Json reader for c++, allows to generate a structure "Json" in c++ from a simple json file.
build with c++ only, using the fstream and regex libraries.

Installation

Download the code from code zip and unzip it.
For this version you need to put the full path when using the JsonReader
so I recommend placing it near or within your project.

Usage

1. Include JsonReader #include"path/to/JsonReader.h"
2. Create a the Json object Json file("path/to/file.json"); // path to json file
3. Get property like file["path"]["to"]["property"] if is array put the number like file["array"][9]["property"]

From the following json file:

{
    "firstName": "Rack",
    "lastName": "Jackon",
    "gender": "man",
    "age": 24,
    "address": {
        "streetAddress": "126",
        "city": "San Jone",
        "state": "CA",
        "postalCode": "394221"
    },
    "phoneNumbers": [
        { "type": "home", "number": "7383627627" },
        { "type": "office", "number": "8462945527" }
    ]
}

The following code must be used:

#include<iostream>
using namespace std;
#include"../src/JsonReader.h" // include this file

int main(int argc, char** argv){
    // build a Object Json
    Json file("file.json"); // path to json file
    // Get properties like -> file["path"]["to"]["property"]
    cout << "The name is " << file["firstName"] << ' ' << file["lastName"] << endl;
    cout << "The city is " << file["address"]["city"] << ", " << file["address"]["state"] << endl;
    cout << "The phone office is " << file["phoneNumbers"][1]["number"] << endl;
}

The result per console is as follows:

Another example iterating over an array:

From the following json file:

{
	"DueDate": "2021-07-18",
	"InvoiceNumber": "83172212392",
	"Status": "Paid out",
	"discount": 0.10,
	"customer" : {
		"id" : "111",
		"name" : "Mike",
		"lastName" : "Anderson"
	},
	"purchaseDetail" : [
		{
			"productId" : "12345",
			"description" : "Low fat milk",
			"amount" : 3,
			"price": 1.45,
			"discount" : true
		}, {
			"productId" : "54321",
			"description" : "Butter",
			"amount" : 2,
			"price" : 1.05,
			"discount" : false
		}, {
			"productId" : "15243",
			"description" : "Flour",
			"amount" : 1,
			"price" : 2.15,
			"discount" : false
		}, {
			"productId" : "52341",
			"description" : "sugar",
			"amount" : 2,
			"price" : 2.0,
			"discount" : true
		}
	]
}

The following code must be used:

#include<iostream>
using std::cout;
using std::endl;

#include"../src/JsonReader.h"

int main(int argc, char** argv){
	Json bill("invoice.json"); 
	cout << "Purchase details" << endl;
	cout << "Due date: " << bill["DueDate"] << endl;
	cout << "Invoice number: " << bill["InvoiceNumber"] << endl;
	cout << "Status: " << bill["Status"] << endl;
	cout << "Costumber: " << bill["customer"]["name"] << ' ' << bill["customer"]["lastName"] << endl;
	double total = 0, subTotalLine;
	double discount = bill["discount"];
	cout << "Discount: " << discount * 100 << "%" << endl;
	cout << "ID\tDescription\t\tAmount\tPrice\t Discount\tTotal" << endl;
	Json purchaseDetail = bill["purchaseDetail"];
	for(size_t i = 0 ; i < purchaseDetail.size(); i++){
		cout << i << ".\t" << purchaseDetail[i]["description"];
		cout.width(12);
		cout << "\t" << purchaseDetail[i]["amount"];
		cout << "\t" << purchaseDetail[i]["price"];
		subTotalLine = (double) purchaseDetail[i]["amount"] * (double) purchaseDetail[i]["price"];
		if(purchaseDetail[i]["discount"]){
			cout << "\t YES";
			subTotalLine -= subTotalLine * discount;
		} else {
			cout << "\t NOT";
		}
		cout.width(10);
		cout << "\t" << subTotalLine << endl;
		total += subTotalLine;
	}
	cout << "Total: " << total << endl;
	cout << "Thanks for your purchase" << endl;
}

The result per console is as follows:

Author

• DavidVillalobos

Contributing

For new changes, please open an issue first to discuss what you would like to change.
You can contact me at 📫 : villalobosgonzalezluisdavid@gmail.com

License

The project is licensed by