Retrieve and Summarize Postgres Tables via Webhook

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 →

{
  "name": "Get Postgres Tables",
  "nodes": [
    {
      "parameters": {
        "options": {}
      },
      "id": "74a8e48c-c13f-450c-835e-1702d87f894c",
      "name": "Respond to Webhook",
      "type": "n8n-nodes-base.respondToWebhook",
      "typeVersion": 1.1,
      "position": [
        880,
        60
      ]
    },
    {
      "parameters": {
        "operation": "executeQuery",
        "query": "SELECT table_name \nFROM information_schema.tables\nWHERE table_schema = 'public'\n    AND table_type = 'BASE TABLE'\nORDER BY table_name;",
        "options": {}
      },
      "id": "2cd15801-ea79-4a53-b1be-c0470429966a",
      "name": "Postgres",
      "type": "n8n-nodes-base.postgres",
      "typeVersion": 2.5,
      "position": [
        400,
        60
      ],
      "credentials": {
        "postgres": {
          "name": "<your credential>"
        }
      }
    },
    {
      "parameters": {
        "fieldsToSummarize": {
          "values": [
            {
              "aggregation": "concatenate",
              "field": "table_name"
            }
          ]
        },
        "options": {}
      },
      "id": "8b66e814-e553-451c-818a-fc93699b341c",
      "name": "Summarize",
      "type": "n8n-nodes-base.summarize",
      "typeVersion": 1,
      "position": [
        640,
        60
      ]
    },
    {
      "parameters": {
        "path": "d8db9fa3-04fe-43c8-9acf-e1912463477f",
        "authentication": "headerAuth",
        "responseMode": "responseNode",
        "options": {}
      },
      "id": "3eb54a82-034c-4f3f-aa99-3b6aeb744ce2",
      "name": "Webhook",
      "type": "n8n-nodes-base.webhook",
      "typeVersion": 2,
      "position": [
        180,
        60
      ],
      "credentials": {
        "httpHeaderAuth": {
          "name": "<your credential>"
        }
      }
    }
  ],
  "connections": {
    "Postgres": {
      "main": [
        [
          {
            "node": "Summarize",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Summarize": {
      "main": [
        [
          {
            "node": "Respond to Webhook",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Webhook": {
      "main": [
        [
          {
            "node": "Postgres",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  },
  "active": true,
  "settings": {
    "executionOrder": "v1"
  },
  "versionId": "bd8d96b6-53e1-4cb9-8ee7-0c8be9b86dc9",
  "meta": {
    "templateCredsSetupCompleted": true
  },
  "id": "t15NIcuhUMXOE8DM",
  "tags": []
}

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.

• httpHeaderAuth
• postgres

About this workflow

Get Postgres Tables. Uses respondToWebhook, postgres, summarize. Webhook trigger; 4 nodes.

Source: https://github.com/daboi2331/ai-agents-masterclass/blob/main/local-ai-packaged/n8n-tool-workflows/Get_Postgres_Tables.json — original creator credit. Request a take-down →

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