Converting a string to JSON without "/"

[Kolhun]

Hello everyone I'm trying to write the string "vars": {"category":"44"} to json, but for some unknown reason it writes iterators / to the string, the code below attempts to fix this problem (I didn't see any obvious solutions to the problem in the JSON documentation)

json _dataPost;
_dataPost["vars"] = R"({"category":")" + param1 + R"("})";

conclusion

Tell me how to solve this problem...

[Kolhun]

I tried another way, for some reason I wrote down another \n characters

json demo;
demo["vars"] =
{
    {"category", param1.c_str()}
};
std::string ss = demo["vars"].dump(0);
paramStr = ss.c_str();

json _dataPost;
_dataPost["vars"] = paramStr.c_str();

[gregmarr]

json _dataPost;
_dataPost["vars"] = { "category", param1 };

https://www.godbolt.org/z/1f76rWsej

[Kolhun]

json _dataPost;
_dataPost["vars"] = { "category", param1 };

https://www.godbolt.org/z/1f76rWsej

Need "vars": {"category":"124325"},