curl --request POST \
  --url https://api.iotools.cloud/v1/tool/weight-converter \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "value": "1",
  "fromUnit": "kilogram",
  "toUnit": "all",
  "precision": "4"
}
'

{
  "tool": "weight-converter",
  "tool_version": "1.0.1",
  "outputs": {
    "result": "",
    "table": [
      {
        "unit": "Kilogram (kg)",
        "value": "1"
      },
      {
        "unit": "Gram (g)",
        "value": "1000"
      },
      {
        "unit": "Milligram (mg)",
        "value": "1000000"
      },
      {
        "unit": "Microgram (μg)",
        "value": "1000000000"
      },
      {
        "unit": "Tonne (t)",
        "value": "0.001"
      },
      {
        "unit": "Pound (lb)",
        "value": "2.2046"
      },
      {
        "unit": "Ounce (oz)",
        "value": "35.274"
      },
      {
        "unit": "Stone (st)",
        "value": "0.1575"
      },
      {
        "unit": "Ton, US short (ton)",
        "value": "0.0011"
      },
      {
        "unit": "Metric Ton (MT)",
        "value": "0.001"
      },
      {
        "unit": "Carat (ct)",
        "value": "5000"
      },
      {
        "unit": "Atomic Mass Unit (u)",
        "value": "6.0221e+26"
      },
      {
        "unit": "Long Ton, UK (long ton)",
        "value": "0.001"
      },
      {
        "unit": "Short Hundredweight, US (sh cwt)",
        "value": "0.022"
      },
      {
        "unit": "Long Hundredweight, UK (long cwt)",
        "value": "0.0197"
      },
      {
        "unit": "Pennyweight (dwt)",
        "value": "643.0149"
      },
      {
        "unit": "Grain (gr)",
        "value": "15432.3584"
      }
    ]
  },
  "credits_used": 3,
  "credits_remaining": null
}