Develop Reference

How can I accurately return nested values from JSON for comparison and then complete the comparison?

I have asked a similar question before but I've not been able to expand on this and I haven't found the exact answer that would teach me how to do this. My JSON file will have the same structure in terms of the element names inside each nested object but the values will vary. In plain English, I want to start at the bottom of the file and return true if the following conditions occur and stop searching if true: AppStatus is one of these ["Approved", "Auto Approved", "Return"] and the nested keys of "Name": "Payments", "Value": "X" and "Name": "Term", "Value": "Y" have values that don't match. I'm providing a snippet of the JSON so you can see more easily. The AppStatus is 2nd level and the Name, Value are 3rd level. In this example, it should return true based on the 2nd set of data in DataElements.
{
"DecisionHistory": [
{
"Id": "273601",
"Number": "1",
"CreateDate": "2022-10-13 15:31:18.683",
"AppStatus": "Approved",
"DataElements": [
{
"Id": "213922",
"Name": "Payments",
"Value": "72",
"GroupId": "12",
"CustomLabel": null
},
{
"Id": "990",
"Name": "Decisioned By",
"Value": "ASDF",
"GroupId": "3",
"CustomLabel": null
},
{
"Id": "215337",
"Name": "Term",
"Value": "75",
"GroupId": "13",
"CustomLabel": null
}
]
},
{
"Id": "273601",
"Number": "2",
"CreateDate": "2022-10-13 15:31:18.683",
"AppStatus": "Approved",
"DataElements": [
{
"Id": "213922",
"Name": "Payments",
"Value": "72",
"GroupId": "12",
"CustomLabel": null
},
{
"Id": "990",
"Name": "Decisioned By",
"Value": "ASDF",
"GroupId": "3",
"CustomLabel": null
},
{
"Id": "215337",
"Name": "Term",
"Value": "75",
"GroupId": "13",
"CustomLabel": null
}
]
},
{
"Id": "273601",
"Number": "3",
"CreateDate": "2022-10-13 15:31:18.683",
"AppStatus": "Approved",
"DataElements": [
{
"Id": "213922",
"Name": "Payments",
"Value": "75",
"GroupId": "12",
"CustomLabel": null
},
{
"Id": "990",
"Name": "Decisioned By",
"Value": "ASDF",
"GroupId": "3",
"CustomLabel": null
},
{
"Id": "215337",
"Name": "Term",
"Value": "75",
"GroupId": "13",
"CustomLabel": null
}
]
}
]
}
I've tried using 2 ugly nested for loops without success. I would prefer not to use for loops if I don't have to. See below:
function main(jsonFile) {
const history = JSON.parse(jsonFile).DecisionHistory;
const appStatus = ["Approved", "Auto Approved", "Return"];
const termMonths = "TermMonths";
const numberOfPayments = "Number of Payments";
let termMonthsVal = 0;
let numberofPaymentsVal = 0;
for (let a = history.length - 1; a >= 0; a--) {
if (appStatus.includes(history[a].AppStatus)) {
var dataElementsA = history[a].DataElements;
for (let b = (dataElementsA.length) - 1; b >= 0; b--) {
if (dataElementsA[b].Name == termMonths) {
termMonthsVal = new Number((dataElementsA[b].Value));
break;
}
}
}
}
for (let a = history.length - 1; a >= 0; a--) {
if (appStatus.includes(history[a].AppStatus)) {
var dataElementsB = history[a].DataElements;
for (let b = (dataElementsB.length) - 1; b >= 0; b--) {
if (dataElementsB[b].Name == numberOfPayments) {
numberofPaymentsVal = new Number((dataElementsB[b].Value));
break;
}
}
}
}
return (termMonthsVal != numberofPaymentsVal);
}
let jsonFile = `{
"DecisionHistory": [{
"Id": "273601",
"Number": "1",
"CreateDate": "2022-10-13 15:31:18.683",
"AppStatus": "Approved",
"DataElements": [{
"Id": "213922",
"Name": "Payments",
"Value": "72",
"GroupId": "12",
"CustomLabel": null
},
{
"Id": "990",
"Name": "Decisioned By",
"Value": "ASDF",
"GroupId": "3",
"CustomLabel": null
},
{
"Id": "215337",
"Name": "Term",
"Value": "75",
"GroupId": "13",
"CustomLabel": null
}
]
},
{
"Id": "273601",
"Number": "2",
"CreateDate": "2022-10-13 15:31:18.683",
"AppStatus": "Approved",
"DataElements": [{
"Id": "213922",
"Name": "Payments",
"Value": "72",
"GroupId": "12",
"CustomLabel": null
},
{
"Id": "990",
"Name": "Decisioned By",
"Value": "ASDF",
"GroupId": "3",
"CustomLabel": null
},
{
"Id": "215337",
"Name": "Term",
"Value": "75",
"GroupId": "13",
"CustomLabel": null
}
]
},
{
"Id": "273601",
"Number": "3",
"CreateDate": "2022-10-13 15:31:18.683",
"AppStatus": "Approved",
"DataElements": [{
"Id": "213922",
"Name": "Payments",
"Value": "75",
"GroupId": "12",
"CustomLabel": null
},
{
"Id": "990",
"Name": "Decisioned By",
"Value": "ASDF",
"GroupId": "3",
"CustomLabel": null
},
{
"Id": "215337",
"Name": "Term",
"Value": "75",
"GroupId": "13",
"CustomLabel": null
}
]
}
]
}`;
console.log(main(jsonFile));
//var result = main("_inJson");
//module.exports = main;
As a side note, the jsonFile in the main function is read in from a resource folder in my VS Code and I'm exporting main to an app.js so I can run assertions against it. So the JSON posted here is actually in a separate file but this is the exact structure of the data.
What am I missing? .filter? .map? .reduce? Differnt breaks?

Here's a "one-liner" depending on how long you want your lines to be ;)
const x = {
"DecisionHistory": [
{
"AppStatus": "Approved",
"DataElements": [
{
"Name": "Payments",
"Value": "72",
},
{
"Name": "Decisioned By",
"Value": "ASDF",
},
{
"Name": "Term",
"Value": "75",
}
]
},
{
"AppStatus": "Approved",
"DataElements": [
{
"Name": "Payments",
"Value": "72",
},
{
"Name": "Decisioned By",
"Value": "ASDF",
},
{
"Name": "Term",
"Value": "75",
}
]
},
{
"AppStatus": "Approved",
"DataElements": [
{
"Name": "Payments",
"Value": "75",
},
{
"Name": "Decisioned By",
"Value": "ASDF",
},
{
"Name": "Term",
"Value": "75",
}
]
}
]
};
const bar = (f) =>
f.DecisionHistory.reverse().some((decision) => ["Approved", "Auto Approved", "Return"].includes(decision.AppStatus) && decision.DataElements.find((el) => el.Name === 'Payments')?.Value !== decision.DataElements.find((el) => el.Name === 'Term')?.Value);
console.log(bar(x));

Merging two array of objects only when array element contains error

So I have two arrays with objects. And also an array indicating where the replacement should take place(It spots if object contains error)
const oldData = [
{
"index": "01",
"skuId": "Sarbb-033",
"name": "Sasko Black",
"barcode": "843331510012",
"description": "Nice black bread",
"brand": "ERROR: No brand matching: Sasko",
"productLine": "ERROR: No product line matching: line",
"inputType": "Weight",
"uom": "ERROR: Invalid UoM type, valid values are: kg,g,mg,kl,l,ml,m,cm,mm",
"value": "700",
"capacity": "1",
"image": ""
},
{
"index": "02",
"skuId": "ERROR: Empty sku_id is not allowed",
"name": "Sasko Black1",
"barcode": "ERROR: Empty barcode is not allowed",
"description": "Nice black bread",
"brand": "ERROR: No brand matching: Future Life",
"productLine": "ERROR: No product line matching: line",
"inputType": "Weight",
"uom": "kg",
"value": "701",
"capacity": "2",
"image": ""
},
{
"index": "03",
"skuId": "Sarbb-099",
"name": "Sasko Black100",
"barcode": "843332555614",
"description": "Nice black bread",
"brand": "fwfwf",
"productLine": "naam",
"inputType": "weight",
"uom": "g",
"value": "702",
"capacity": "3",
"image": ""
},
{
"index": "04",
"skuId": "Sarbb-100",
"name": "Sasko Black101",
"barcode": "ERROR: Empty barcode is not allowed",
"description": "ERROR: Invalid description: [] it should not be blank.",
"brand": "fwfwf",
"productLine": "fwfwf",
"inputType": "Weight",
"uom": "g",
"value": "703",
"capacity": "4",
"image": ""
},
{
"index": "05",
"skuId": "Sarbb-101",
"name": "Sasko Black102",
"barcode": "843332555616",
"description": "Nice black bread",
"brand": "fwfwf",
"productLine": "naam",
"inputType": "weight",
"uom": "g",
"value": "704",
"capacity": "5",
"image": ""
}
]
const newData = [
{
"index": "01",
"skuId": "Sarbb-033",
"name": "Sasko Black",
"barcode": "843331510012",
"description": "Nice black bread",
"brand": "fwfwf",
"productLine": "fwfwf",
"inputType": "Weight",
"uom": "g",
"value": "700",
"capacity": "1",
"image": ""
},
{
"index": "02",
"skuId": "sarb",
"name": "Sasko Black1",
"barcode": "124125125",
"description": "Nice black bread",
"brand": "fwfwf",
"productLine": "fwfwf",
"inputType": "Weight",
"uom": "kg",
"value": "701",
"capacity": "2",
"image": ""
},
{
"index": "03",
"skuId": "Sarbb-100",
"name": "Sasko Black101",
"barcode": "214214214",
"description": "Desc",
"brand": "fwfwf",
"productLine": "fwfwf",
"inputType": "Weight",
"uom": "g",
"value": "703",
"capacity": "4",
"image": ""
}
]
const errorRows = [0,1,3]
const myTerribleAttempt = oldTableData.map((oldData, rowIndex) => {
return errorRows.map(index => {
if(rowIndex === index){
newTableData.map(newData => {
oldData = newData
})
}
})
})
I have tried multiple maps and just can't seem to get the right result. The new data objects should replace old data objects at the object containing the error. Please give me some assistance.

I think you've overcomplicated this - just check if the index is contained in the error array and choose old or new data.
const result = oldData.map( (item, idx) => errorRows.includes(idx)
? newData[errorRows.findIndex(x => x == idx)]
: item);
live example:
const oldData = [{
"index": "01",
"skuId": "Sarbb-033",
"name": "Sasko Black",
"barcode": "843331510012",
"description": "Nice black bread",
"brand": "ERROR: No brand matching: Sasko",
"productLine": "ERROR: No product line matching: line",
"inputType": "Weight",
"uom": "ERROR: Invalid UoM type, valid values are: kg,g,mg,kl,l,ml,m,cm,mm",
"value": "700",
"capacity": "1",
"image": ""
},
{
"index": "02",
"skuId": "ERROR: Empty sku_id is not allowed",
"name": "Sasko Black1",
"barcode": "ERROR: Empty barcode is not allowed",
"description": "Nice black bread",
"brand": "ERROR: No brand matching: Future Life",
"productLine": "ERROR: No product line matching: line",
"inputType": "Weight",
"uom": "kg",
"value": "701",
"capacity": "2",
"image": ""
},
{
"index": "03",
"skuId": "Sarbb-099",
"name": "Sasko Black100",
"barcode": "843332555614",
"description": "Nice black bread",
"brand": "fwfwf",
"productLine": "naam",
"inputType": "weight",
"uom": "g",
"value": "702",
"capacity": "3",
"image": ""
},
{
"index": "04",
"skuId": "Sarbb-100",
"name": "Sasko Black101",
"barcode": "ERROR: Empty barcode is not allowed",
"description": "ERROR: Invalid description: [] it should not be blank.",
"brand": "fwfwf",
"productLine": "fwfwf",
"inputType": "Weight",
"uom": "g",
"value": "703",
"capacity": "4",
"image": ""
},
{
"index": "05",
"skuId": "Sarbb-101",
"name": "Sasko Black102",
"barcode": "843332555616",
"description": "Nice black bread",
"brand": "fwfwf",
"productLine": "naam",
"inputType": "weight",
"uom": "g",
"value": "704",
"capacity": "5",
"image": ""
}
]
const newData = [{
"index": "01",
"skuId": "Sarbb-033",
"name": "Sasko Black",
"barcode": "843331510012",
"description": "Nice black bread",
"brand": "fwfwf",
"productLine": "fwfwf",
"inputType": "Weight",
"uom": "g",
"value": "700",
"capacity": "1",
"image": ""
},
{
"index": "02",
"skuId": "sarb",
"name": "Sasko Black1",
"barcode": "124125125",
"description": "Nice black bread",
"brand": "fwfwf",
"productLine": "fwfwf",
"inputType": "Weight",
"uom": "kg",
"value": "701",
"capacity": "2",
"image": ""
},
{
"index": "03",
"skuId": "Sarbb-100",
"name": "Sasko Black101",
"barcode": "214214214",
"description": "Desc",
"brand": "fwfwf",
"productLine": "fwfwf",
"inputType": "Weight",
"uom": "g",
"value": "703",
"capacity": "4",
"image": ""
}
]
const errorRows = [0, 1, 3];
const result = oldData.map((item, idx) => errorRows.includes(idx) ? newData[idx] : item);
console.log(result);

Error when I try to parse my json

I am using AngularJs doing a simple application And I want to set a variable up in a javascript file in orther to call a json file.
This is my data.js :
[{
var data = require('data_old.json');
var json = JSON.parse(data);
alert(json["date"]); //01/05/2016
alert(json.date); //01/05/2016
"name": "city A",
"elements": [{
"id": "c01",
"name": "name1",
"price": "15",
"qte": "10"
}, {
"id": "c02",
"name": "name2",
"price": "18",
"qte": "11"
}, {
"id": "c03",
"name": "name3",
"price": "11",
"qte": "14"
}],
"subsities": [{
"name": "sub A1",
"elements": [{
"id": "sub01",
"name": "nameSub1",
"price": "1",
"qte": "14"
}, {
"id": "sub02",
"name": "nameSub2",
"price": "8",
"qte": "13"
}, {
"id": "sub03",
"name": "nameSub3",
"price": "1",
"qte": "14"
}]
}, {
"name": "sub A2",
"elements": [{
"id": "ssub01",
"name": "nameSsub1",
"price": "1",
"qte": "7"
}, {
"id": "ssub02",
"name": "nameSsub2",
"price": "8",
"qte": "1"
}, {
"id": "ssub03",
"name": "nameSsub3",
"price": "4",
"qte": "19"
}]
}, {
"name": "sub A3",
"elements": [{
"id": "sssub01",
"name": "nameSssub1",
"price": "1",
"qte": "11"
}, {
"id": "sssub02",
"name": "nameSssub2",
"price": "2",
"qte": "15"
}, {
"id": "sssub03",
"name": "nameSssub3",
"price": "1",
"qte": "15"
}]
}]
}, {
"name": "city B",
"elements": [{
"id": "cc01",
"name": "name11",
"price": "10",
"qte": "11"
}, {
"id": "cc02",
"name": "name22",
"price": "14",
"qte": "19"
}, {
"id": "cc03",
"name": "name33",
"price": "11",
"qte": "18"
}]
}, {
"name": "city C",
"elements": [{
"id": "ccc01",
"name": "name111",
"price": "19",
"qte": "12"
}, {
"id": "ccc02",
"name": "name222",
"price": "18",
"qte": "17"
}, {
"id": "ccc03",
"name": "name333",
"price": "10",
"qte": "5"
}]
}]
And this is my data.json
[{
"date":"01/05/2016"
}]
I call my data here.
angular.module("myApp",['zingchart-angularjs'])
.controller('MainController', ['$scope', '$http', function($scope, $http) {
$scope.chartBase = {
"type": "line",
"plotarea": {
"adjust-layout": true /* For automatic margin adjustment. */
},
"scale-x": {
"label": {
"text": "Above is an example of a category scale" /* Add a scale title with a label object. */
},
"labels": ["name1", "name2", "name3"] /* Add your scale labels with a labels array. */
},
"series": [{
"values": [15, 18, 11] //here the prices of city selected
},{
"values": [10, 11, 14] //here the qte of city selected
}]
};
$scope.chartData = angular.copy($scope.chartBase);
$http.get('data.js')
.then(function(response) {
$scope.cities = response.data; // save the request data
$scope.selectedCity = $scope.cities[0]; // select the first one
$scope.changeCity(); // update chart
}, function(error) { console.log(error); });
$scope.changeCity = function() {
if($scope.selectedSubCity || $scope.selectedCity){ // if something has been selected
$scope.data = ($scope.selectedSubCity || $scope.selectedCity).elements; // update elements field
// initialize the array to be displayed in chart
var labels = [];
var price = {
"values": []
};
var qte = {
"values": []
};
// fill the arrays to be displayed from the selected city (sub city)
angular.forEach($scope.data, function(item, index) {
labels.push(item.name);
price.values.push(parseInt(item.price));
qte.values.push(parseInt(item.qte));
});
console.log($scope.chartData)
// put selected values to the field that is used to render the chart
$scope.chartData["scale-x"].labels = labels;
$scope.chartData.series = [ price, qte ];
}
}
}]);
When I run this, the browser tell that I have this error :
SyntaxError: Unexpected token v in JSON at position 5
at Object.parse (native)

You can't have those in your data.js file as they are not valid JSON
var data = require('data_old.json');
var json = JSON.parse(data);
alert(json["date"]); //01/05/2016
alert(json.date); //01/05/2016
The error is pointing to the first "v" of "var". You can test your JSON here http://json.parser.online.fr/ on some other online validator.
Your file should look like this:
[{
"name": "city A",
"elements": [{
"id": "c01",
"name": "name1",
"price": "15",
"qte": "10"
}, {
"id": "c02",
"name": "name2",
"price": "18",
"qte": "11"
}, {
"id": "c03",
"name": "name3",
"price": "11",
"qte": "14"
}],
"subsities": [{
"name": "sub A1",
"elements": [{
"id": "sub01",
"name": "nameSub1",
"price": "1",
"qte": "14"
}, {
"id": "sub02",
"name": "nameSub2",
"price": "8",
"qte": "13"
}, {
"id": "sub03",
"name": "nameSub3",
"price": "1",
"qte": "14"
}]
}, {
"name": "sub A2",
"elements": [{
"id": "ssub01",
"name": "nameSsub1",
"price": "1",
"qte": "7"
}, {
"id": "ssub02",
"name": "nameSsub2",
"price": "8",
"qte": "1"
}, {
"id": "ssub03",
"name": "nameSsub3",
"price": "4",
"qte": "19"
}]
}, {
"name": "sub A3",
"elements": [{
"id": "sssub01",
"name": "nameSssub1",
"price": "1",
"qte": "11"
}, {
"id": "sssub02",
"name": "nameSssub2",
"price": "2",
"qte": "15"
}, {
"id": "sssub03",
"name": "nameSssub3",
"price": "1",
"qte": "15"
}]
}]
}, {
"name": "city B",
"elements": [{
"id": "cc01",
"name": "name11",
"price": "10",
"qte": "11"
}, {
"id": "cc02",
"name": "name22",
"price": "14",
"qte": "19"
}, {
"id": "cc03",
"name": "name33",
"price": "11",
"qte": "18"
}]
}, {
"name": "city C",
"elements": [{
"id": "ccc01",
"name": "name111",
"price": "19",
"qte": "12"
}, {
"id": "ccc02",
"name": "name222",
"price": "18",
"qte": "17"
}, {
"id": "ccc03",
"name": "name333",
"price": "10",
"qte": "5"
}]
}]

var data = require('data_old.json');
var json = JSON.parse(data);
alert(json["date"]); //01/05/2016
alert(json.date); //01/05/2016
Why do you add those at the beginning of the JSON ? They cannot be parsed by your script, thus displaying the Syntax Error. What do you want to do exactly ?

validation of my code json

I am developping a simple application in AngularJs in the first time I create a script js but later I need to change it to json file so I need to validate this code json :
[{
"type": "line",
"plotarea": {
"adjust-layout":true /* For automatic margin adjustment. */
},
"scale-x": {
"label":{ /* Add a scale title with a label object. */
"text":"échelle essence gazoile",
},
/* Add your scale labels with a labels array. */
"labels":["sub01","sub02","sub02"]
},
"series": [
{"values":[1,8,1]},//here the prices of city selected
{"values":[14,13,14]}//here the qte of city selected
],
"name": "city A",
"elements": [{
"id": "c01",
"name": "name1",
"price": "15",
"qte": "10"
}, {
"id": "c02",
"name": "name2',
"price": "18,
"qte": "11"
}, {
"id": "c03",
"name": "name3",
"price": "11",
"qte": "14"
}],
"subsities": [{
"name": "sub A1",
"elements": [{
"id": "sub01",
"name": "nameSub1",
"price": "1",
"qte": "14"
}, {
"id": "sub02",
"name": "nameSub2",
"price": "8",
"qte": "13"
}, {
"id": "sub03",
"name": "nameSub3",
"price": "1",
"qte": "14"
}]
}, {
"name": "sub A2",
"elements": [{
"id": "ssub01",
"name": "nameSsub1",
"price": "1",
"qte": "7"
}, {
"id": "ssub02",
"name": "nameSsub2",
"price": "8",
"qte": "1"
}, {
"id": "ssub03",
"name": "nameSsub3",
"price": "4",
"qte": "19"
}]
}, {
"name": "sub A3",
"elements": [{
"id": "sssub01",
"name": "nameSssub1",
"price": "1",
"qte": "11"
}, {
"id": "sssub02",
"name": "nameSssub2",
"price": "2",
"qte": "15"
}, {
"id": "sssub03",
"name": "nameSssub3",
"price": "1",
"qte": "15"
}]
}]
}, {
"name": "city B",
"elements": [{
"id": "cc01",
"name": "name11",
"price": "10",
"qte": "11"
}, {
"id": "cc02",
"name": "name22",
"price": "14",
"qte": "19"
}, {
"id": "cc03",
"name": "name33",
"price": "11",
"qte": "18"
}]
}, {
"name": "city C",
"elements": [{
"id": "ccc01",
"name": "name111",
"price": "19",
"qte": "12"
}, {
"id": "ccc02",
"name": "name222",
"price": "18",
"qte": "17"
}, {
"id": "ccc03",
"name": "name333",
"price": "10",
"qte": "5"
}]
}];
A JSON Validator tells me that my code json is not correct.
Please anybody could help me !

The problem with comments and some of values doesn't contain , and some contains in the last value.(For example : 'json': {
'value1': 14,
'value2':14, // , is not allowed in the last line
}) Also last line can't contain ; after }]
Use this for validation jsonlint
This is correct json:
[{
"type": "line",
"plotarea": {
"adjust-layout": true
},
"scale-x": {
"label": {
"text": "échelle essence gazoile"
},
"labels": ["sub01", "sub02", "sub02"]
},
"series": [{
"values": [1, 8, 1]
}, {
"values": [14, 13, 14]
}],
"name": "city A",
"elements": [{
"id": "c01",
"name": "name1",
"price": "15",
"qte": "10"
}, {
"id": "c02",
"name": "name2",
"price": "18",
"qte": "11"
}, {
"id": "c03",
"name": "name3",
"price": "11",
"qte": "14"
}],
"subsities": [{
"name": "sub A1",
"elements": [{
"id": "sub01",
"name": "nameSub1",
"price": "1",
"qte": "14"
}, {
"id": "sub02",
"name": "nameSub2",
"price": "8",
"qte": "13"
}, {
"id": "sub03",
"name": "nameSub3",
"price": "1",
"qte": "14"
}]
}, {
"name": "sub A2",
"elements": [{
"id": "ssub01",
"name": "nameSsub1",
"price": "1",
"qte": "7"
}, {
"id": "ssub02",
"name": "nameSsub2",
"price": "8",
"qte": "1"
}, {
"id": "ssub03",
"name": "nameSsub3",
"price": "4",
"qte": "19"
}]
}, {
"name": "sub A3",
"elements": [{
"id": "sssub01",
"name": "nameSssub1",
"price": "1",
"qte": "11"
}, {
"id": "sssub02",
"name": "nameSssub2",
"price": "2",
"qte": "15"
}, {
"id": "sssub03",
"name": "nameSssub3",
"price": "1",
"qte": "15"
}]
}]
}, {
"name": "city B",
"elements": [{
"id": "cc01",
"name": "name11",
"price": "10",
"qte": "11"
}, {
"id": "cc02",
"name": "name22",
"price": "14",
"qte": "19"
}, {
"id": "cc03",
"name": "name33",
"price": "11",
"qte": "18"
}]
}, {
"name": "city C",
"elements": [{
"id": "ccc01",
"name": "name111",
"price": "19",
"qte": "12"
}, {
"id": "ccc02",
"name": "name222",
"price": "18",
"qte": "17"
}, {
"id": "ccc03",
"name": "name333",
"price": "10",
"qte": "5"
}]
}]

the problem is that you have comments in your JSON. This is not allowed in pure json.
In addition you have some syntax errors:
Line 8 :"text": "échelle essence gazoile", the , has to be removed because it is the last property of the object
Line 26: "name": "name2', change the singlequote to a doublequote
Line 27: "price": "18,: add a doublequote at the end
Last line: }]; remove the semicolon
This is your valid json:
[{
"type": "line",
"plotarea": {
"adjust-layout": true
},
"scale-x": {
"label": {
"text": "échelle essence gazoile"
},
"labels": ["sub01", "sub02", "sub02"]
},
"series": [{
"values": [1, 8, 1]
}, {
"values": [14, 13, 14]
}],
"name": "city A",
"elements": [{
"id": "c01",
"name": "name1",
"price": "15",
"qte": "10"
}, {
"id": "c02",
"name": "name2",
"price": "18",
"qte": "11"
}, {
"id": "c03",
"name": "name3",
"price": "11",
"qte": "14"
}],
"subsities": [{
"name": "sub A1",
"elements": [{
"id": "sub01",
"name": "nameSub1",
"price": "1",
"qte": "14"
}, {
"id": "sub02",
"name": "nameSub2",
"price": "8",
"qte": "13"
}, {
"id": "sub03",
"name": "nameSub3",
"price": "1",
"qte": "14"
}]
}, {
"name": "sub A2",
"elements": [{
"id": "ssub01",
"name": "nameSsub1",
"price": "1",
"qte": "7"
}, {
"id": "ssub02",
"name": "nameSsub2",
"price": "8",
"qte": "1"
}, {
"id": "ssub03",
"name": "nameSsub3",
"price": "4",
"qte": "19"
}]
}, {
"name": "sub A3",
"elements": [{
"id": "sssub01",
"name": "nameSssub1",
"price": "1",
"qte": "11"
}, {
"id": "sssub02",
"name": "nameSssub2",
"price": "2",
"qte": "15"
}, {
"id": "sssub03",
"name": "nameSssub3",
"price": "1",
"qte": "15"
}]
}]
}, {
"name": "city B",
"elements": [{
"id": "cc01",
"name": "name11",
"price": "10",
"qte": "11"
}, {
"id": "cc02",
"name": "name22",
"price": "14",
"qte": "19"
}, {
"id": "cc03",
"name": "name33",
"price": "11",
"qte": "18"
}]
}, {
"name": "city C",
"elements": [{
"id": "ccc01",
"name": "name111",
"price": "19",
"qte": "12"
}, {
"id": "ccc02",
"name": "name222",
"price": "18",
"qte": "17"
}, {
"id": "ccc03",
"name": "name333",
"price": "10",
"qte": "5"
}]
}]

You cannot have a C Style or C# style comments inside a json document.As a matter of fact you cannot have any comments inside a json document
You can validate your json document on http://jsonlint.com/

You can try this# http://jsonlint.com/
this will validate your json and also gives you error where you are doing mistakes

How to add anther "entry" into this JSON?

I downloaded some JSON, as shown below. In the developer console it looks like an object containing nested objects which contain nested objects ...
I would like to add a new, empty "campaign" into the data (at the front). How do I do that?
Insert
var blankCampaignData = {'title': '', 'description': '', 'path_to_logo': '', 'start_time': date, 'end_time' : date, 'paused': false};
into
{
"campaigns": {
"1": {
"campaign_id": "1",
"title": "Nike Air 2015 campaign",
"description": null,
"path_to_logo": null,
"start_time": "09/11/2015 22:42:08",
"end_time": "09/03/2016 22:42:08",
"paused": "0",
"destinations": {
"1": {
"destination_id": "1",
"campaign_id": "1",
"url": "www.nike.com/nike_air",
"description": "Nike air destination",
"connections": {
"3": {
"connection_id": "3",
"destination_id": "1",
"tag_id": "0",
"country": "Scotland",
"county": "Yorkshire",
"town": "East Ham",
"post_code": "SE1 1AA",
"custom": "bus stop",
"description": "Connection number 3"
}
}
},
"2": {
"destination_id": "2",
"campaign_id": "1",
"url": "www.nike.com/nike_air/sub_campaign",
"description": "Nike air - free laces promotion destination",
"connections": {
"2": {
"connection_id": "2",
"destination_id": "2",
"tag_id": "0",
"country": "Engerland",
"county": "Devon",
"town": "East Ham",
"post_code": "SE1 1AA",
"custom": "bus stop",
"description": "Connection number 2"
},
"4": {
"connection_id": "4",
"destination_id": "2",
"tag_id": "0",
"country": "Engerland",
"county": "Yorkshire",
"town": "Felixswtowe",
"post_code": "RB3 9YR",
"custom": "police staticon",
"description": "Connection number 4"
},
"6": {
"connection_id": "6",
"destination_id": "2",
"tag_id": "0",
"country": "Scotland",
"county": "Essex",
"town": "York",
"post_code": "JD8 4LF",
"custom": "somewhere else",
"description": "Connection number 6"
},
"9": {
"connection_id": "9",
"destination_id": "2",
"tag_id": "0",
"country": "Scotland",
"county": "Cork",
"town": "York",
"post_code": "JD8 4LF",
"custom": "in the ladies' loo",
"description": "Connection number 9"
}
}
}
}
},
"2": {
"campaign_id": "2",
"title": "Nike football boots campaign",
"description": null,
"path_to_logo": null,
"start_time": "09/12/2015 22:42:08",
"end_time": "09/01/2016 22:42:08",
"paused": "0",
"destinations": {
"3": {
"destination_id": "3",
"campaign_id": "2",
"url": "www.nike.com/nike_football_boots/",
"description": "Nike footie boots destination",
"connections": {}
},
"4": {
"destination_id": "4",
"campaign_id": "2",
"url": "www.nike.com/nike_football_boots/sub_campaign",
"description": "Buy left boot, get right boot free destination",
"connections": {}
}
}
},
"3": {
"campaign_id": "3",
"title": "Nike general promotion campaign",
"description": null,
"path_to_logo": null,
"start_time": "09/12/2013 22:42:08",
"end_time": "09/08/2016 22:42:08",
"paused": "0",
"destinations": {
"5": {
"destination_id": "5",
"campaign_id": "3",
"url": "www.nike.com/general_promotion",
"description": "Nike general promotion destination",
"connections": {}
},
"6": {
"destination_id": "6",
"campaign_id": "3",
"url": "www.nike.com/general_promotion/discount_coupon",
"description": "20% off coupon destination",
"connections": {}
}
}
}
}
}

Work out what the next campaign id should be:
var nextId = +Object.keys(obj.campaigns).sort().pop() + 1;
Add the empty campaign to the campaigns object. Obviously you'll need to define date beforehand.
obj.campaigns[nextId] = {
'title': '',
'description': '',
'path_to_logo': '',
'start_time': date,
'end_time' : date,
'paused': false
}