JSONDecodeError:期望值:第1行第1列(char 0)

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

我也遇到过同样的问题，我是这样解决的:

import json

with open("migrate.json", "rb") as read_file:
   data = json.load(read_file)

2021-05-02 09:50:29

其他回答

在请求库中，当你遇到404这样的http错误代码并试图将响应解析为JSON时，JSONDecodeError就会发生!

您必须首先检查200 (OK)或让它在错误时抛出以避免这种情况。我希望它失败时没有那么神秘的错误信息。

注意:正如Martijn Pieters在评论中所说，服务器可以在出现错误时使用JSON进行响应(这取决于实现)，因此检查Content-Type报头更可靠。

2017-05-29 12:14:23

我在请求(python库)方面也遇到了同样的问题。它恰好是接受编码头。

它是这样设置的:'accept-encoding': 'gzip, deflate, br'

我只是从请求中删除它，并停止得到错误。

2018-11-19 10:08:16

只需检查请求的状态码是否为200。例如:

if status != 200:
    print("An error has occured. [Status code", status, "]")
else:
    data = response.json() #Only convert to Json when status is OK.
    if not data["elements"]:
        print("Empty JSON")
    else:
        "You can extract data here"

2020-05-29 13:36:54

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 = {}

2019-05-06 20:58:48

我也遇到过同样的问题，我是这样解决的:

import json

with open("migrate.json", "rb") as read_file:
   data = json.load(read_file)

2021-05-02 09:50:29

JSONDecodeError:期望值:第1行第1列(char 0)

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