{
  "title": "MongoDB Schema-Free Document Example",
  "description": "Example of a flexible schema document in MongoDB demonstrating the schemaless approach: embedded documents, arrays, mixed types, and application-level type discrimination.",
  "collection": "catalog",
  "document": {
    "_id": "64f8c9d12a3e4b5c6d7e8f90",
    "_type": "physical-product",
    "name": "Zebra ZD421 Direct Thermal Desktop Printer",
    "sku": "ZD42143-D0E000EZ",
    "manufacturer": "Zebra Technologies",
    "categories": ["Printers", "Label Printers", "Desktop Printers"],
    "pricing": {
      "msrp": 399.00,
      "distributor": 249.99,
      "currency": "USD",
      "tiers": [
        {"minQty": 1, "price": 249.99},
        {"minQty": 10, "price": 239.99},
        {"minQty": 25, "price": 229.99}
      ]
    },
    "specs": {
      "resolution": "203 dpi",
      "maxPrintWidth": 4.09,
      "maxPrintSpeed": 6,
      "interfaces": ["USB 2.0", "10/100 Ethernet", "Bluetooth 4.1"],
      "mediaTypes": ["Direct Thermal"],
      "operatingTemp": {"min": 41, "max": 104, "unit": "F"}
    },
    "inventory": {
      "quantityOnHand": 142,
      "warehouse": "Greenville-SC",
      "reorderPoint": 20,
      "leadTimeDays": 5
    },
    "images": [
      {"url": "https://cdn.example.com/products/zd421-front.jpg", "view": "front"},
      {"url": "https://cdn.example.com/products/zd421-side.jpg", "view": "side"}
    ],
    "isActive": true,
    "isObsolete": false,
    "tags": ["barcode", "label", "thermal", "desktop", "zebra"],
    "metadata": {
      "createdAt": "2024-03-15T10:00:00Z",
      "modifiedAt": "2026-05-01T14:30:00Z",
      "createdBy": "catalog-import",
      "version": 3
    }
  },
  "notes": "This document has no fixed schema — fields like 'specs', 'pricing.tiers', and 'images' are application-defined and could vary completely between documents of different _types in the same collection."
}