syntax error - invalid string: control character must be escaped; last read: '"ass<U+0000>'; expected string literal

[rahul233343]

Hello,

I am facing this issue as json std::string which i receive from server contains \u0000. while parsing i am getting exception.

terminate called after throwing an instance of 'nlohmann::detail::parse_error'
what(): [json.exception.parse_error.101] parse error at 15429: syntax error - invalid string: control character must be escaped; last read: '"ass<U+0000>'; expected string literal

One strange thing is that, the same query when queried from the other application does not give the parsing error. So i am not sure whether to raise the bug on server side.

Any lead would be appreciated.

[nlohmann]

A JSON string must not contain control characters unless they are escaped with \ or via \uxxxx:

That is, a null byte in a string must be escaped like \u0000. I think your server may be too lax on this - or the null byte is the symptom of a bigger issue.

[rahul233343]

But in other application with same version of json, same query result donot gives exception.

Is by any chance i may inserting this \u0000 to the string?
I am just doing curl and curl is writing result to my std::string variable in c

"{"balances":[{"nam\u0000e":"ABC","free":"0.0000\u00000000","lock":"0.00000000"},{"name":"XYZ","free":"0.00000000","lock":"0.00000000"}],"type":["DEF"]}\u0000"

and if i have to use this result string as it is, what should i have to do?

[nlohmann]

This looks as if there is an issue with the buffer you fill with curl.

[rahul233343]

thanks, its working now