python解码javascript btoa字符串

Question

我在javascript中使用这个代码来编码一个json

a = {'address': "djdjdjdj", "provider": "google"}
{address: 'djdjdjdj', provider: 'google'}
btoa(a)
'W29iamVjdCBPYmplY3Rd'

我使用这个代码解码后端

import json
import base64
encodes_Str = "W29iamVjdCBPYmplY3Rd"
btoa = lambda x:base64.b64decode(x)
atob = lambda x:base64.b64encode(bytes(x, 'utf-8')).decode('utf-8')
decoded = json.loads(btoa(encodes_Str))
print(decoded)

错误:

>>> decoded = json.loads(btoa("W29iamVjdCBPYmplY3Rd"))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/json/__init__.py", line 357, in loads
return _default_decoder.decode(s)
File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/json/decoder.py", line 337, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/json/decoder.py", line 355, in raw_decode
raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 2 (char 1)
>>> 

我得到以上的错误。我怎么能得到我在javascript编码的json请看

Answer 1

您的问题是，在尝试base64编码之前，您没有将JavaScript对象转换为字符串。因此，当你在python中解码它时，你会得到字符串:

[object Object]

在JavaScript中，您需要首先对对象进行JSON编码，即

a = {'address': "djdjdjdj", "provider": "google"}
btoa(JSON.stringify(a))

这将给出字符串:

"eyJhZGRyZXNzIjoiZGpkamRqZGoiLCJwcm92aWRlciI6Imdvb2dsZSJ9"

，然后可以运行

json.loads(base64.b64decode(encodes_Str))

:

{'address': 'djdjdjdj', 'provider': 'google'}