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examples/exception.cpp

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+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    try
+    {
+        // calling at() for a non-existing key
+        json j = {{"foo", "bar"}};
+        json k = j.at("non-existing");
+    }
+    catch (json::exception& e)
+    {
+        // output exception information
+        std::cout << "message: " << e.what() << '\n'
+                  << "exception id: " << e.id << std::endl;
+    }
+}