curl --request POST \
  --url https://api.iotools.cloud/v1/tool/string-length-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "textContent": "😀"
}
'

{
  "tool": "string-length-calculator",
  "tool_version": "1.0.1",
  "outputs": {
    "stats": [
      {
        "metric": "JS String Length (UTF-16 code units)",
        "value": "2"
      },
      {
        "metric": "Unicode Character Count (Codepoints)",
        "value": "1"
      },
      {
        "metric": "Byte Length (UTF-8)",
        "value": "4"
      },
      {
        "metric": "Character Count (No Spaces)",
        "value": "1"
      },
      {
        "metric": "Word Count",
        "value": "1"
      },
      {
        "metric": "Line Count",
        "value": "1"
      }
    ]
  },
  "credits_used": 3,
  "credits_remaining": null
}