{ "name": "AI LinkedIn Poster", "nodes": [ { "parameters": { "content": "## AI LinkedIn Poster v1.0\n\n`POST /webhook/linkedin-ai-post`\n\n1. Set env vars in **Configuration**\n2. Assign OpenAI + LinkedIn OAuth credentials\n3. Set `WEBHOOK_SECRET` for production\n4. Import `linkedin-ai-poster-errors.json` (optional)\n\nDocs: https://github.com/Ai-assistant-KIRA/n8n-ai-linkedin-poster", "height": 300, "width": 400, "color": 4 }, "id": "sticky-main", "name": "Workflow Notes", "type": "n8n-nodes-base.stickyNote", "typeVersion": 1, "position": [ -200, 80 ] }, { "parameters": { "content": "## Env vars\n| Variable | Required |\n|----------|----------|\n| `LINKEDIN_PERSON_ID` | \u2705 |\n| `WEBHOOK_SECRET` | prod \u2705 |\n| `LINKEDIN_API_VERSION` | optional (202502) |\n\n**Credentials:** OpenAI API, LinkedIn OAuth2", "height": 280, "width": 340, "color": 5 }, "id": "sticky-config", "name": "Configuration Notes", "type": "n8n-nodes-base.stickyNote", "typeVersion": 1, "position": [ 300, 60 ] }, { "parameters": { "httpMethod": "POST", "path": "linkedin-ai-post", "responseMode": "responseNode", "options": {} }, "id": "webhook", "name": "Webhook Trigger", "type": "n8n-nodes-base.webhook", "typeVersion": 2, "position": [ 240, 400 ], "notesInFlow": true, "notes": "Pass X-Webhook-Secret header when WEBHOOK_SECRET is set." }, { "parameters": { "mode": "manual", "duplicateItem": false, "assignments": { "assignments": [ { "id": "personId", "name": "personId", "value": "={{ $env.LINKEDIN_PERSON_ID || 'YOUR_PERSON_ID' }}", "type": "string" }, { "id": "linkedinApiVersion", "name": "linkedinApiVersion", "value": "={{ $env.LINKEDIN_API_VERSION || '202502' }}", "type": "string" }, { "id": "webhookSecret", "name": "webhookSecret", "value": "={{ $env.WEBHOOK_SECRET || '' }}", "type": "string" }, { "id": "httpMaxRetries", "name": "httpMaxRetries", "value": 3, "type": "number" } ] }, "options": {} }, "id": "configuration", "name": "Configuration", "type": "n8n-nodes-base.set", "typeVersion": 3.4, "position": [ 400, 400 ], "notesInFlow": true }, { "parameters": { "mode": "runOnceForAllItems", "language": "javaScript", "jsCode": "const raw = $input.first().json;\nconst body = raw.body ?? raw;\nconst headers = raw.headers || {};\nconst config = $('Configuration').first().json;\n\nconst topic = (body.topic || '').trim();\nconst caption = (body.caption || body.text || '').trim();\nconst imagePrompt = (body.image_prompt || body.imagePrompt || '').trim();\nconst imageUrl = (body.image_url || body.imageUrl || '').trim();\nconst imageBase64 = body.image_base64 || body.imageBase64 || null;\nconst tone = (body.tone || 'professional').trim();\nconst hashtags = Array.isArray(body.hashtags) ? body.hashtags : [];\nconst dryRun = Boolean(body.dry_run ?? body.dryRun ?? false);\nconst publish = body.publish !== false;\nconst forceImage = Boolean(body.generate_image ?? body.generateImage ?? false);\n\nconst secret = (config.webhookSecret || '').trim();\nif (secret && secret !== 'DISABLED') {\n const provided = (\n headers['x-webhook-secret'] ||\n headers['X-Webhook-Secret'] ||\n body.webhook_secret ||\n body.webhookSecret ||\n ''\n ).trim();\n if (provided !== secret) {\n return [{\n json: {\n unauthorized: true,\n success: false,\n error: 'Invalid or missing X-Webhook-Secret header',\n hint: 'Set WEBHOOK_SECRET in env and pass header X-Webhook-Secret on every request.',\n },\n }];\n }\n}\n\nconst hasImageUrl = !!imageUrl;\nconst hasImageBase64 = !!imageBase64;\nconst skipAiImage = dryRun && !forceImage;\nconst needsAiImage = !hasImageUrl && !hasImageBase64 && !skipAiImage && (imagePrompt || topic || forceImage);\nconst needsCaption = !caption && (topic || body.generate_caption);\nconst shouldPost = !dryRun && publish;\nconst captionOnlyPreview = dryRun && !hasImageUrl && !hasImageBase64 && !needsAiImage;\n\nreturn [{\n json: {\n topic,\n caption,\n imagePrompt: imagePrompt || (topic ? `Professional LinkedIn infographic about: ${topic}. Clean, modern, high-contrast, no text overlays.` : ''),\n imageUrl,\n imageBase64,\n tone,\n hashtags,\n dryRun,\n publish,\n shouldPost,\n forceImage,\n needsCaption,\n hasImageUrl,\n hasImageBase64,\n needsAiImage,\n captionOnlyPreview,\n personId: config.personId,\n linkedinApiVersion: config.linkedinApiVersion,\n httpMaxRetries: config.httpMaxRetries,\n mediaTitle: (body.media_title || body.mediaTitle || topic || 'AI Generated Post').slice(0, 200),\n visibility: body.visibility || 'PUBLIC',\n },\n}];" }, "id": "parse", "name": "Parse Webhook Input", "type": "n8n-nodes-base.code", "typeVersion": 2, "position": [ 580, 400 ], "onError": "continueErrorOutput", "notesInFlow": true }, { "parameters": { "conditions": { "options": { "caseSensitive": true, "leftValue": "", "typeValidation": "strict" }, "conditions": [ { "id": "unauth", "leftValue": "={{ $json.unauthorized }}", "rightValue": true, "operator": { "type": "boolean", "operation": "equals" } } ], "combinator": "and" }, "options": {} }, "id": "if-unauthorized", "name": "Unauthorized?", "type": "n8n-nodes-base.if", "typeVersion": 2, "position": [ 760, 400 ] }, { "parameters": { "conditions": { "options": { "caseSensitive": true, "leftValue": "", "typeValidation": "strict" }, "conditions": [ { "id": "c", "leftValue": "={{ $json.needsCaption }}", "rightValue": true, "operator": { "type": "boolean", "operation": "equals" } } ], "combinator": "and" }, "options": {} }, "id": "if-needs-caption", "name": "Needs Caption?", "type": "n8n-nodes-base.if", "typeVersion": 2, "position": [ 960, 400 ] }, { "parameters": { "resource": "chat", "operation": "complete", "chatModel": "gpt-4o-mini", "prompt": { "messages": [ { "role": "system", "content": "You write high-performing LinkedIn posts. Output ONLY the post text \u2014 no titles, no markdown fences. Use short paragraphs, 1-2 emojis max, 3-5 relevant hashtags at the end." }, { "role": "user", "content": "=Write a LinkedIn post.\n\nTopic: {{ $json.topic || 'automation and AI productivity' }}\nTone: {{ $json.tone }}\nExtra hashtags: {{ $json.hashtags.join(' ') }}\n\nKeep under 1300 characters. Start with a strong hook." } ] }, "options": { "temperature": 0.7, "maxTokens": 800 } }, "id": "openai-caption", "name": "AI Generate Caption", "type": "@n8n/n8n-nodes-langchain.openAi", "typeVersion": 1.8, "position": [ 1180, 280 ], "onError": "continueErrorOutput", "credentials": { "openAiApi": { "name": "" } } }, { "parameters": { "mode": "runOnceForAllItems", "language": "javaScript", "jsCode": "const parsed = $('Parse Webhook Input').first().json;\nconst ai = $input.first().json;\nconst generated = ai.message?.content || ai.text || ai.output || '';\nif (!parsed.caption && !generated.trim()) throw new Error('AI caption generation returned empty text.');\nreturn [{ json: { ...parsed, caption: (parsed.caption || generated).trim(), captionSource: parsed.caption ? 'provided' : 'ai-generated' } }];" }, "id": "merge-caption", "name": "Merge Caption", "type": "n8n-nodes-base.code", "typeVersion": 2, "position": [ 1400, 280 ], "onError": "continueErrorOutput" }, { "parameters": { "mode": "runOnceForAllItems", "language": "javaScript", "jsCode": "const p = $input.first().json; return [{ json: { ...p, captionSource: 'provided' } }];" }, "id": "pass-caption", "name": "Use Provided Caption", "type": "n8n-nodes-base.code", "typeVersion": 2, "position": [ 1180, 520 ] }, { "parameters": { "mode": "combine", "combineBy": "combineAll", "options": {} }, "id": "merge-branches", "name": "Merge Caption Branches", "type": "n8n-nodes-base.merge", "typeVersion": 3, "position": [ 1620, 400 ] }, { "parameters": { "conditions": { "options": { "caseSensitive": true, "leftValue": "", "typeValidation": "strict" }, "conditions": [ { "id": "b", "leftValue": "={{ $json.hasImageBase64 }}", "rightValue": true, "operator": { "type": "boolean", "operation": "equals" } } ], "combinator": "and" }, "options": {} }, "id": "if-base64", "name": "Has Base64 Image?", "type": "n8n-nodes-base.if", "typeVersion": 2, "position": [ 1840, 400 ] }, { "parameters": { "mode": "runOnceForAllItems", "language": "javaScript", "jsCode": "const item = $input.first().json;\nconst raw = item.imageBase64 || '';\nconst dataUriMatch = raw.match(/^data:(image\\/[a-zA-Z0-9.+-]+);base64,(.+)$/);\nconst mimeType = dataUriMatch ? dataUriMatch[1] : 'image/jpeg';\nconst b64 = dataUriMatch ? dataUriMatch[2] : raw.replace(/^data:image\\/\\w+;base64,/, '');\nif (!b64) throw new Error('image_base64 is empty');\nconst ext = mimeType.includes('png') ? 'png' : 'jpg';\nreturn [{\n json: { ...item, imageSource: 'base64' },\n binary: {\n data: {\n data: b64,\n mimeType,\n fileName: `linkedin-post.${ext}`,\n },\n },\n}];" }, "id": "decode-base64", "name": "Decode Base64 Image", "type": "n8n-nodes-base.code", "typeVersion": 2, "position": [ 2060, 280 ], "onError": "continueErrorOutput" }, { "parameters": { "conditions": { "options": { "caseSensitive": true, "leftValue": "", "typeValidation": "strict" }, "conditions": [ { "id": "u", "leftValue": "={{ $json.hasImageUrl }}", "rightValue": true, "operator": { "type": "boolean", "operation": "equals" } } ], "combinator": "and" }, "options": {} }, "id": "if-url", "name": "Has Image URL?", "type": "n8n-nodes-base.if", "typeVersion": 2, "position": [ 2060, 480 ] }, { "parameters": { "url": "={{ $json.imageUrl }}", "options": { "response": { "response": { "responseFormat": "file" } } } }, "id": "download-url", "name": "Download Image URL", "type": "n8n-nodes-base.httpRequest", "typeVersion": 4.2, "position": [ 2280, 400 ], "retryOnFail": true, "maxTries": 3, "waitBetweenTries": 2000, "onError": "continueErrorOutput" }, { "parameters": { "conditions": { "options": { "caseSensitive": true, "leftValue": "", "typeValidation": "strict" }, "conditions": [ { "id": "a", "leftValue": "={{ $json.needsAiImage }}", "rightValue": true, "operator": { "type": "boolean", "operation": "equals" } } ], "combinator": "and" }, "options": {} }, "id": "if-ai-image", "name": "Needs AI Image?", "type": "n8n-nodes-base.if", "typeVersion": 2, "position": [ 2280, 580 ] }, { "parameters": { "resource": "image", "operation": "generate", "prompt": "={{ $json.imagePrompt }}", "options": { "size": "1024x1024", "style": "vivid" } }, "id": "openai-image", "name": "AI Generate Image", "type": "@n8n/n8n-nodes-langchain.openAi", "typeVersion": 1.8, "position": [ 2500, 500 ], "onError": "continueErrorOutput", "credentials": { "openAiApi": { "name": "" } } }, { "parameters": { "url": "={{ $json.data[0].url || $json.url }}", "options": { "response": { "response": { "responseFormat": "file" } } } }, "id": "download-ai", "name": "Download AI Image", "type": "n8n-nodes-base.httpRequest", "typeVersion": 4.2, "position": [ 2720, 500 ], "retryOnFail": true, "maxTries": 3, "waitBetweenTries": 2000, "onError": "continueErrorOutput" }, { "parameters": { "conditions": { "options": { "caseSensitive": true, "leftValue": "", "typeValidation": "strict" }, "conditions": [ { "id": "co", "leftValue": "={{ $json.captionOnlyPreview }}", "rightValue": true, "operator": { "type": "boolean", "operation": "equals" } } ], "combinator": "and" }, "options": {} }, "id": "if-caption-only", "name": "Caption Only Preview?", "type": "n8n-nodes-base.if", "typeVersion": 2, "position": [ 2500, 700 ] }, { "parameters": { "mode": "runOnceForAllItems", "language": "javaScript", "jsCode": "const item = $input.first().json;\nif (!item.caption && !item.topic) {\n throw new Error('Preview requires a topic or caption.');\n}\nreturn [{\n json: {\n success: true,\n dryRun: true,\n captionOnly: true,\n caption: item.caption || `(caption will be AI-generated from topic: ${item.topic})`,\n captionSource: item.captionSource || (item.caption ? 'provided' : 'ai-generated'),\n imageSource: null,\n imageSkipped: true,\n mediaTitle: item.mediaTitle,\n linkedinApiVersion: item.linkedinApiVersion,\n message: 'Caption-only preview \u2014 set generate_image: true to preview with AI image, or dry_run: false to publish.',\n },\n}];" }, "id": "caption-preview", "name": "Build Caption Preview", "type": "n8n-nodes-base.code", "typeVersion": 2, "position": [ 2720, 820 ], "onError": "continueErrorOutput" }, { "parameters": { "mode": "runOnceForAllItems", "language": "javaScript", "jsCode": "const content = $('Merge Caption Branches').first().json;\nconst input = $input.first();\nconst binary = input.binary;\n\nif (!binary) {\n throw new Error('No image binary available. Provide image_url, image_base64, or enable AI image generation.');\n}\n\nconst binaryKey = Object.keys(binary).find((k) => binary[k]?.data) || 'data';\nconst bin = binary[binaryKey];\nif (!bin?.data) throw new Error('Image binary is empty.');\n\nlet imageContentType = bin.mimeType || 'application/octet-stream';\nconst fileName = bin.fileName || 'linkedin-post.jpg';\nif (!imageContentType || imageContentType === 'application/octet-stream') {\n const ext = (fileName.split('.').pop() || 'jpg').toLowerCase();\n const map = { jpg: 'image/jpeg', jpeg: 'image/jpeg', png: 'image/png', gif: 'image/gif', webp: 'image/webp' };\n imageContentType = map[ext] || 'image/jpeg';\n}\n\nconst linkedinAccepted = ['image/jpeg', 'image/png'];\nconst imageFormatWarning = linkedinAccepted.includes(imageContentType)\n ? null\n : `LinkedIn accepts JPEG/PNG only. Detected ${imageContentType}. Add a conversion step or override to image/jpeg.`;\n\nconst personId = (content.personId || '').trim();\nif (!personId || personId === 'YOUR_PERSON_ID') {\n throw new Error('Set LINKEDIN_PERSON_ID in docker-compose/.env or the Configuration node.');\n}\n\nconst imageSource = content.imageSource || (content.imageUrl ? 'url' : content.imageBase64 ? 'base64' : 'ai-generated');\n\nreturn [{\n json: {\n ...content,\n personUrn: `urn:li:person:${personId}`,\n imageFileName: fileName,\n imageContentType,\n imageFormatWarning,\n imageSource,\n linkedinApiVersion: content.linkedinApiVersion || '202502',\n },\n binary: { data: bin },\n}];" }, "id": "prepare", "name": "Prepare LinkedIn Payload", "type": "n8n-nodes-base.code", "typeVersion": 2, "position": [ 2940, 400 ], "onError": "continueErrorOutput", "notesInFlow": true }, { "parameters": { "conditions": { "options": { "caseSensitive": true, "leftValue": "", "typeValidation": "strict" }, "conditions": [ { "id": "sp", "leftValue": "={{ $json.shouldPost }}", "rightValue": true, "operator": { "type": "boolean", "operation": "equals" } } ], "combinator": "and" }, "options": {} }, "id": "if-should-post", "name": "Should Post?", "type": "n8n-nodes-base.if", "typeVersion": 2, "position": [ 3160, 400 ] }, { "parameters": { "respondWith": "json", "responseBody": "={{ $json.captionOnly ? $json : { success: true, dryRun: true, caption: $json.caption, captionSource: $json.captionSource, imageSource: $json.imageSource, imageContentType: $json.imageContentType, imageFormatWarning: $json.imageFormatWarning, mediaTitle: $json.mediaTitle, linkedinApiVersion: $json.linkedinApiVersion, message: 'Preview only \u2014 set dry_run: false and publish: true to post.' } }}", "options": { "responseCode": 200 } }, "id": "respond-preview", "name": "Respond Preview", "type": "n8n-nodes-base.respondToWebhook", "typeVersion": 1.1, "position": [ 3380, 280 ] }, { "parameters": { "method": "POST", "url": "https://api.linkedin.com/rest/images?action=initializeUpload", "authentication": "predefinedCredentialType", "nodeCredentialType": "linkedInOAuth2Api", "sendHeaders": true, "headerParameters": { "parameters": [ { "name": "LinkedIn-Version", "value": "={{ $json.linkedinApiVersion || '202502' }}" }, { "name": "X-Restli-Protocol-Version", "value": "2.0.0" } ] }, "sendBody": true, "specifyBody": "json", "jsonBody": "={{ JSON.stringify({ initializeUploadRequest: { owner: $json.personUrn } }) }}", "options": {} }, "id": "linkedin-init", "name": "LinkedIn Init Upload", "type": "n8n-nodes-base.httpRequest", "typeVersion": 4.2, "position": [ 3380, 520 ], "retryOnFail": true, "maxTries": 3, "waitBetweenTries": 3000, "onError": "continueErrorOutput", "credentials": { "linkedInOAuth2Api": { "name": "" } } }, { "parameters": { "mode": "runOnceForAllItems", "language": "javaScript", "jsCode": "const prepared = $('Prepare LinkedIn Payload').first();\nconst init = $input.first();\nconst value = init.json.value || init.json.body?.value || init.json;\nif (!value?.uploadUrl || !value?.image) throw new Error(`LinkedIn init upload failed: ${JSON.stringify(init.json).slice(0, 500)}`);\nreturn [{ json: { ...prepared.json, uploadUrl: value.uploadUrl, imageUrn: value.image }, binary: prepared.binary }];" }, "id": "merge-upload", "name": "Merge Upload Data", "type": "n8n-nodes-base.code", "typeVersion": 2, "position": [ 3600, 520 ], "onError": "continueErrorOutput" }, { "parameters": { "method": "PUT", "url": "={{ $json.uploadUrl }}", "sendHeaders": true, "headerParameters": { "parameters": [ { "name": "Content-Type", "value": "={{ $json.imageContentType || 'image/jpeg' }}" } ] }, "sendBody": true, "contentType": "binaryData", "inputDataFieldName": "data", "options": {} }, "id": "linkedin-upload", "name": "LinkedIn Upload Image", "type": "n8n-nodes-base.httpRequest", "typeVersion": 4.2, "position": [ 3820, 520 ], "retryOnFail": true, "maxTries": 3, "waitBetweenTries": 3000, "onError": "continueErrorOutput" }, { "parameters": { "method": "POST", "url": "https://api.linkedin.com/rest/posts", "authentication": "predefinedCredentialType", "nodeCredentialType": "linkedInOAuth2Api", "sendHeaders": true, "headerParameters": { "parameters": [ { "name": "LinkedIn-Version", "value": "={{ $('Merge Upload Data').first().json.linkedinApiVersion || '202502' }}" }, { "name": "X-Restli-Protocol-Version", "value": "2.0.0" } ] }, "sendBody": true, "specifyBody": "json", "jsonBody": "={{ JSON.stringify({ author: $('Merge Upload Data').first().json.personUrn, commentary: $('Merge Upload Data').first().json.caption, visibility: $('Merge Upload Data').first().json.visibility, distribution: { feedDistribution: 'MAIN_FEED', thirdPartyDistributionChannels: [] }, lifecycleState: 'PUBLISHED', content: { media: { title: $('Merge Upload Data').first().json.mediaTitle, id: $('Merge Upload Data').first().json.imageUrn } } }) }}", "options": { "response": { "response": { "fullResponse": true } } } }, "id": "linkedin-post", "name": "LinkedIn Create Post", "type": "n8n-nodes-base.httpRequest", "typeVersion": 4.2, "position": [ 4040, 520 ], "retryOnFail": true, "maxTries": 3, "waitBetweenTries": 3000, "onError": "continueErrorOutput", "credentials": { "linkedInOAuth2Api": { "name": "" } } }, { "parameters": { "mode": "runOnceForAllItems", "language": "javaScript", "jsCode": "const merged = $('Merge Upload Data').first().json;\nconst post = $input.first();\nconst headers = post.json.headers || {};\nconst postUrn = headers['x-restli-id'] || headers['X-Restli-Id'];\nif (!postUrn) throw new Error('LinkedIn create post missing x-restli-id header');\nreturn [{ json: { success: true, dryRun: false, postUrn, shareUrl: `https://www.linkedin.com/feed/update/${encodeURIComponent(postUrn)}/`, caption: merged.caption, captionSource: merged.captionSource, imageSource: merged.imageSource, imageContentType: merged.imageContentType, mediaTitle: merged.mediaTitle, linkedinApiVersion: merged.linkedinApiVersion, api: `linkedin-rest-v${merged.linkedinApiVersion || '202502'}` } }];" }, "id": "finalize", "name": "Finalize Result", "type": "n8n-nodes-base.code", "typeVersion": 2, "position": [ 4260, 520 ], "onError": "continueErrorOutput" }, { "parameters": { "respondWith": "json", "responseBody": "={{ $json }}", "options": { "responseCode": 200 } }, "id": "respond-success", "name": "Respond Success", "type": "n8n-nodes-base.respondToWebhook", "typeVersion": 1.1, "position": [ 4480, 520 ] }, { "parameters": { "mode": "runOnceForAllItems", "language": "javaScript", "jsCode": "const item = $input.first();\nconst j = item.json || {};\nif (j.unauthorized) {\n return [{ json: { ...j, statusCode: 401 } }];\n}\nconst executionError = j.error || j;\nconst message =\n executionError.message ||\n executionError.description ||\n j.message ||\n (typeof executionError === 'string' ? executionError : null) ||\n 'Workflow execution failed';\nreturn [{\n json: {\n success: false,\n error: String(message).slice(0, 1000),\n failedNode: String(j.$node?.name || j.node || 'unknown'),\n hint: 'See docs/troubleshooting.md \u2014 verify LINKEDIN_PERSON_ID, OAuth, WEBHOOK_SECRET, LINKEDIN_API_VERSION.',\n docs: 'https://github.com/Ai-assistant-KIRA/n8n-ai-linkedin-poster/blob/main/docs/troubleshooting.md',\n statusCode: j.statusCode || 500,\n },\n}];" }, "id": "format-error", "name": "Format Error Response", "type": "n8n-nodes-base.code", "typeVersion": 2, "position": [ 4260, 720 ] }, { "parameters": { "conditions": { "options": { "caseSensitive": true, "leftValue": "", "typeValidation": "strict" }, "conditions": [ { "id": "e401", "leftValue": "={{ $json.statusCode }}", "rightValue": 401, "operator": { "type": "number", "operation": "equals" } } ], "combinator": "and" }, "options": {} }, "id": "if-error-code", "name": "Error Status?", "type": "n8n-nodes-base.if", "typeVersion": 2, "position": [ 4480, 720 ] }, { "parameters": { "respondWith": "json", "responseBody": "={{ $json }}", "options": { "responseCode": 500 } }, "id": "respond-error", "name": "Respond Error", "type": "n8n-nodes-base.respondToWebhook", "typeVersion": 1.1, "position": [ 4700, 820 ] }, { "parameters": { "respondWith": "json", "responseBody": "={{ $json }}", "options": { "responseCode": 401 } }, "id": "respond-unauthorized", "name": "Respond Unauthorized", "type": "n8n-nodes-base.respondToWebhook", "typeVersion": 1.1, "position": [ 4700, 620 ] }, { "parameters": { "mode": "runOnceForAllItems", "language": "javaScript", "jsCode": "throw new Error('Image required to publish. 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