How to convert Base64 String to javascript file object like as from file input form?
I want to convert Base64String extracted from file(ex: "AAAAA....~") to a javascript file object.
The javascript file object what I mean is like this code:
HTML:
<input type="file" id="selectFile" >
JS:
$('#selectFile').on('change', function(e) {
var file = e.target.files[0];
console.log(file)
}
'file' variable is a javascript file object. So I want to convert a base64 string to the javascript file object like that.
I just want to get file object by decoding base64 string (encoded by other app from a file) without html file input form.
Thank you.
Solution 1:
Way 1: only works for dataURL, not for other types of url.
function dataURLtoFile(dataurl, filename) {
var arr = dataurl.split(','),
mime = arr[0].match(/:(.*?);/)[1],
bstr = atob(arr[1]),
n = bstr.length,
u8arr = new Uint8Array(n);
while(n--){
u8arr[n] = bstr.charCodeAt(n);
}
return new File([u8arr], filename, {type:mime});
}
//Usage example:
var file = dataURLtoFile('data:text/plain;base64,aGVsbG8gd29ybGQ=','hello.txt');
console.log(file);Way 2: works for any type of url, (http url, dataURL, blobURL, etc...)
//return a promise that resolves with a File instance
function urltoFile(url, filename, mimeType){
return (fetch(url)
.then(function(res){return res.arrayBuffer();})
.then(function(buf){return new File([buf], filename,{type:mimeType});})
);
}
//Usage example:
urltoFile('data:text/plain;base64,aGVsbG8gd29ybGQ=', 'hello.txt','text/plain')
.then(function(file){ console.log(file);});Solution 2:
const url = 'data:image/png;base6....';
fetch(url)
.then(res => res.blob())
.then(blob => {
const file = new File([blob], "File name",{ type: "image/png" })
})
Base64 String -> Blob -> File.