Извлечение информации из ответа JSON [дубликат] ⇐ Jquery

[Anonymous]

Я пытаюсь получить последнее значение «TMiles» в следующем JSON.
[{
"__type": "MileageReport:http:\/\/pcmiler.alk.com\/APIs\/v1.0",
"RouteID": null,
"ReportLines": [{
"Stop": {
"Address": {
"StreetAddress": "Apple Park Way",
"City": "Cupertino",
"State": "CA",
"Zip": "95014",
"County": "Santa Clara",
"Country": "United States",
"SPLC": null,
"CountryPostalFilter": 0,
"AbbreviationFormat": 0,
"StateName": "California",
"StateAbbreviation": "CA",
"CountryAbbreviation": "US"
},
"Coords": {
"Lat": "37.334866",
"Lon": "-122.014282"
},
"Region": 4,
"Label": "",
"PlaceName": "",
"TimeZone": "PDT",
"Errors": [],
"SpeedLimitInfo": null,
"ConfidenceLevel": "Exact",
"DistanceFromRoad": 0,
"CrossStreet": null,
"TimeZoneOffset": "GMT-7:00",
"TimeZoneAbbreviation": "PDT",
"IsDST": true
},
"LMiles": "0.000",
"TMiles": "0.000",
"LCostMile": "0.00",
"TCostMile": "0.00",
"LHours": "0:00",
"THours": "0:00",
"LTolls": "0.00",
"TTolls": "0.00",
"LEstghg": "0.0",
"TEstghg": "0.0",
"EtaEtd": null
}, {
"Stop": {
"Address": {
"StreetAddress": "22-26 West 34th Street",
"City": "New York",
"State": "NY",
"Zip": "10001",
"County": "New York",
"Country": "United States",
"SPLC": null,
"CountryPostalFilter": 0,
"AbbreviationFormat": 0,
"StateName": "New York",
"StateAbbreviation": "NY",
"CountryAbbreviation": "US"
},
"Coords": {
"Lat": "40.748462",
"Lon": "-73.984770"
},
"Region": 4,
"Label": "",
"PlaceName": "",
"TimeZone": "EDT",
"Errors": [],
"SpeedLimitInfo": null,
"ConfidenceLevel": "Exact",
"DistanceFromRoad": 0.003,
"CrossStreet": null,
"TimeZoneOffset": "GMT-4:00",
"TimeZoneAbbreviation": "EDT",
"IsDST": true
},
"LMiles": "2945.142",
"TMiles": "2945.142",
"LCostMile": "5690.99",
"TCostMile": "5690.99",
"LHours": "55:44",
"THours": "55:44",
"LTolls": "284.55",
"TTolls": "284.55",
"LEstghg": "9788.0",
"TEstghg": "9788.0",
"EtaEtd": null
}],
"TrafficDataUsed": false
}]

Я пробовал использовать несколько методов, но безрезультатно. Вот что я попробовал:
dataM = 'supplied json'
var lastTMiles = dataM[0].ReportLines[dataM[0].ReportLines.length - 1].TMiles;

Вот моя ошибка:
Uncaught TypeError: Cannot read properties of undefined (reading 'length')
at reqhttpM.onreadystatechange (mileage-finder.asp:280:60)

Я не совсем понимаю, что здесь делать. Я отредактировал это, добавив вызов AJAX, и надеюсь, что это даст больше понимания того, что происходит.
function dictToParamString(obj) {
var str = [];
for (var p in obj) str.push(encodeURIComponent(p) + "=" + encodeURIComponent(obj[p]));
return str.join("&");
}

reqhttpM = new XMLHttpRequest();
var url = "https://pcmiler.alk.com/apis/rest/v1.0/ ... uteReports?";

//Lon first, then lat
var params = {
stops: sLon+','+sLat+';'+eLon+','+eLat,
reports: "Mileage"
};

var urlQuery = url + dictToParamString(params);
reqhttpM.open("GET", urlQuery, true);
reqhttpM.setRequestHeader("Content-type", "application/json");
reqhttpM.setRequestHeader("Authorization", "Z3AFB2A60E01D01840BB58D19928814B2D");
reqhttpM.responseType = "arraybuffer";

reqhttpM.onreadystatechange = function () {
// Call a function when the state changes.
if (reqhttpM.readyState == 4 && reqhttpM.status == 200) {
var res = reqhttpM.response;
if (res) {
var uInt8Array = new Uint8Array(res);
var i = uInt8Array.length;
var binaryString = new Array(i);
while (i--) {
binaryString = String.fromCharCode(uInt8Array);
}
dataM = binaryString.join('');

console.log(dataM);

//lastTMiles = dataM[0].ReportLines[dataM[0].ReportLines.length - 1].TMiles;

const [firstEntry] = dataM;
const { TMiles } = firstEntry.ReportLines.at(-1);

//const lastReportLine = dataM[0].ReportLines.pop();
//const lastTMiles = lastReportLine.TMiles;

console.log(lastTMiles)

//$('.miles').html(lastTMiles);

}
}
};

reqhttpM.send()


Подробнее здесь: https://stackoverflow.com/questions/790 ... n-response