我得到错误期望值:第1行第1列(字符0)时试图解码JSON。

我用于API调用的URL在浏览器中工作正常,但在通过curl请求完成时给出了这个错误。下面是我用于curl请求的代码。

错误发生在返回simplejson.loads(response_json)时

response_json = self.web_fetch(url)
response_json = response_json.decode('utf-8')
return json.loads(response_json)


def web_fetch(self, url):
    buffer = StringIO()
    curl = pycurl.Curl()
    curl.setopt(curl.URL, url)
    curl.setopt(curl.TIMEOUT, self.timeout)
    curl.setopt(curl.WRITEFUNCTION, buffer.write)
    curl.perform()
    curl.close()
    response = buffer.getvalue().strip()
    return response

回溯:

File "/Users/nab/Desktop/myenv2/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  111.                         response = callback(request, *callback_args, **callback_kwargs)
File "/Users/nab/Desktop/pricestore/pricemodels/views.py" in view_category
  620.     apicall=api.API().search_parts(category_id= str(categoryofpart.api_id), manufacturer = manufacturer, filter = filters, start=(catpage-1)*20, limit=20, sort_by='[["mpn","asc"]]')
File "/Users/nab/Desktop/pricestore/pricemodels/api.py" in search_parts
  176.         return simplejson.loads(response_json)
File "/Users/nab/Desktop/myenv2/lib/python2.7/site-packages/simplejson/__init__.py" in loads
  455.         return _default_decoder.decode(s)
File "/Users/nab/Desktop/myenv2/lib/python2.7/site-packages/simplejson/decoder.py" in decode
  374.         obj, end = self.raw_decode(s)
File "/Users/nab/Desktop/myenv2/lib/python2.7/site-packages/simplejson/decoder.py" in raw_decode
  393.         return self.scan_once(s, idx=_w(s, idx).end())

Exception Type: JSONDecodeError at /pricemodels/2/dir/
Exception Value: Expecting value: line 1 column 1 (char 0)

当前回答

我遇到了同样的问题,当打印出从json文件中打开的json字符串时,发现json字符串以''开头,通过做一些研究,这是因为文件默认是用UTF-8解码的,通过将编码改为UTF-8 -sig,标记被剥离,加载json没有问题:

open('test.json', encoding='utf-8-sig')

其他回答

在我的情况下,它发生了,因为我读取文件的数据使用file.read(),然后尝试使用json.load(文件)解析它。我通过将json.load(file)替换为json.loads(data)来解决这个问题。

不能工作的代码

with open("text.json") as file:
    data=file.read()
    json_dict=json.load(file)

工作代码

with open("text.json") as file:
   data=file.read()
   json_dict=json.loads(data)

我有同样的问题,试图读取json文件

json.loads("file.json")

我用

with open("file.json", "r") as read_file:
   data = json.load(read_file)

也许这个对你有帮助

检查文件的编码格式,读取文件时使用相应的编码格式。它会解决你的问题。

with open("AB.json", encoding='utf-8', errors='ignore') as json_data:
     data = json.load(json_data, strict=False)

对我来说,这是服务器响应的东西,而不是200,响应不是json格式的。我最终在json解析之前这样做:

# this is the https request for data in json format
response_json = requests.get() 

# only proceed if I have a 200 response which is saved in status_code
if (response_json.status_code == 200):  
     response = response_json.json() #converting from json to dictionary using json library

很多时候,这是因为你试图解析的字符串是空的:

>>> import json
>>> x = json.loads("")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/Cellar/python/3.7.3/Frameworks/Python.framework/Versions/3.7/lib/python3.7/json/__init__.py", line 348, in loads
    return _default_decoder.decode(s)
  File "/usr/local/Cellar/python/3.7.3/Frameworks/Python.framework/Versions/3.7/lib/python3.7/json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/local/Cellar/python/3.7.3/Frameworks/Python.framework/Versions/3.7/lib/python3.7/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 1 (char 0)

你可以通过事先检查json_string是否为空来补救:

import json

if json_string:
    x = json.loads(json_string)
else:
    # Your code/logic here 
    x = {}