I need to decode a base64 string into PDF file. Im using this code. But the window.atob command always report that error: Failed to execute 'atob' on 'Window': The string to be decoded is not correctly encoded.

I know that the file is correct, because I already decoded it using a website that decode base64 to pdf.
I dont know if it helps but we are using Aurelia Framework.

Function that convert

function converBase64toBlob(content, contentType) {

        contentType = contentType || '';

        var sliceSize = 512;

        var byteCharacters = window.atob(content); //method which converts base64 to binary

        var byteArrays = [

        ];

        for (var offset = 0; offset < byteCharacters.length; offset += sliceSize) {

            var slice = byteCharacters.slice(offset, offset + sliceSize);

            var byteNumbers = new Array(slice.length);

            for (var i = 0; i < slice.length; i++) {

                byteNumbers[i] = slice.charCodeAt(i);

            }

            var byteArray = new Uint8Array(byteNumbers);

            byteArrays.push(byteArray);

        }

        var blob = new Blob(byteArrays, {

            type: contentType

        }); //statement which creates the blob

        return blob;

    }

Call of the function

self.blob = self.converBase64toBlob(result.contents[0].pdf.replace(/^[^,]+,/, ''), 'application/pdf');

                self.blobURL = URL.createObjectURL(blob);

                window.open(this.blobURL);