Checking Whether a Value is a URL or Not

To check whether the given value is url or not:

 if (imageFieldId) {
     let urlPattern = /^(https?|ftp|file):\/\/[\w-]+(\.[\w-]+)+([\w.,@?^=%&:/~+#-]*[\w@?^=%&/~+#-])?$/;
  // This line creates a regular expression 'urlPattern' that is used to validate URLs.
 // The regular expression checks for URLs starting with 'http://', 'https://', 'ftp://' or 'file://'.
 // It then matches the domain name, and optionally matches paths and query parameters.
      let imageContents;
      let curImageType;
      if (urlPattern.test(imageFieldId)) {
       // If the value is a URL, convert it to base64
       let imageData = convertUrlToBase64(imageFieldId);
       imageContents = imageData.base64Data;
       log.debug("imageContents url",imageContents);
       curImageType = imageData.imageType;
       log.debug("curImageType url",curImageType);
                                }

The code checks whether the variable imageFieldId contains a valid URL.

If it does, it converts the URL to base64 format using the convertUrlToBase64 function and then logs the resulting base64 data and image type.