Generate a packing slip from JSON

Most commerce stacks already serialize the order. The remaining work is usually a designer, a Word template, or an HTML page that nobody wants to maintain. Slipmill skips that. You map order, ship-to, and items into the packing-slip schema and POST.

Use the sample payloads and the JSON validator to check the shape before you wire production. Then call /v1/render. One request is one PDF. Fail closed on a bad key or a bad body.

This is generate-from-JSON, not generate-from-a-blank-form. There is no wizard. There is a schema. The live US Letter file is at /sample.

The payload

This is a packing-slip body. POST it to /v1/render with x-sm-key. The live PDF is at /sample.

{
  "template": "packing-slip",
  "brand": {
    "name": "Northline Goods",
    "accent": "#9E2A22",
    "address": "18 Mercer Street\nHoboken, NJ 07030"
  },
  "data": {
    "order_id": "NL-10428",
    "date": "2026-08-31",
    "ship_to": {
      "name": "Cedar & Pine Outfitters",
      "address": "440 Warehouse Ave, Dock 3",
      "city": "Newark",
      "region": "NJ",
      "postal": "07105",
      "country": "US"
    },
    "from": {
      "name": "Northline Goods",
      "address": "18 Mercer Street\nHoboken, NJ 07030"
    },
    "items": [
      {
        "sku": "TOTE-12",
        "name": "Canvas tote — natural",
        "qty": 12
      },
      {
        "sku": "INK-RED",
        "name": "Stamp pad, warehouse red",
        "qty": 2
      },
      {
        "sku": "TWILL-01",
        "name": "Twill apron",
        "qty": 4
      }
    ],
    "notes": "Leave on dock if closed. Pack totes upright.",
    "tracking": "1Z999AA10123456784"
  }
}

curl -X POST https://slipmill.com/v1/render \
  -H "x-sm-key: YOUR_SLIPMILL_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "template": "packing-slip",
    "brand": {
      "name": "Northline Goods",
      "accent": "#9E2A22",
      "address": "18 Mercer Street, Hoboken, NJ 07030"
    },
    "data": {
      "order_id": "NL-10428",
      "date": "2026-08-31",
      "ship_to": {
        "name": "Cedar & Pine Outfitters",
        "address": "440 Warehouse Ave, Dock 3",
        "city": "Newark",
        "region": "NJ",
        "postal": "07105",
        "country": "US"
      },
      "from": {
        "name": "Northline Goods",
        "address": "18 Mercer Street, Hoboken, NJ 07030"
      },
      "items": [
        { "sku": "TOTE-12", "name": "Canvas tote — natural", "qty": 12 }
      ]
    }
  }' \
  --output packing-slip.pdf