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I have a base64 encoded image returned from a service and it looks like this:
/9j/4AAQSkZJRgABAQEASABIAAD/4Yp2aHR0cDovL25zLmFkb2JlLmNvbS94YXAvMS4wLwA8P3hwYWNrZXQgYmVnaW49Iu+7vyIgaWQ9Ilc1TTBNcENlaGlIenJlU3pOVGN6a2M5ZCI/Pgo8eDp4bXBtZXRhIHhtbG5zOng9ImFkb2JlOm5zOm1ldGEvIiB4OnhtcHRrPSJBZG9iZSBYTVAgQ29yZSA0LjEtYzAzNiA0Ni4yNzcwOTIsIEZyaSBGZWIgMjMgMjAwNyAxNDoxNjoxOCAgICAgICAgIj4KICAgPHJkZjpSREYgeG1.... etc How can i detect / check the image extension?
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'function guessImageMime(data){ if(data. charAt(0)=='/'){ return "image/jpeg"; }else if(data. charAt(0)=='R'){ return "image/gif"; }else if(data. charAt(0)=='i'){ return "image/png"; } }' Thanks for your answer.
Binary file encoded using base64 encoding; often used to convert text data into base64 data; enables more reliable transmission of e-mail attachments and other information; similar to a . MIME attachment.
A bit late but it seem the question was misunderstood. He just only had the base64 content of the image, not the full data URI.
I wrote here for anyone who encounters with this quest, you can read the first character of content content.charAt(0). By base64 image content if the first char is:
'/' : jpg
'i' : png
'R' : gif
'U' : webp
So for your case, it is 'jpg'.
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Was just tweaking with the string. May be this could help.
base64Data.substring("data:image/".length, base64Data.indexOf(";base64")) If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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