https://github.com/oezeb/cpp-json

Simple JSON parser in C++
https://github.com/oezeb/cpp-json

Last synced: 9 days ago
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Simple JSON parser in C++

• Host: GitHub
• URL: https://github.com/oezeb/cpp-json
• Owner: oezeb
• Created: 2022-08-02T13:58:27.000Z (over 2 years ago)
• Default Branch: main
• Last Pushed: 2022-08-02T14:04:34.000Z (over 2 years ago)
• Last Synced: 2024-11-06T12:11:41.610Z (about 2 months ago)
• Language: C++
• Size: 6.84 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# cpp-json

cpp json is a simple and lightweight JSON parser and generator for C++. 

## JSON Elements

We define several classes to represent JSON data. All JSON data inherits from an abstract class `json::element`.

| JSON data          | C++ type                                          |

| ------------------ | ------------------------------------------------- |

| json::object       | std::unordered_map\ |

| json::array        | std::vector\                     |

| json::string       | std::string                                       |

| json::number       | double                                            |

| json::boolean      | bool                                              |

| json::null         | nullptr                                           |

`json::element` has a method `get_value` that uses generics to return an equivalent C++ type of the JSON data.

```c++

    json::boolean b(true);

    b.get_value() // true

```

## JSON Gen

i.e To generate the following User JSON data:

```json

    {

        "name": "Jayden Carr",

        "age": 24,

        "single": true,

        "phones": [

            "(945)-441-6267",

            "(945)-441-5532"

        ],

        "location": {

            "state": "Hawaii",

            "country": "United States",

            "city": "Carlsbad",

            "street": {

                "name": "Forest Ln",

                "number": 1810

            }

        }

    }

```

We can use the following code:

```c++

    // Create a User object

    auto user = new json::object();

    user->set("name", "Jayden Carr");

    user->set("age", 24);

    user->set("single", true);

        // create an array of phones

        auto phones = new json::array();

        phones->add("(945)-441-6267");

        phones->add("(945)-441-5532");

    user->set("phones", phones);

        // create a location object

        auto location = new json::object();

        location->set("state", "Hawaii");

        location->set("country", "United States");

        location->set("city", "Carlsbad");

            // create a street object

            auto street = new json::object();

            street->set("name", "Forest Ln");

            street->set("number", 1810);

        location->set("street", street);

    user->set("location", location);

```

## JSON Stringify

`json::element` contains a method `to_string` that can be used to get a JSON string representation of any JSON data.

```c++

string s = user->to_string();

```

## JSON Parse

To parse a given JSON string, we can use the `json::parse` function.

```c++

    auto e = json::parse(s); 

    // e is a json::element*

    // Considering the above example, it can be casted to a json::object*

    auto user = (json::object*)e;

```

## Testing

Compile and run `test.cpp`

    g++ test.cpp json.hpp json.cpp -o test

	./test