retrieve approvers by `role_id`. \n- Generate unique approval tokens. \n- Create new approval records in `approvals`. \n- Send **email notifications** with approval/reject links. \n\n#### \u274c If No Next Level (Last Level):\n- Update document status to **Approved** in `documents`. \n\n---\n\n### 5. **Audit Logging**\n- Every approval action is logged into `audit_logs` table: \n - `document_id` \n - `action` (e.g., `approval_sent`, `approved`, `rejected`) \n - `actor_email` (system/approver) \n - `details` (workflow level, role info, etc.) \n\n---\n\n## \ud83d\udce8 Email Template\nApproval request email includes **decision links**: \n\n```html\n<p>Please review the document:</p>\n<p>\n <a href=\"http://localhost:5678/webhook-test/doc-approval?token={{$json.token}}&decision=approved\">\u2705 Approve</a> |\n <a href=\"http://localhost:5678/webhook-test/doc-approval?token={{$json.token}}&decision=rejected\">\u274c Reject</a>\n</p>'''\n"
},
"typeVersion": 1
},
{
"id": "7db49d0e-c7c5-4423-af60-17e63aa9fea1",
"name": "Sticky Note1",
"type": "n8n-nodes-base.stickyNote",
"position": [
-656,
-224
],
"parameters": {
"width": 720,
"height": 1120,
"content": "## Database Schema\n\n```sql\n-- 1. ROLES: Define roles like Manager, Finance, HR\nCREATE TABLE roles (\n id SERIAL PRIMARY KEY,\n name VARCHAR(100) NOT NULL UNIQUE,\n description TEXT\n);\n\n-- 2. USERS: All approvers (internal + external flag)\nCREATE TABLE users (\n id SERIAL PRIMARY KEY,\n name VARCHAR(150) NOT NULL,\n email VARCHAR(200) NOT NULL UNIQUE,\n role_id INT REFERENCES roles(id) ON DELETE SET NULL,\n is_external BOOLEAN DEFAULT FALSE,\n created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP\n);\n\n-- 3. DOCUMENTS: The items that need approval\nCREATE TABLE documents (\n id SERIAL PRIMARY KEY,\n title VARCHAR(255) NOT NULL,\n content TEXT, -- could also just store metadata, file path, or S3 link\n submitted_by INT REFERENCES users(id) ON DELETE SET NULL,\n status VARCHAR(50) DEFAULT 'Pending', -- Pending / Approved / Rejected\n created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,\n updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP\n);\n\n-- 4. WORKFLOW LEVELS: Configure levels & roles\nCREATE TABLE workflow_levels (\n id SERIAL PRIMARY KEY,\n level_number INT NOT NULL,\n role_id INT REFERENCES roles(id) ON DELETE CASCADE,\n approval_type VARCHAR(20) DEFAULT 'any', -- any / all\n description TEXT\n);\n\n-- 5. APPROVALS: Tracks individual approval actions\nCREATE TABLE approvals (\n id SERIAL PRIMARY KEY,\n document_id INT REFERENCES documents(id) ON DELETE CASCADE,\n level_id INT REFERENCES workflow_levels(id) ON DELETE CASCADE,\n approver_id INT REFERENCES users(id) ON DELETE CASCADE,\n token VARCHAR(255) NOT NULL UNIQUE, -- one-time token for secure link\n status VARCHAR(20) DEFAULT 'Pending', -- Pending / Approved / Rejected\n expiry_time TIMESTAMP,\n acted_at TIMESTAMP\n);\n\n-- 6. AUDIT LOGS (optional, for tracking history)\nCREATE TABLE audit_logs (\n id SERIAL PRIMARY KEY,\n document_id INT REFERENCES documents(id) ON DELETE CASCADE,\n action VARCHAR(50), -- submitted / approved / rejected / escalated\n actor_email VARCHAR(200),\n details TEXT,\n created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP\n);\n```"
},
"typeVersion": 1
},
{
"id": "25ef7fca-6462-4806-bf01-d0c552aabae7",
"name": "Audit",
"type": "n8n-nodes-base.supabase",
"position": [
416,
1792
],
"parameters": {
"tableId": "audit_logs",
"fieldsUi": {
"fieldValues": [
{
"fieldId": "document_id",
"fieldValue": "={{ $('get_approval_data').item.json.document_id }}"
},
{
"fieldId": "action",
"fieldValue": "approval_sent"
},
{
"fieldId": "actor_email",
"fieldValue": "system@workflow"
},
{
"fieldId": "details",
"fieldValue": "=Level {{ $('get_next_level').item.json.level_number }} requests sent to role_id {{ $('generate_uuid').item.json.role_id}} "
}
]
}
},
"credentials": {
"supabaseApi": {
"name": "<your credential>"
}
},
"typeVersion": 1
},
{
"id": "48036695-12b4-479a-a547-eb45eb9da598",
"name": "Respond to Webhook1",
"type": "n8n-nodes-base.respondToWebhook",
"position": [
1552,
2016
],
"parameters": {
"options": {},
"respondWith": "text",
"responseBody": "=Workflow Competed - {{ $json.Response }}"
},
"typeVersion": 1.4
},
{
"id": "d2c8dca0-c040-4035-bbd2-5812e571e0b9",
"name": "upload_to_supabase_storage",
"type": "n8n-nodes-base.httpRequest",
"position": [
464,
0
],
"parameters": {
"url": "=https://<your_project_id>.supabase.co/storage/v1/object/test-n8n/{{ $binary.data.fileName }}",
"method": "POST",
"options": {},
"sendBody": true,
"contentType": "binaryData",
"authentication": "predefinedCredentialType",
"inputDataFieldName": "data",
"nodeCredentialType": "supabaseApi"
},
"credentials": {
"supabaseApi": {
"name": "<your credential>"
}
},
"typeVersion": 4.2
},
{
"id": "86e2bbb7-44b6-43f7-bf31-28453caf3369",
"name": "fetch_file_to_review",
"type": "n8n-nodes-base.httpRequest",
"position": [
432,
464
],
"parameters": {
"url": "=https://uptttiuxuaacxrdofqgm.supabase.co/storage/v1/object/{{ $('upload_to_supabase_storage').item.json.Key }}",
"options": {},
"authentication": "predefinedCredentialType",
"nodeCredentialType": "supabaseApi"
},
"credentials": {
"supabaseApi": {
"name": "<your credential>"
}
},
"typeVersion": 4.2
},
{
"id": "c82dba30-479d-4045-af9d-635f1aea605b",
"name": "get_document_details",
"type": "n8n-nodes-base.supabase",
"position": [
1168,
1456
],
"parameters": {
"filters": {
"conditions": [
{
"keyName": "id",
"keyValue": "={{ $json.document_id }}"
}
]
},
"tableId": "documents",
"operation": "get"
},
"credentials": {
"supabaseApi": {
"name": "<your credential>"
}
},
"typeVersion": 1
},
{
"id": "13d7e82a-f7b3-4cbd-b51f-bcc1e57a1602",
"name": "fetch_file_to_review1",
"type": "n8n-nodes-base.httpRequest",
"position": [
1536,
1456
],
"parameters": {
"url": "=https://<your_project_id>.supabase.co/storage/v1/object/test-n8n/{{ $json.content }}",
"options": {},
"authentication": "predefinedCredentialType",
"nodeCredentialType": "supabaseApi"
},
"credentials": {
"supabaseApi": {
"name": "<your credential>"
}
},
"typeVersion": 4.2
},
{
"id": "db503b96-a362-4b14-a41b-aa87bf156392",
"name": "If",
"type": "n8n-nodes-base.if",
"position": [
80,
1104
],
"parameters": {
"options": {},
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "eff8437b-ef76-4bef-a6c2-9d65083ab8c5",
"operator": {
"type": "object",
"operation": "empty",
"singleValue": true
},
"leftValue": "={{ $json }}",
"rightValue": ""
}
]
}
},
"typeVersion": 2.2
},
{
"id": "694b4cde-a457-4496-816f-02ba86b4eb9e",
"name": "response_message",
"type": "n8n-nodes-base.set",
"position": [
800,
1296
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "d6c443be-ca83-4708-b80b-9a5eefd11d60",
"name": "Response",
"type": "string",
"value": "Not a value token"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "30cd5073-3d59-48ae-a572-57157ee5e6cb",
"name": "response_message1",
"type": "n8n-nodes-base.set",
"position": [
800,
1792
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "d6c443be-ca83-4708-b80b-9a5eefd11d60",
"name": "Response",
"type": "string",
"value": "Rejected"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "17e8d16b-8c04-45de-90a0-1d8fc1711cd5",
"name": "response_message2",
"type": "n8n-nodes-base.set",
"position": [
128,
2032
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "d6c443be-ca83-4708-b80b-9a5eefd11d60",
"name": "Response",
"type": "string",
"value": "Approved"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "bb9fb0aa-d3a2-434b-a34a-047562654983",
"name": "Sticky Note2",
"type": "n8n-nodes-base.stickyNote",
"position": [
352,
-128
],
"parameters": {
"width": 336,
"height": 288,
"content": "### Update url for supabase storage "
},
"typeVersion": 1
},
{
"id": "d902be56-14a6-4071-ae13-7b0dddf4284a",
"name": "end_form",
"type": "n8n-nodes-base.form",
"position": [
1472,
464
],
"parameters": {
"options": {},
"operation": "completion",
"completionTitle": "Approval Workflow Started."
},
"typeVersion": 1
},
{
"id": "edf83e23-536a-4a9d-a5be-f6401690ab2a",
"name": "Sticky Note3",
"type": "n8n-nodes-base.stickyNote",
"position": [
112,
-208
],
"parameters": {
"color": 4,
"width": 1664,
"height": 1120,
"content": "## Form Submit flow"
},
"typeVersion": 1
},
{
"id": "5109e9e9-b938-44be-8154-7dd287030589",
"name": "Sticky Note4",
"type": "n8n-nodes-base.stickyNote",
"position": [
-656,
992
],
"parameters": {
"color": 4,
"width": 2448,
"height": 1264,
"content": "## Next Level Approval"
},
"typeVersion": 1
}
],
"active": false,
"settings": {
"executionOrder": "v1"
},
"versionId": "de5c52a4-7369-4d59-a8c1-b7e4e1aa5636",
"connections": {
"If": {
"main": [
[
{
"node": "update_approval_data",
"type": "main",
"index": 0
}
],
[
{
"node": "response_message",
"type": "main",
"index": 0
}
]
]
},
"Audit": {
"main": [
[
{
"node": "response_message1",
"type": "main",
"index": 0
}
]
]
},
"Audit1": {
"main": [
[
{
"node": "response_message2",
"type": "main",
"index": 0
}
]
]
},
"Webhook": {
"main": [
[
{
"node": "get_approval_data",
"type": "main",
"index": 0
}
]
]
},
"send_email": {
"main": [
[
{
"node": "audit_invites",
"type": "main",
"index": 0
}
]
]
},
"audit_invites": {
"main": [
[
{
"node": "end_form",
"type": "main",
"index": 0
}
]
]
},
"generate_uuid": {
"main": [
[
{
"node": "create_approval_record",
"type": "main",
"index": 0
}
]
]
},
"is_last_level": {
"main": [
[
{
"node": "get_workflow_by_level",
"type": "main",
"index": 0
}
],
[
{
"node": "Final Update Document",
"type": "main",
"index": 0
}
]
]
},
"save_document": {
"main": [
[
{
"node": "get_workflow_level_one",
"type": "main",
"index": 0
}
]
]
},
"get_next_level": {
"main": [
[
{
"node": "is_last_level",
"type": "main",
"index": 0
}
]
]
},
"get_user_by_role": {
"main": [
[
{
"node": "create_uuid_token",
"type": "main",
"index": 0
}
]
]
},
"response_message": {
"main": [
[
{
"node": "Respond to Webhook1",
"type": "main",
"index": 0
}
]
]
},
"create_uuid_token": {
"main": [
[
{
"node": "create_record_approvals",
"type": "main",
"index": 0
}
]
]
},
"get_approval_data": {
"main": [
[
{
"node": "If",
"type": "main",
"index": 0
}
]
]
},
"get_level_details": {
"main": [
[
{
"node": "get_next_level",
"type": "main",
"index": 0
}
]
]
},
"get_user_by_role1": {
"main": [
[
{
"node": "generate_uuid",
"type": "main",
"index": 0
}
]
]
},
"response_message1": {
"main": [
[
{
"node": "Respond to Webhook1",
"type": "main",
"index": 0
}
]
]
},
"response_message2": {
"main": [
[
{
"node": "Respond to Webhook1",
"type": "main",
"index": 0
}
]
]
},
"send_emai_by_level": {
"main": [
[
{
"node": "Audit1",
"type": "main",
"index": 0
}
]
]
},
"start_approval_form": {
"main": [
[
{
"node": "upload_to_supabase_storage",
"type": "main",
"index": 0
}
]
]
},
"fetch_file_to_review": {
"main": [
[
{
"node": "send_email",
"type": "main",
"index": 0
}
]
]
},
"get_document_details": {
"main": [
[
{
"node": "fetch_file_to_review1",
"type": "main",
"index": 0
}
]
]
},
"update_approval_data": {
"main": [
[
{
"node": "check_reject_or_approve",
"type": "main",
"index": 0
}
]
]
},
"Final Update Document": {
"main": [
[
{
"node": "Audit",
"type": "main",
"index": 0
}
]
]
},
"fetch_file_to_review1": {
"main": [
[
{
"node": "send_emai_by_level",
"type": "main",
"index": 0
}
]
]
},
"get_workflow_by_level": {
"main": [
[
{
"node": "get_user_by_role1",
"type": "main",
"index": 0
}
]
]
},
"create_approval_record": {
"main": [
[
{
"node": "get_document_details",
"type": "main",
"index": 0
}
]
]
},
"get_workflow_level_one": {
"main": [
[
{
"node": "get_user_by_role",
"type": "main",
"index": 0
}
]
]
},
"check_reject_or_approve": {
"main": [
[
{
"node": "get_level_details",
"type": "main",
"index": 0
}
],
[
{
"node": "Final Update Document",
"type": "main",
"index": 0
}
]
]
},
"create_record_approvals": {
"main": [
[
{
"node": "fetch_file_to_review",
"type": "main",
"index": 0
}
]
]
},
"upload_to_supabase_storage": {
"main": [
[
{
"node": "save_document",
"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.
gmailOAuth2supabaseApi
Pro
For the full experience including quality scoring and batch install features for each workflow upgrade to Pro
About this workflow
This workflow automates a document approval process using Supabase and Gmail. Teams that need structured multi-level document approvals. Companies managing policies, contracts, or proposals. Medical document need multiple lavel of review and approval. Form Trigger – A user…
Source: https://n8n.io/workflows/8174/ — original creator credit. Request a take-down →
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