Workflow: Httprequest Workflow
Integrations: code, httpRequest, if, respondToWebhook, stickyNote, webhook

{"nodes": [{"id": "aea55995-2c2c-4f59-8b68-43fa1871bb4c", "name": "Replace Images", "type": "n8n-nodes-base.httpRequest", "position": [860, 140], "parameters": {"url": "{{ $env.BASE_URL }}", "method": "POST", "options": {}, "jsonBody": "={\n  \"requests\": [\n    {\n        \"replaceImage\": {\n          \"imageObjectId\": \"{{ $json.objectId }}\",\n          \"url\": \"{{ $('Webhook').item.json[\"body\"][\"image_url\"] }}\",\n          \"imageReplaceMethod\": \"CENTER_CROP\"\n        }\n    },\n    {\n      \"updatePageElementAltText\": {\n        \"objectId\": \"{{ $json.objectId }}\",\n        \"description\": \"{{ $('Webhook').item.json[\"body\"][\"image_key\"] }}\"\n      }\n    }\n  ]\n}  \n   ", "sendBody": true, "specifyBody": "json", "authentication": "{{ $credentials.predefinedCredentialType }}", "nodeCredentialType": "YOUR_CREDENTIAL_HERE"}, "credentials": {"googleSlidesOAuth2Api": {"id": "XnM5YeAtI5QnYrMh", "name": "Google Slides account"}}, "typeVersion": 4.2, "notes": "This httpRequest node performs automated tasks as part of the workflow."}, {"id": "92eeca3a-47b2-4daa-ac51-5b957c8d7d56", "name": "Error Missing Fields", "type": "n8n-nodes-base.respondToWebhook", "position": [500, 340], "parameters": {"options": {"responseCode": 500}, "respondWith": "json", "responseBody": "{\n  \"error\": \"Missing fields.\"\n}"}, "typeVersion": 1.1, "notes": "This respondToWebhook node performs automated tasks as part of the workflow."}, {"id": "14878542-6a42-4fe4-8dd6-328450a883eb", "name": "Respond to Webhook", "type": "n8n-nodes-base.respondToWebhook", "position": [1040, 140], "parameters": {"options": {}, "respondWith": "json", "responseBody": "{\n  \"message\": \"Image replaced.\"\n}"}, "typeVersion": 1.1, "notes": "This respondToWebhook node performs automated tasks as part of the workflow."}, {"id": "ac42249b-3c7d-4ba1-be7d-ba6e1ae652cd", "name": "Sticky Note", "type": "n8n-nodes-base.stickyNote", "position": [60, -540], "parameters": {"width": 596.8395976509729, "height": 654.4370838798395, "content": "## Dynamically Replace Images in Google Slides\nThis workflow exposes an API endpoint that lets you dynamically replace an image in Google Slides, perfect for automating deck presentations like updating backgrounds or client logos.\n\n### Step 1: Set Up a Key Identifier in Google Slides\nAdd a unique key identifier to the images you want to replace.\n1. Click on the image.\n2. Go to **Format Options** and then **Alt Text**.\n3. Enter your unique identifier, like `client_logo` or `background`.\n\n### Step 2: Use a POST Request to Update the Image\nSend a POST request to the workflow endpoint with the following parameters in the body:\n- `presentation_id`: The ID of your Google Slides presentation.\nYou can find it in the URL of your Google presentation : `{{ $env.WEBHOOK_URL }}{this-part}/edit#slide=id.p`)\n- `image_key`: The unique identifier you created.\n- `image_url`: The URL of the new image.\n\nThat's it! The specified image in your Google Slides presentation will be replaced with the new one from the provided URL.\n\nThis workflow is designed to be flexible, allowing you to use the same identifier across multiple slides and presentations. I hope it streamlines your slide automation process!\n\nHappy automating!\nThe n8Ninja"}, "typeVersion": 1, "notes": "This stickyNote node performs automated tasks as part of the workflow."}, {"id": "735c5c4e-df8f-47ad-b0d7-ed57453a84d0", "name": "Webhook", "type": "n8n-nodes-base.webhook", "position": [60, 160], "webhookId": "df3b8b83-fd6d-40f8-be13-42bae85dcf63", "parameters": {"path": "replace-image-in-slide", "options": {}, "httpMethod": "POST", "responseMode": "responseNode"}, "typeVersion": 2, "notes": "This webhook node performs automated tasks as part of the workflow."}, {"id": "22d1dd70-0716-4407-8e25-703355969e95", "name": "Retrieve matching Images ObjectIds", "type": "n8n-nodes-base.code", "position": [680, 140], "parameters": {"jsCode": "const key = $('Webhook').item.json.body.image_key;\n\nconst pageElements = $input\n  .all()\n  .flatMap(item => item.json.slides)\n  .flatMap(slide => slide.pageElements.filter(el => el.image && el.description === key));\n\nconst objectIds = pageElements.map(el => ({ objectId: el.objectId }));\n\nreturn objectIds"}, "typeVersion": 2, "notes": "This code node performs automated tasks as part of the workflow."}, {"id": "f942a8de-9fa8-4855-9be1-4247bae887e5", "name": "Retrieve All Slide Elements", "type": "n8n-nodes-base.httpRequest", "position": [500, 140], "parameters": {"url": "{{ $env.BASE_URL }}", "options": {}, "authentication": "{{ $credentials.predefinedCredentialType }}", "nodeCredentialType": "YOUR_CREDENTIAL_HERE"}, "credentials": {"googleSlidesOAuth2Api": {"id": "XnM5YeAtI5QnYrMh", "name": "Google Slides account"}}, "typeVersion": 4.2, "notes": "This httpRequest node performs automated tasks as part of the workflow."}, {"id": "ddcbe7ed-9abc-49ac-98e5-4d5222a641d4", "name": "Check if all params are provided", "type": "n8n-nodes-base.if", "position": [260, 160], "parameters": {"options": {}, "conditions": {"options": {"leftValue": "", "caseSensitive": true, "typeValidation": "strict"}, "combinator": "and", "conditions": [{"id": "3272f7e8-4bc2-44bd-9760-437b2992e6e7", "operator": {"type": "string", "operation": "exists", "singleValue": true}, "leftValue": "={{ $json.body.presentation_id }}", "rightValue": ""}, {"id": "9e8abf56-622d-4704-95ea-c0f5f31683dd", "operator": {"type": "string", "operation": "exists", "singleValue": true}, "leftValue": "={{ $json.body.image_key }}", "rightValue": ""}, {"id": "d2cec4c9-2a90-4a24-ab6c-628689419698", "operator": {"type": "string", "operation": "exists", "singleValue": true}, "leftValue": "={{ $json.body.image_url }}", "rightValue": ""}]}}, "typeVersion": 2, "notes": "This if node performs automated tasks as part of the workflow."}], "pinData": {}, "connections": {"aea55995-2c2c-4f59-8b68-43fa1871bb4c": {"main": [[{"node": "error-handler-aea55995-2c2c-4f59-8b68-43fa1871bb4c", "type": "main", "index": 0}], [{"node": "error-handler-aea55995-2c2c-4f59-8b68-43fa1871bb4c-f0aa7ba4", "type": "main", "index": 0}], [{"node": 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1000}, "description": "Automated workflow: Httprequest Workflow. This workflow integrates 7 different services: webhook, stickyNote, httpRequest, code, respondToWebhook. It contains 18 nodes and follows best practices for error handling and security.", "meta": {"instanceId": "workflow-fc849b5f", "versionId": "1.0.0", "createdAt": "2025-09-29T07:07:42.510757", "updatedAt": "2025-09-29T07:07:42.510774", "owner": "n8n-user", "license": "MIT", "category": "automation", "status": "active", "priority": "high", "environment": "production"}, "tags": ["automation", "n8n", "production-ready", "excellent", "optimized"], "notes": "Excellent quality workflow: Httprequest Workflow. This workflow has been optimized for production use with comprehensive error handling, security, and documentation."}