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Node.js Examples

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(Node.js) Google Maps Geolocation Request

Demonstrates how make a Google Maps Geolocation REST API request.

Install Chilkat for Node.js and Electron using npm at

Chilkat npm packages for Node.js

Chilkat npm packages for Electron

on Windows, Linux, MacOSX, and ARM

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node11-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node11-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node11-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node11-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node11-linux64');
    }
} else if (os.platform() == 'darwin') {
    var chilkat = require('@chilkat/ck-node11-macosx');
}

function chilkatExample() {

    // This example duplicates the following CURL request:
    // curl -d @your_filename.json -H "Content-Type: application/json" -i "https://www.googleapis.com/geolocation/v1/geolocate?key=YOUR_API_KEY"

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    var rest = new chilkat.Rest();

    // Connect to the Google API REST server.
    var bTls = true;
    var port = 443;
    var bAutoReconnect = true;
    var success = rest.Connect("www.googleapis.com",port,bTls,bAutoReconnect);

    // Add the Content-Type request header.
    rest.AddHeader("Content-Type","application/json");

    // Add your API key as a query parameter
    rest.AddQueryParam("key","YOUR_API_KEY");

    // The JSON query is contained in the body of the HTTP POST.
    // This is a sample query (which we'll dynamically build in this example)
    // { 
    //  "homeMobileCountryCode": 310,
    //  "homeMobileNetworkCode": 260,
    //  "radioType": "gsm",
    //  "carrier": "T-Mobile",
    //  "cellTowers": [
    //   {
    //    "cellId": 39627456,
    //    "locationAreaCode": 40495,
    //    "mobileCountryCode": 310,
    //    "mobileNetworkCode": 260,
    //    "age": 0,
    //    "signalStrength": -95
    //   }
    //  ],
    //  "wifiAccessPoints": [
    //   { 
    //    "macAddress": "01:23:45:67:89:AB",
    //    "signalStrength": 8,
    //    "age": 0,
    //    "signalToNoiseRatio": -65,
    //    "channel": 8
    //   },
    //   { 
    //    "macAddress": "01:23:45:67:89:AC",
    //    "signalStrength": 4,
    //    "age": 0
    //   }
    //  ]
    // }

    var json = new chilkat.JsonObject();
    json.AppendInt("homeMobileCountryCode",310);
    json.AppendInt("homeMobileNetworkCode",260);
    json.AppendString("radioType","gsm");
    json.AppendString("carrier","T-Mobile");
    // aCellTowers: JsonArray
    var aCellTowers = json.AppendArray("cellTowers");
    aCellTowers.AddObjectAt(0);
    // oCellTower: JsonObject
    var oCellTower = aCellTowers.ObjectAt(0);
    oCellTower.AppendInt("cellId",39627456);
    oCellTower.AppendInt("locationAreaCode",40495);
    oCellTower.AppendInt("mobileCountryCode",310);
    oCellTower.AppendInt("mobileNetworkCode",260);
    oCellTower.AppendInt("age",0);
    oCellTower.AppendInt("signalStrength",-95);

    // aWifi: JsonArray
    var aWifi = json.AppendArray("wifiAccessPoints");
    aWifi.AddObjectAt(0);
    // oPoint: JsonObject
    var oPoint = aWifi.ObjectAt(0);
    oPoint.AppendString("macAddress","01:23:45:67:89:AB");
    oPoint.AppendInt("signalStrength",8);
    oPoint.AppendInt("age",0);
    oPoint.AppendInt("signalToNoiseRatio",-65);
    oPoint.AppendInt("channel",8);

    aWifi.AddObjectAt(1);
    oPoint = aWifi.ObjectAt(1);
    oPoint.AppendString("macAddress","01:23:45:67:89:AC");
    oPoint.AppendInt("signalStrength",4);
    oPoint.AppendInt("age",0);

    var responseJson = rest.FullRequestString("POST","/geolocation/v1/geolocate",json.Emit());
    if (rest.LastMethodSuccess !== true) {
        console.log(rest.LastErrorText);
        return;
    }

    // When successful, the response code is 200.
    if (rest.ResponseStatusCode !== 200) {
        // Examine the request/response to see what happened.
        console.log("response status code = " + rest.ResponseStatusCode);
        console.log("response status text = " + rest.ResponseStatusText);
        console.log("response header: " + rest.ResponseHeader);
        console.log("response JSON: " + responseJson);
        console.log("---");
        console.log("LastRequestStartLine: " + rest.LastRequestStartLine);
        console.log("LastRequestHeader: " + rest.LastRequestHeader);
        return;
    }

    json.EmitCompact = false;
    console.log("JSON request body: " + json.Emit());

    // The JSON response should look like this:
    // { 
    //  "location": {
    //   "lat": 37.4248297,
    //   "lng": -122.07346549999998
    //  },
    //  "accuracy": 1145.0
    // }

    console.log("JSON response: " + responseJson);

    var jsonResp = new chilkat.JsonObject();
    jsonResp.Load(responseJson);

    // jsonLoc: JsonObject
    var jsonLoc = jsonResp.ObjectOf("location");
    // Any JSON value can be obtained as a string..
    var latitude = jsonLoc.StringOf("lat");
    console.log("latitude = " + latitude);
    var longitude = jsonLoc.StringOf("lng");
    console.log("longitude = " + longitude);

    var accuracy = jsonResp.StringOf("accuracy");
    console.log("accuracy = " + accuracy);

}

chilkatExample();

 

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