What is the method for transforming a Base64 string into a javascript file object identical to the one generated from a file input form?

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To transform a Base64 string into a javascript file object that is identical to the one generated from a file input form, you can follow these steps:

1. Convert the Base64 string to a Blob object using the atob() method. For example:

var b64Data = "data:image/png;base64,iVBORw0K...";
var contentType = "image/png";
var byteCharacters = atob(b64Data.split(',')[1]);
var byteArrays = [];

for (var i = 0; i < byteCharacters.length; i++) {
    byteArrays.push(byteCharacters.charCodeAt(i));
}

var blob = new Blob([new Uint8Array(byteArrays)], {type: contentType});

1. Create a new File object by passing in the Blob object and the file name. For example:

var fileName = "myImage.png";
var file = new File([blob], fileName, {type: contentType});

Now you have a javascript file object that is identical to the one generated from a file input form, and you can use it in your code as needed.