How to access JSON nested value in C++ using Boost.JSON
#include <boost/json.hpp>
boost::json::value j = /* ... */;
// Access nested value with key "value"
j.at("value").as_string();
Full example:
#include <boost/json.hpp>
#include <iostream>
int main() {
// Hardcoded JSON string
const std::string json_str = R"(
{
"key": "1234",
"value": "Hello, world!"
}
)";
// Parse the JSON string
boost::json::value j = boost::json::parse(json_str);
// Access the "value" property and print it to stdout
std::string value = j.at("value").as_string().c_str();
std::cout << value << std::endl; // Prints "Hello, world!"
return 0;
}
Compile using
g++ -o json json.cpp -lboost_json
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