curl --request POST \
  --url https://api.iotools.cloud/v1/tool/csv-column-extractor \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "csvSource": "name,age,city,department,salary\nAlice Johnson,30,New York,Engineering,95000\nBob Smith,25,Los Angeles,Marketing,72000\n\"Smith, Carol\",35,\"San Francisco\",Engineering,110000\nDavid Lee,28,Chicago,Sales,68000",
  "delimiter": ",",
  "firstRowHeaders": "true",
  "columns": "name,city"
}
'

{
  "tool": "csv-column-extractor",
  "tool_version": "1.0.1",
  "outputs": {
    "output": "name,city\nAlice Johnson,New York\nBob Smith,Los Angeles\n\"Smith, Carol\",San Francisco\nDavid Lee,Chicago",
    "preview": [
      [
        "name",
        "city"
      ],
      [
        "Alice Johnson",
        "New York"
      ],
      [
        "Bob Smith",
        "Los Angeles"
      ],
      [
        "Smith, Carol",
        "San Francisco"
      ],
      [
        "David Lee",
        "Chicago"
      ]
    ]
  },
  "credits_used": 3,
  "credits_remaining": null
}