Creating json string using json lib - c++

Question

I am using jsonc-libjson to create a json string like below.
{ "author-details": {
"name" : "Joys of Programming",
"Number of Posts" : 10
}
}
My code looks like below
json_object *jobj = json_object_new_object();
json_object *jStr1 = json_object_new_string("Joys of Programming");
json_object *jstr2 = json_object_new_int("10");
json_object_object_add(jobj,"name", jStr1 );
json_object_object_add(jobj,"Number of Posts", jstr2 );
this gives me json string
{
"name" : "Joys of Programming",
"Number of Posts" : 10
}
How do I add the top part associated with author details?

Answer 1

To paraphrase an old advertisement, "libjson users would rather fight than switch."
At least I assume you must like fighting with the library. Using nlohmann's JSON library, you could use code like this:
nlohmann::json j {
{ "author-details", {
{ "name", "Joys of Programming" },
{ "Number of Posts", 10 }
}
}
};
At least to me, this seems somewhat simpler and more readable.
Parsing is about equally straightforward. For example, let's assume we had a file named somefile.json that contained the JSON data shown above. To read and parse it, we could do something like this:
nlohmann::json j;
std::ifstream in("somefile.json");
in >> j; // Read the file and parse it into a json object
// Let's start by retrieving and printing the name.
std::cout << j["author-details"]["name"];
Or, let's assume we found a post, so we want to increment the count of posts. This is one place that things get...less tasteful--we can't increment the value as directly as we'd like; we have to obtain the value, add one, then assign the result (like we would in lesser languages that lack ++):
j["author-details"]["Number of Posts"] = j["author-details"]["Number of Posts"] + 1;
Then we want to write out the result. If we want it "dense" (e.g., we're going to transmit it over a network for some other machine to read it) we can just use <<:
somestream << j;
On the other hand, we might want to pretty-print it so a person can read it more easily. The library respects the width we set with setw, so to have it print out indented with 4-column tab stops, we can do:
somestream << std::setw(4) << j;

Answer 2

Create a new JSON object and add the one you already created as a child.
Just insert code like this after what you've already written:
json_object* root = json_object_new_object();
json_object_object_add(root, "author-details", jobj); // This is the same "jobj" as original code snippet.

Answer 3

Based on the comment from Dominic, I was able to figure out the correct answer.
json_object *jobj = json_object_new_object();
json_object* root = json_object_new_object();
json_object_object_add(jobj, "author-details", root);
json_object *jStr1 = json_object_new_string("Joys of Programming");
json_object *jstr2 = json_object_new_int(10);
json_object_object_add(root,"name", jStr1 );
json_object_object_add(root,"Number of Posts", jstr2 );