Accessing JSON values in C++ - c++

Question

I am trying to write a program that navigates your local disc in Unreal Engine for a small application. I have put together a REST server using Gradle, and long story short, I am given a JSON with a machines directories. I want to pull out the specific directories names, to be returned as string (FText specifically, but that not too important here) array.
I found a library created by nLohmann on github (https://github.com/nlohmann/json) which seems to be the best way to handle a JSON in c++. For the life of me, however, I can't figure out how to pull the directory names out. I've tried an iterator and a straightforward .value() call.
The code and a JSON example are below, any insight would be greatly appreciated.
char buffer[1024];
FILE *lsofFile_p = _popen("py C:\\Users\\jinx5\\CWorkspace\\sysCalls\\PullRoots.py", "r");
fgets(buffer, sizeof(buffer), lsofFile_p);
_pclose(lsofFile_p);
std::string rootsJson(buffer);
string s = rootsJson.substr(1);
s = ReplaceAll(s, "'", "");
//here my string s will contain: [{"description":"Local Disk","name":"C:\\"},{"description":"Local Disk","name":"D:\\"},{"description":"CD Drive","name":"E:\\"}]
//These are two syntax examples I found un nlohmann's docs, neither seems to work
auto j = json::parse(s);
string descr = j.value("description", "err");

Answer 1

I think your problem comes from number of \ in your literal string. You need 5 \ for C:\\ : C:\\\\\.
Here is a working example :
#include "json.hpp"
#include <string>
using namespace std;
using json = nlohmann::json;
int main(){
json j = json::parse("[{\"description\":\"Local Disk\",\"name\":\"C:\\\\\"},{\"description\":\"Local Disk\",\"name\":\"D:\\\\\"},{\"description\":\"CD Drive\",\"name\":\"E:\\\\\"}]");
cout << j.is_array() << endl;
for (auto& element : j) {
std::cout << "description : " << element["description"] << " | " << " name : " << element["name"] << '\n';
}
return 0;
}