I have a variable that stores json value. I want to base64 encode it in Python. But the error 'does not support the buffer interface' is thrown. I know that the base64 needs a byte to convert. But as I am newbee in Python, no idea as how to convert json to base64 encoded string.Is there a straight forward way to do it??
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5 Answers
In Python 3.x you need to convert your str object to a bytes object for base64 to be able to encode them. You can do that using the str.encode method:
>>> import json
>>> import base64
>>> d = {"alg": "ES256"}
>>> s = json.dumps(d) # Turns your json dict into a str
>>> print(s)
{"alg": "ES256"}
>>> type(s)
<class 'str'>
>>> base64.b64encode(s)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python3.2/base64.py", line 56, in b64encode
raise TypeError("expected bytes, not %s" % s.__class__.__name__)
TypeError: expected bytes, not str
>>> base64.b64encode(s.encode('utf-8'))
b'eyJhbGciOiAiRVMyNTYifQ=='
If you pass the output of your_str_object.encode('utf-8') to the base64 module, you should be able to encode it fine.
4 Comments
AshKsh
My apologies if my question is ambiguous. actually I am trying to construct a JWS and encode it in Base64. So my variable is like this, header = {"alg": "ES256"}. What I am try to do is base64.b64encode(header).
David Sánchez
the only solution I found it work to transform an already string but encoded in base64 to plain text string. Thanks!
greg
Have to
import base64 first
dano
@greg Thanks, fixed.
You could encode the string first, as UTF-8 for example, then base64 encode it:
data = '{"hello": "world"}'
enc = data.encode() # utf-8 by default
print base64.encodestring(enc)
This also works in 2.7 :)
Comments
Here are two methods worked on python3 encodestring is deprecated and suggested one to use is encodebytes
import json
import base64
with open('test.json') as jsonfile:
data = json.load(jsonfile)
print(type(data)) #dict
datastr = json.dumps(data)
print(type(datastr)) #str
print(datastr)
encoded = base64.b64encode(datastr.encode('utf-8')) #1 way
print(encoded)
print(base64.encodebytes(datastr.encode())) #2 method
Comments
Here's a function that you can feed a string and it will output a base64 string.
import base64
def b64EncodeString(msg):
msg_bytes = msg.encode('ascii')
base64_bytes = base64.b64encode(msg_bytes)
return base64_bytes.decode('ascii')
Comments
Quickest way:
import base64, json
print(base64.b64encode(open("key.json","rb").read()).decode())
Just don't call your file base64.py, I just had that problem, then your base64.py overshadows the lib base64 and you'll get:
AttributeError: partially initialized module 'base64' has no attribute 'b64encode' (most likely due to a circular import)
