Write Base64(pdf) to File (pdf) in UI Builder

[vladimir-upirov]

I see,

The server expects a file instance where the file type is specified

so to save a pdf file you need

1. convert your base64 to bytes array
2. create a Blob instance with application/pdf
3. send it to the server

code of the custom code block:

function _base64ToArrayBuffer(data) {
    var binary_string = window.atob(data);
    var len = binary_string.length;
    var bytes = new Uint8Array(len);
    
    for (var i = 0; i < len; i++) {
        bytes[i] = binary_string.charCodeAt(i);
    }
    
    return bytes.buffer;
}

var pdfData = _base64ToArrayBuffer(base64);

return new Blob([pdfData], {type:'application/pdf'});

and make sure your base64 string doesn’t start with data:.. nor base64,...