Parsing string to json doesn't work when others types does

[pbustosn]

Has stated.

This work perfectly:
std::string myInteger = "45";
json jInteger= json::parse(myInteger );
if(jInteger.is_number()){ std::cout << "¿Is it number?: Yes = " << jInteger<< std::endl;}

Output: ¿Is it number?: Yes = 45

But this wont work:
std::string myString = "myNewString";
json jString= json::parse(myString );
if(jString.is_string()){ std::cout << "¿Is it string?: Yes = " << jString<< std::endl;}

Output:
terminate called after throwing an instance of 'nlohmann::json_abi_v3_11_3::detail::parse_error'
what(): [json.exception.parse_error.101] parse error at line 1, column 1: syntax error while parsing value - invalid literal; last read: 'm'

[nlohmann]

myNewString is not valid JSON, "myNewString" is. In your code, change

std::string myString = "myNewString";

to

std::string myString = "\"myNewString\"";

[pbustosn]

So for all effects the example:

{
    "pi": 3.141,
    "happy": true,
    "name": "Niels",
    "nothing": null,
    "answer": {
        "everything": 42
    },
    "list": [ 1, 0, 2 ],
    "object": {
        "currency": "USD",
        "value": 42.99
    }
}

For Niels to be a valid string, it must be double quoted? And that's for each rest service with strings?

[nlohmann]

No, the JSON value is fine. You only need to add double quotes in C++, because the first quotes are to denote a string literal whereas the second (escaped) quotes are for JSON.