Extract Real Estate Listings

{
  "type": "object",
  "properties": {
    "property_name": { "type": "string" },
    "address": { "type": "string" },
    "description": { "type": "string" },
    "total_units": { "type": "number" },
    "units": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "unit_number": { "type": "string" },
          "size_sqm": { "type": "number" },
          "rent_per_month": { "type": "number" },
          "rooms": { "type": "number" },
          "floor": { "type": "string" },
          "features": {
            "type": "array",
            "items": { "type": "string" }
          }
        },
        "required": ["unit_number", "size_sqm"],
        "additionalProperties": false
      }
    },
    "images": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "description": { "type": "string" },
          "location": { "type": "string" }
        },
        "additionalProperties": false
      }
    }
  },
  "required": ["property_name", "address"],
  "additionalProperties": false
}

struktur --input expose.pdf \
  --schema property-schema.json \
  --strategy sequentialAutoMerge \
  --model openai/gpt-4o-mini

import { extract, sequentialAutoMerge } from "@struktur/sdk";
import { openai } from "@ai-sdk/openai";
import { fileToArtifact } from "@struktur/sdk";
import fs from "node:fs/promises";

const buffer = Buffer.from(await fs.readFile("expose.pdf"));
const artifact = await fileToArtifact(buffer, { mimeType: "application/pdf" });

const result = await extract({
  artifacts: [artifact],
  schema: propertySchema,
  strategy: sequentialAutoMerge({
    model: openai("gpt-4o-mini"),
    dedupeModel: openai("gpt-4o-mini"),
    chunkSize: 8000,
  }),
});

console.log(result.data);

{
  "property_name": "Hauptstraße 42",
  "address": "Hauptstraße 42, 10115 Berlin",
  "description": "Mixed-use commercial and residential building...",
  "total_units": 8,
  "units": [
    {
      "unit_number": "1.1",
      "size_sqm": 85,
      "rent_per_month": 1200,
      "rooms": 3,
      "floor": "1st floor",
      "features": ["balcony", "parking space"]
    }
  ],
  "images": [
    { "description": "Building exterior", "location": "front page" },
    { "description": "Floor plan unit 1.1", "location": "page 3" }
  ]
}