binascii.Error: Invaild base64-encoded string: number of data characters(1957) cannot be 1 more than a multiple of 4

Solution 1:

1. Try padding your input with the correct number (1,2 or 3) of = characters so as to make its final length a multiple of 4. Skip that step if your token length is already a multiple of 4 (len(padded_token)%4 == 0).

2. You might get the same error still if your input is using characters -_ in which case it means it is urlsafe encoded. In that case use base64.urlsafe_b64decode rather than base64.b64decode to decode it.

Solution 2:

I've also got this error because of modifying a session cookie. When I accessed the django server(localhost:8000) via chrome, i got this error but then using incognito mode, it worked.

The solution was to clear my cookies. I hope that helps somebody!