JSON (JavaScript Object Notation) is a lightweight data interchange format that is easy for humans to read and write, and easy for machines to parse and generate.

It is often used for transmitting data between a server and a web application, as an alternative to XML.

Here is an example of a JSON object:

1{
2  "name": "John Doe",
3  "age": 30,
4  "city": "New York"
5}

In the example above, the JSON object has three key-value pairs. The keys are strings and the values can be strings, numbers, booleans, arrays, or other nested objects.

To parse and manipulate JSON data in C++, you can use a library like nlohmann/json. This library provides an easy-to-use API for working with JSON objects.

Here is an example of how to create and manipulate a JSON object using the nlohmann/json library in C++:

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}

#include <iostream>

#include <nlohmann/json.hpp>

​

using namespace std;

​

int main()

{

    // Create a JSON object

    nlohmann::json data;

​

    // Add key-value pairs to the JSON object

    data["name"] = "John Doe";

    data["age"] = 30;

    data["city"] = "New York";

​

    // Convert the JSON object to string

    string jsonString = data.dump();

​

    // Print the JSON string

    cout << "JSON String: " << jsonString << endl;

​

    // Parse the JSON string

    nlohmann::json parsedData = nlohmann::json::parse(jsonString);

​

    // Access values from the parsed JSON

    string name = parsedData["name"];

    int age = parsedData["age"];

    string city = parsedData["city"];

​