json/doc/examples/parse__allow_exceptions.cpp

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#include <iostream>
#include <nlohmann/json.hpp>
using json = nlohmann::json;
int main()
{
// an invalid JSON text
std::string text = R"(
{
"key": "value without closing quotes
}
)";
// parse with exceptions
try
{
json j = json::parse(text);
}
catch (json::parse_error& e)
{
std::cout << e.what() << std::endl;
}
// parse without exceptions
json j = json::parse(text, nullptr, false);
if (j.is_discarded())
{
std::cout << "the input is invalid JSON" << std::endl;
}
else
{
std::cout << "the input is valid JSON: " << j << std::endl;
}
}