imagetype.js

function imageType(format) {
  switch (format.toUpperCase()) {
    case "JPEG":
    case "JPG":
      return { format: "JPEG", ext: "jpg", mimetype: "image/jpeg" }
    case "PNG":
      return { format: "PNG", ext: "png", mimetype: "image/png" }
    case "GIF":
      return { format: "GIF", ext: "gif", mimetype: "image/gif" }
    case "SVG":
      return { format: "SVG", ext: "svg", mimetype: "image/svg+xml" }
    case "ICO":
      return { format: "ICO", ext: "ico", mimetype: "image/x-icon" }
    case "WEBP":
      return { format: "WEBP", ext: "webp", mimetype: "image/webp" }
    case "TIFF":
    case "TIF":
      return { format: "TIFF", ext: "tif", mimetype: "image/tiff" }
    case "PSD":
      return { format: "PSD", ext: "psd", mimetype: "image/vnd.adobe.photoshop" }
    case "PDF":
      return { format: "PDF", ext: "pdf", mimetype: "application/pdf" }
    default:
      return null;
  }
}