blocks|key|376848|text|您将无法让python告诉您JSON在哪里不正确。你需要在像this这样的地方使用linter|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|376849|这将显示您正在尝试解码的JSON中的错误。|376850|entityMap|0|LINK|mutability|MUTABLE|url|http://jsonformatter.curiousconcept.com/^0|U|4|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

You wont be able to get python to tell you where the JSON is incorrect. You will need to use a linter online somewhere like <a href="http://jsonformatter.curiousconcept.com/">this</a>

This will show you error in the JSON you are trying to decode.

blocks|key|158990|text|我发现，在内置json模块不明确的许多情况下，simplejson模块会提供更多描述性错误。例如，对于列表中最后一项后有逗号的情况：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|158991|json.loads('[1,2,]')
....
ValueError:+No+JSON+object+could+be+decoded|code-block|syntax|javascript|158992|这不是很有描述性。对simplejson执行相同的操作|158993|simplejson.loads('[1,2,]')
...
simplejson.decoder.JSONDecodeError:+Expecting+object:+line+1+column+5+(char+5)|158994|好多了！对于其他常见错误，如大写True，也是如此。|158995|entityMap^0|7|4|N|A|0|0|A|A|0|0|G|4|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|12|8|@$9|13|A|14|B|C]]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|R|$]]

I've found that the <code>simplejson</code> module gives more descriptive errors in many cases where the built-in <code>json</code> module is vague. For instance, for the case of having a comma after the last item in a list:

<pre><code>json.loads('[1,2,]')
....
ValueError: No JSON object could be decoded
</code></pre>

which is not very descriptive. The same operation with <code>simplejson</code>:

<pre><code>simplejson.loads('[1,2,]')
...
simplejson.decoder.JSONDecodeError: Expecting object: line 1 column 5 (char 5)
</code></pre>

Much better! Likewise for other common errors like capitalizing <code>True</code>.

blocks|key|159051|text|您可以使用cjson，它声称比纯python实现快250倍，因为您有“一些又长又复杂的JSON文件”，并且您可能需要多次运行它(解码器失败，并且只报告遇到的第一个错误)。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|159052|entityMap|0|LINK|mutability|MUTABLE|url|https://pypi.python.org/pypi/python-cjson^0|5|5|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

You could use <a href="https://pypi.python.org/pypi/python-cjson" rel="nofollow">cjson</a>, that claims to be up to 250 times faster than pure-python implementations, given that you have "some long complicated JSON file" and you will probably need to run it several times (decoders fail and report the first error they encounter only).

blocks|key|159113|text|对于这个问题的特定版本，我继续搜索packaging.py文件中的load_json_file(path)函数声明，然后在其中偷偷添加了一行print代码：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|159114|def+load_json_file(path):
++++data+=+open(path,+'r').read()
++++print+data
++++try:
++++++++return+Bunch(json.loads(data))
++++except+ValueError,+e:
++++++++raise+MalformedJsonFileError('%25s+when+reading+"%25s"'+%25+(str(e),
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++path))|code-block|syntax|javascript|159115|这样，它就会在输入try-catch之前打印json文件的内容，而且通过这种方式-即使我的Python知识还不够丰富-我也能够很快弄清楚为什么我的配置不能读取json文件。|159116|(这是因为我设置了文本编辑器来编写UTF-8BOM…愚蠢)|159117|之所以提到这一点，是因为虽然这可能不是OP特定问题的一个很好的答案，但这是确定一个非常令人压抑的bug的来源的一个相当快速的方法。我敢打赌，许多正在寻找更冗长的MalformedJsonFileError:+No+JSON+object+could+be+decoded+when+reading+…解决方案的人都会偶然读到这篇文章。所以这可能会对他们有所帮助。|159118|entityMap^0|H|C|X|K|1Y|5|0|0|0|0|28|1Y|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|10|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|11|8|@]|D|@]|E|$]]|$1|O|3|P|5|6|7|12|8|@$9|13|A|14|B|C]]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|R|$]]

For my particular version of this problem, I went ahead and searched the function declaration of <code>load_json_file(path)</code> within the <code>packaging.py</code> file, then smuggled a <code>print</code> line into it:

<pre><code>def load_json_file(path):
 data = open(path, 'r').read()
 print data
 try:
 return Bunch(json.loads(data))
 except ValueError, e:
 raise MalformedJsonFileError('%s when reading "%s"' % (str(e),
 path))
</code></pre>

That way it would print the content of the json file before entering the try-catch, and that way – even with my barely existing Python knowledge – I was able to quickly figure out why my configuration couldn't read the json file. 
(It was because I had set up my text editor to write a UTF-8 BOM … stupid)

Just mentioning this because, while maybe not a good answer to the OP's specific problem, this was a rather quick method in determining the source of a very oppressing bug. And I bet that many people will stumble upon this article who are searching a more verbose solution for a <code>MalformedJsonFileError: No JSON object could be decoded when reading …</code>. So that might help them.

blocks|key|159156|text|我也遇到了类似的问题，这是我的代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|159157|++++json_file=json.dumps(pyJson)
++++file+=+open("list.json",'w')
++++file.write(json_file)++

++++json_file+=+open("list.json","r")
++++json_decoded+=+json.load(json_file)
++++print+json_decoded|code-block|syntax|javascript|159158|问题是我忘记了file.close()，我做了，并解决了这个问题。|offset|length|style|CODE|159159|entityMap^0|0|0|7|C|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I had a similar problem this was my code:

<pre><code> json_file=json.dumps(pyJson)
 file = open("list.json",'w')
 file.write(json_file) 

 json_file = open("list.json","r")
 json_decoded = json.load(json_file)
 print json_decoded
</code></pre>

the problem was i had forgotten to <code>file.close()</code> I did it and fixed the problem.

blocks|key|159189|text|对我来说，我的json文件非常大，在python中使用普通的json时会得到上面的错误。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|159190|通过sudo+pip+install+simplejson安装simplejson之后。|159191|然后我解决了这个问题。|159192|import+json
import+simplejson


def+test_parse_json():
++++f_path+=+'/home/hello/_data.json'
++++with+open(f_path)+as+f:
++++++++#+j_data+=+json.load(f)++++++#+ValueError:+No+JSON+object+could+be+decoded
++++++++j_data+=+simplejson.load(f)++#+right
++++lst_img+=+j_data['images']['image']
++++print+lst_img[0]


if+__name__+==+'__main__':
++++test_parse_json()|code-block|syntax|javascript|159193|entityMap^0|U|4|0|2|R|V|A|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@$9|U|A|V|B|C]|$9|W|A|X|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|Y|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|Z|8|@]|D|@]|E|$M|N]]|$1|O|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|P|$]]

As to me, my json file is very large, when use common <code>json</code> in python it gets the above error.

After install <code>simplejson</code> by <code>sudo pip install simplejson</code>.

And then I solved it.

<pre><code>import json
import simplejson


def test_parse_json():
 f_path = '/home/hello/_data.json'
 with open(f_path) as f:
 # j_data = json.load(f) # ValueError: No JSON object could be decoded
 j_data = simplejson.load(f) # right
 lst_img = j_data['images']['image']
 print lst_img[0]


if __name__ == '__main__':
 test_parse_json()
</code></pre>

blocks|key|377087|text|当您的文件创建时。而不是创建一个内容为空的文件。替换为：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|377088|json.dump({},+file)|code-block|syntax|javascript|377089|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

When your file is created. Instead of creating a file with content is empty. Replace with:

<pre><code>json.dump({}, file)
</code></pre>

Python code to load data from some long complicated JSON file:

<pre><code>with open(filename, "r") as f:
 data = json.loads(f.read())
</code></pre>

(note: the best code version should be:

<pre><code>with open(filename, "r") as f:
 data = json.load(f)
</code></pre>

but both exhibit similar behavior)

For many types of JSON error (missing delimiters, incorrect backslashes in strings, etc), this prints a nice helpful message containing the line and column number where the JSON error was found.

However, for other types of JSON error (including the classic "using comma on the last item in a list", but also other things like capitalising true/false), Python's output is just:

<pre><code>Traceback (most recent call last):
 File "myfile.py", line 8, in myfunction
 config = json.loads(f.read())
 File "c:\python27\lib\json\__init__.py", line 326, in loads
 return _default_decoder.decode(s)
 File "c:\python27\lib\json\decoder.py", line 360, in decode
 obj, end = self.raw_decode(s, idx=_w(s, 0).end())
 File "c:\python27\lib\json\decoder.py", line 378, in raw_decode
 raise ValueError("No JSON object could be decoded")
ValueError: No JSON object could be decoded
</code></pre>

For that type of ValueError, how do you get Python to tell you where is the error in the JSON file?

Displaying better error message than "No JSON object could be decoded"

Python

JSON

从某个长而复杂的JSON文件加载数据的Python代码：with open(filename, "r") as f:  data = json.loads(f.read())(注意:最好的代码版本应该是：with open(filename, "r") as f:  data = json.load(f)但两者都表现出...

问显示比"No JSON object than be decoded“更好的错误信息
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