JSON Parser in C++

JSON parser in C++

In this post, we will see about JSON parser in C++.

There is no native support for JSON in C++. We can use a number of libraries that provide support for JSON in C++. We will use JsonCpp to parse JSON files in C++ which is very popular. It is an open source library and is widely used for parsing JSON files in C++. There are no limitations for using this library. It allows reading and updating the JSON values. It can be used for serialization and deserialization from strings and to strings.

JavaScript Object Notation(JSON) is a format for storing and exchanging the data. It is used to represent data of different types like integer, real number, string, an ordered sequence of values and a collection of name /value pairs.
JSON Data example:

Simple JSON Parser in C++ using JsonCpp library

We will include the necessary header files to define the interface to JsonCpp. We can use Json::Reader and Json::Writer for reading and writing in JSON files. Json::reader will read the JSON file and will return the value as Json::Value. Parsing the JSON is very simple by using parse().
fstream() is used to get the file pointer in the variable file. parse() is used to get the data. Errors can be checked at the time of parsing. Data can be modified with the help of JsonCpp. In the end, we will make the changes in the original file. Output can also be stored in a new file.

item.json

{
“Category” : “Programming”,
“Date” : “1 January 2021”,
“Name” : “Java2Blog”
}

Output items.json file

{
“Category” : “Technical”,
“Date” : “1 January 2021”,
“Name” : “Java2Blog”,
“first” : “Shishank”,
“last” : “Jain”
}

Conclusion

JsonCpp is a powerful and extensively used library to deal with JSON objects in C++. It supports multiple built-in functions which can help in parsing JSON data faster and we can get more properties of the JSON data. In this article, we explained how to parse JSON data in C++.

That’s all about JSON parser in C++.
Happy Learning!!

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