json/doc/examples/README.cpp

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#include <iostream>
#include <iomanip> // for std::setw
#include "json.hpp"
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using json = nlohmann::json;
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int main()
{
// create a JSON object
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json j =
{
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{"pi", 3.141},
{"happy", true},
{"name", "Niels"},
{"nothing", nullptr},
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{
"answer", {
{"everything", 42}
}
},
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{"list", {1, 0, 2}},
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{
"object", {
{"currency", "USD"},
{"value", 42.99}
}
}
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};
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// add new values
j["new"]["key"]["value"] = {"another", "list"};
// count elements
auto s = j.size();
j["size"] = s;
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// pretty print with indent of 4 spaces
std::cout << std::setw(4) << j << '\n';
}