curl --request POST \
  --url https://api.iotools.cloud/v1/tool/file-extension-lookup \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "search": ".pdf",
  "searchMode": "ext",
  "popularity": "all"
}
'

{
  "tool": "file-extension-lookup",
  "tool_version": "1.0.1",
  "outputs": {
    "summary": "Showing 1 extension.",
    "results": [
      {
        "extension": ".pdf",
        "category": "Document",
        "popularity": "Common",
        "mime-type": "application/pdf",
        "description": "Portable Document Format",
        "opens-with": "Win: Adobe Acrobat, Chrome, SumatraPDF | Mac: Preview, Adobe Acrobat | Linux: Evince, Okular, Firefox"
      }
    ]
  },
  "credits_used": 3,
  "credits_remaining": null
}