curl --request POST \
  --url https://api.iotools.cloud/v1/tool/responsive-image-srcset-sizes-generator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "imageUrl": "/images/photo-{w}.jpg",
  "widths": "320, 640, 960, 1280, 1920",
  "sizes": "(max-width: 600px) 100vw, (max-width: 1200px) 50vw, 33vw",
  "alt": "A mountain landscape at sunrise",
  "lazy": "true"
}
'

{
  "tool": "responsive-image-srcset-sizes-generator",
  "tool_version": "1.0.1",
  "outputs": {
    "srcset": "/images/photo-320.jpg 320w,\n/images/photo-640.jpg 640w,\n/images/photo-960.jpg 960w,\n/images/photo-1280.jpg 1280w,\n/images/photo-1920.jpg 1920w",
    "sizesOutput": "(max-width: 600px) 100vw, (max-width: 1200px) 50vw, 33vw",
    "imgTag": "<img\n  src=\"/images/photo-1920.jpg\"\n  srcset=\"/images/photo-320.jpg 320w,\n/images/photo-640.jpg 640w,\n/images/photo-960.jpg 960w,\n/images/photo-1280.jpg 1280w,\n/images/photo-1920.jpg 1920w\"\n  sizes=\"(max-width: 600px) 100vw, (max-width: 1200px) 50vw, 33vw\"\n  alt=\"A mountain landscape at sunrise\"\n  loading=\"lazy\"\n  decoding=\"async\"\n/>"
  },
  "credits_used": 3,
  "credits_remaining": null
}