How do I read a Base64 Url encoded string to excel?

I’m getting a xlsx attachment using the Gmail API https://developers.google.com/gmail/api/v1/reference/users/messages/attachments#resource

It returns it as a “The body data of a MIME message part as a base64url encoded string.”

I’m not sure how to read it?

XLSX.read(attachment, {type: 'base64'});

I get

TypeError: f.substr is not a function

How I do read this? Ultimately I want to convert that base64 format from Gmail to a JSON object.

Thanks.

[Mujtaba4ahmed]

I have an XLSX file on the server which I am trying to download. When I hit that url with axios call, I get very diff, random data as response. How do I convert it to normal xlsx data?

data : &��\���ad,��J������]bl��sM�E@�&ŵ�ͧ 0�� b�TC%̔Jba���4���8’��8oA��YRi ڨV�ߌ�,1/hK8�� K6�+�,�!��D���p�k�%���:v ��h’�T�)�!���c�O�j|�G�Q{����U�pb�n’(��!�R-W0@����W��0��u�I��;�YᲨ�ok>N0YЎ)����=�� Ç��W��/X�\�ZtZ�O�,ᴴ�YU��U����U���JI�]���’�M�b[��� i�Od

Data from response looks like this.

[louckousse]

I had this problem and what I did was:

const buf = Buffer.from(attachment, 'base64')
const sheet = xlsx.read(buf, { type: 'buffer' })

I get the same result that with the replace but I find it cleaner for reading.