Trying to parse JSON in Python. ValueError: Expecting property name [duplicate]

Answer 1

That's definitely not JSON - not as printed above anyhow. It's already been parsed into a Python object - JSON would have false, not False, and wouldn't show strings as u for unicode (all JSON strings are unicode). Are you sure you're not getting your json string turned into a Python object for free somewhere in the chain already, and thus loading it into json.loads() is obviously wrong because in fact it's not a string?

Answer 2

I got this error when I had a hanging comma at the end of a list of properties. Because of the comma it was expecting another property name but there was none.

Answer 3

Make sure that your JSON file does not have lines start with // (which wrongfully supposed to comments!). I have the same ValueError message and it's gone after I removed the // from my file.

Answer 4

Sometimes you can have this error because your string values are not well recognized by python. As an example: I've spent quite a lot of time searching for the origin of this kind of error. Here is what I found.

Sometimes a language recognizes a kind of quotes and not another one: btw, to parse a string in to json in JavaScript all quotes have to be in the ' format

to parse a string into json in JavaScript all quotes have to be in the " format which is not really logic.

Hopefully you can use the replace function. For Python:

json.loads(s.replace("\'", '"'));

Hope it will save you the time I've spent hunting this bug!