Análisis de imágenes de Telegram con GPT-4o Vision y extracción de texto

• •Bot Token de Telegram
• •Pueden requerirse credenciales de autenticación para la API de destino

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  "nodes": [
    {
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      "name": "Nota adhesiva — Descripción general",
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      "parameters": {
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        "content": "# 📸 Telegram → AIMLAPI Vision Bot\n\nThis workflow receives photos from users in Telegram, \nencodes them to base64, and sends them to **AIMLAPI** \n(GPT-4o Vision) for analysis.\n\n---\n## 🚀 Features\n* Image content recognition\n* OCR (extract text from photos)\n* Concise description in the reply\n* Automatic response back to Telegram\n"
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      "typeVersion": 1
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    {
      "id": "fc3443dd-7c1d-478f-846b-e20b2d480898",
      "name": "Nota adhesiva — Guía de configuración",
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      "parameters": {
        "color": 5,
        "width": 560,
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        "content": "# 🛠 Setup Guide\n\n### 1. 📲 Create a Telegram Bot\n* In [@BotFather](https://t.me/BotFather) → /newbot\n* Save the API Token\n\n### 2. 🔐 Connect Telegram API in n8n\n* Go to Credentials → Telegram API\n* Paste the token from BotFather\n\n### 3. 🔌 Connect AIMLAPI\n* Go to Credentials → AI/ML API\n* Enter your API Key\n* Base URL: https://api.aimlapi.com/v1\n"
      },
      "typeVersion": 1
    },
    {
      "id": "a00ee4eb-0c89-48a2-87c1-000197b71a55",
      "name": "Nota adhesiva — Recibir mensaje",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        944,
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      ],
      "parameters": {
        "color": 3,
        "width": 384,
        "height": 448,
        "content": "# 📥 Step 1 — Receive Telegram Message\n\nListens for new messages in Telegram.\nExtracts:\n* chat.id (where to reply)\n* photo.file_id (photo file ID)\n"
      },
      "typeVersion": 1
    },
    {
      "id": "375019d6-a2c0-438c-950c-376603599dc5",
      "name": "Nota adhesiva — Procesamiento GPT‑5",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
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      ],
      "parameters": {
        "width": 384,
        "height": 448,
        "content": "# 📷 Step 2 — Get Photo\n\nFetches the file by `file_id` from Telegram.\nResult: binary photo data (jpg/jpeg/png).\n"
      },
      "typeVersion": 1
    },
    {
      "id": "e58d2186-f12e-43a4-9b7c-a644d27e64fa",
      "name": "Nota adhesiva — Enviar respuesta",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        2144,
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      ],
      "parameters": {
        "color": 4,
        "width": 384,
        "height": 448,
        "content": "# 🧩 Step 3 — Convert to base64\n\nConverts the binary file into a base64 string,\nwhich will be passed to AIMLAPI Vision.\n"
      },
      "typeVersion": 1
    },
    {
      "id": "06a31bfb-15af-40fe-b468-057cf985180f",
      "name": "Nota adhesiva — Registro",
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      "position": [
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      "parameters": {
        "color": 5,
        "width": 384,
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        "content": "# 🧠 Step 4 — AIMLAPI Vision\n\nMakes a request to AIMLAPI GPT-4o with:\n1. Instruction: \"Describe this image. Extract visible text.\"\n2. The base64 image passed as `image_url`.\n\nResult: description + OCR text.\n"
      },
      "typeVersion": 1
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    {
      "id": "7cc29371-2e04-440c-baea-4f7a716a5acf",
      "name": "Nota adhesiva — Recibir mensaje1",
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      "position": [
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      ],
      "parameters": {
        "color": 3,
        "width": 384,
        "height": 448,
        "content": "# 💬 Step 1.5 — Simulate Typing\n\nSends a \"typing…\" action to the user\nwhile the bot processes the photo.\n\nCreates a more natural user experience.\n"
      },
      "typeVersion": 1
    },
    {
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      "position": [
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      ],
      "parameters": {
        "color": 4,
        "width": 384,
        "height": 448,
        "content": "# 🧑‍💻 Step 3.5 — Normalize MIME\n\nJS code builds a proper Data URI:\n`data:image/jpeg;base64,...`\n\nTelegram sometimes returns `image/jpg` — \nthis is replaced with the standard `image/jpeg`.\n"
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      "parameters": {
        "color": 5,
        "width": 384,
        "height": 448,
        "content": "# 📤 Step 5 — Send Reply\n\nSends the model’s response back to the user \nin Telegram as a text message/caption.\n"
      },
      "typeVersion": 1
    },
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      "name": "Paso 1 · 📩 Disparador Telegram (Entrada)",
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      "parameters": {
        "updates": [
          "message"
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        "additionalFields": {}
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      "credentials": {
        "telegramApi": {
          "id": "cFC7gGbzU7PQGk6J",
          "name": "Telegram account"
        }
      },
      "typeVersion": 1.2
    },
    {
      "id": "969d9b61-fcab-4907-b670-ef12da530051",
      "name": "Paso 1.5 · 💬 Escribiendo…",
      "type": "n8n-nodes-base.telegram",
      "position": [
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      ],
      "webhookId": "a048d256-da8b-4302-bc9c-ad03955ef7af",
      "parameters": {
        "chatId": "={{ $json.message.chat.id }}",
        "operation": "sendChatAction"
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      "credentials": {
        "telegramApi": {
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    {
      "id": "e24fb8ae-5090-45b4-bc77-4d2ddb054245",
      "name": "Paso 2 · 📷 Obtener foto",
      "type": "n8n-nodes-base.telegram",
      "position": [
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      ],
      "webhookId": "94d3ad2f-9d08-414e-a323-7e56904768cf",
      "parameters": {
        "fileId": "={{ $('Step 1 · 📩 Telegram Trigger (In)').item.json.message.photo[$('Step 1 · 📩 Telegram Trigger (In)').item.json.message.photo.length - 1].file_id }}",
        "resource": "file",
        "additionalFields": {
          "mimeType": "image/jpeg"
        }
      },
      "credentials": {
        "telegramApi": {
          "id": "cFC7gGbzU7PQGk6J",
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    },
    {
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      "name": "Paso 3 · 🧩 Extraer → base64",
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        "options": {},
        "operation": "binaryToPropery"
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      "name": "Paso 3.5 · 🧑‍💻 Construir URI de datos",
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      "parameters": {
        "jsCode": "// Build a proper Data URI for Vision API\n// Base64 from previous node\nconst base64Data = $input.first().json.data;;\n\n// Telegram may report image/jpg; normalize to image/jpeg\nlet fixedMime = 'image/jpeg';\n\nreturn [{\n  dataUri: `data:${fixedMime};base64,${base64Data}`\n}];\n"
      },
      "typeVersion": 2
    },
    {
      "id": "dbc396b9-d19a-4f7a-a26a-77b60d3cc9bc",
      "name": "Paso 4 · 🧠 AIMLAPI Vision (HTTP)",
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      "parameters": {
        "url": "https://api.aimlapi.com/v1/chat/completions",
        "method": "POST",
        "options": {},
        "jsonBody": "={\n  \"model\": \"openai/gpt-4o\",\n  \"messages\": [\n    {\n      \"role\": \"user\",\n      \"content\": [\n        {\n          \"type\": \"text\",\n          \"text\": \"Describe this image. Then extract any visible text (OCR). Keep it concise.\"\n        },\n        {\n          \"type\": \"image_url\",\n          \"image_url\": {\n            \"url\": \"{{ $json.dataUri }}\"\n          }\n        }\n      ]\n    }\n  ],\n  \"max_tokens\": 300\n}",
        "sendBody": true,
        "specifyBody": "json",
        "authentication": "predefinedCredentialType",
        "nodeCredentialType": "aimlApi"
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      "credentials": {
        "aimlApi": {
          "id": "EXXHjMACiSMAhuC8",
          "name": "AI/ML account"
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      },
      "retryOnFail": true,
      "typeVersion": 4.2
    },
    {
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      "name": "Paso 5 · 📤 Responder a Telegram",
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      "webhookId": "78700f84-9668-4cf2-afb4-8e771a8c9d6a",
      "parameters": {
        "text": "={{ $json?.choices?.[0]?.message?.content || \"Sorry, the model returned an empty response.\" }}",
        "chatId": "={{ $('Step 1 · 📩 Telegram Trigger (In)').item.json.message.chat.id }}",
        "additionalFields": {
          "appendAttribution": false,
          "reply_to_message_id": "={{ $('Step 1 · 📩 Telegram Trigger (In)').item.json.message.message_id }}",
          "disable_web_page_preview": true
        }
      },
      "credentials": {
        "telegramApi": {
          "id": "cFC7gGbzU7PQGk6J",
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