Converting the file to a string:
const reader = new FileReader()
reader.readAsText(file, 'UTF-8')
reader.onload = (event) => {
this.textFile = event.target.result
};
Upon uploading a Zip, Text, or Image file, my string appears as:
data:text/plain;base64,VTJGc.....Is there a way to reverse the conversion from text back to a downloadable file?
If you've received a "string" in Base64 URL format, it's actually a simplified way to download the file. Just copy and paste it into a new browser tab to view the contents without reversing the process.
To initiate the download, you can create a link element in your HTML like this:
Please note that the example below may not work if embedded with limited permissions.
function download(b64, name) {
const a = document.createElement("a");
a.href = b64;
a.download = name;
document.body.appendChild(a);
a.click();
}
download("data:text;base64,SGVsbG8sIHdvcmxkIQ==", "helloworld.txt");If you decide to decode the Base64 string back to its original form, you can use the atob() function as shown:
const decode = str =>
atob(str.replace(/^data:\w+;base64,/, "")); // remove `data:text;base64,`
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