To save the photo permanently to the filesystem (blobs are objects temporarily loaded into browser memory), the Filesystem API requires the data to be in base64 format, so we must convert the blob into a base64 string. Here is an example that shows how you can use atob () to decode a Base64 encoding string: const encodedStr 'SmF2YVNjcmlwdCBpcyBmdW4hIQ' // decode the string const str atob( encodedStr) // print. To implement this, I used the Capacitor Camera and Filesystem APIs.Īfter taking a photo, the Camera API returns a blob URL, which looks like: Decoding Base64 to File/Image in JavaScript. The atob () function (stands for ASCII-to-binary) decodes a string of data encoded using Base64 encoding back to normal text in JavaScript. While entering a company expense, users take a photo of the expense receipt. I encountered this real-world example recently while building a feature for the Ionifits demo app. What about reversing the conversion, from a blob to a base64 string? Unfortunately, this is a bit more complicated (though if you know of a better approach, let me know in the comments!). Bonus: Converting a blob to a base64 string That’s it! From here, you can upload it to a server, display it on the screen, and more. Next, convert the response to a blob: const blob = await base64Response.blob() For example, a JPEG image: const base64Response = await fetch(`data:image/jpeg base64,$`) Easy as one, twoįirst, pass a base64 string to fetch: const base64Data = "aGV5IHRoZXJl" ĭepending on the format of the base64 string, you might need to prepend content type data. As it turns out, it can convert data into more than just JSON, it can also return array buffers, form data, and blobs. It’s a powerful feature built into all web browsers that is commonly used to fetch resources across the network, like making HTTP requests to your backend APIs.įetch returns a Response object. Fortunately, there’s an easier, modern approach available thanks to the Fetch API. I tried many libraries and solutions provided on SO, but Im still unable to decode the image correctly. Once the image has been decoded, the user can view. ![]() Users simply copy the Base64-encoded image string, paste it into the decoder's input field, and click the decode button to initiate the decoding process. What do you do?Īccording to various solutions around the Internet, conversion appears to be complex. Im trying to decode a base64 string representing an image stored in a db. Our Base64 to image online decoder tool allows you to quickly and easily convert Base64-encoded images to their original image format. ![]() However, the available API accepts the image in blob format only. Suppose you have an image in string format that needs to be uploaded to a server. A blob represents binary data in the form of files, such as images or video. One such example is converting a base64 string to a blob using JavaScript. However, using them correctly and effectively can be confusing.
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