Live Google Maps Update - Websockets

The following flow illustrates how you can use websockets to update a google map live with coordinates received.

To setup this flow drag the json on to your node-red canvas. You will need to ensure you have your websocket nodes set up correctly with the following settings.

Path: /ws/location
Send/Receive Payload

Once you have these configured the only other adjustment you may have to make is within the template function node which is wedged in the middle of the [get]map flow.

Open up the template function node and scroll down to the following line:

var socketaddy = "ws://";

Change the ip address to point to the ip of whatever you have hosting node-red.

Once that is complete just close the template node and hit deploy.

Browse to: http://node-redlocation/map

By default it will just drop to some random co-ordinate, if you use the injection nodes to inject values you will see the map jump to the co-ordinates supplied! In my actual flow I have owntracks feeding this instead of the inject nodes and you could even use the twitter lat/longitude flow to see live updates of where tweets are coming from.

The input should be in the format shown in the inject nodes, you can supply an array of these coordinates with as many as you want.

[{"id":"54651cc0.ab9ae4","type":"websocket-listener","path":"/ws/location","wholemsg":"false"},{"id":"eaebe5b5.151418","type":"websocket out","name":"","server":"54651cc0.ab9ae4","x":576,"y":175,"z":"d0ca7dde.2f358","wires":[]},{"id":"fff1c609.000e38","type":"function","name":"","func":"// The received message is stored in 'msg'\n// It will have at least a 'payload' property:\n//   console.log(msg.payload);\n// The 'context' object is available to store state\n// between invocations of the function\n//   context = {};\ = msg.payload;\n\nreturn msg;","outputs":1,"x":337,"y":149,"z":"d0ca7dde.2f358","wires":[["eaebe5b5.151418"]]},{"id":"2c6ab189.d3954e","type":"websocket in","name":"","server":"54651cc0.ab9ae4","x":166,"y":209,"z":"d0ca7dde.2f358","wires":[["6c05683f.93fa98"]]},{"id":"6c05683f.93fa98","type":"function","name":"","func":"// The received message is stored in 'msg'\n// It will have at least a 'payload' property:\n//   console.log(msg.payload);\n// The 'context' object is available to store state\n// between invocations of the function\n//   context = {};\n\nmsg.payload =;\nreturn msg;","outputs":1,"x":339,"y":215,"z":"d0ca7dde.2f358","wires":[["eaebe5b5.151418"]]},{"id":"971e5dc2.68e1a","type":"template","name":"","template":"<!DOCTYPE html>\n<html>\n<head>\n  <title>Owntracks & Node-Red Live Map</title>\n  <script type=\"text/javascript\" src=\"\"></script>\n  <script type=\"text/javascript\" src=\"\"></script>\n  <script type=\"text/javascript\" src=\"\"></script>\n \n  <style type=\"text/css\" media=\"screen\">\n    #map {\n      position:absolute;\n      top: 0; bottom: 0; left: 0; right: 0;\n    }\n  </style>\n</head>\n<body>\n \n  <div id=\"map\"></div>\n  <script type=\"text/javascript\">\n  var socketaddy = \"ws://\";\n    var map;\n    var sock;\n    $(document).ready(function(){\n      \n      map = new GMaps({\n        div: '#map',\n        lat: -12.043333,\n        lng: -77.028333\n      });\n      \n      \n      sock = new WebSocket(socketaddy);\n      sock.onopen = function(){ console.log(\"Connected websocket\");\n\t      console.log(\"Sending ping..\");\n\t      sock.send(\"Ping!\");\n\t      console.log(\"Ping sent..\");\n      };\n      sock.onerror = function(){ console.log(\"Websocket error\"); };\n      sock.onmessage = function(evt){\n        var latlng = JSON.parse(;\n        var array = $.map(latlng, function(el) {\n  \t\t\treturn [[, el.lng]];\n\t\t\t});\n        \n        map.removeMarkers();\n        map.removePolylines();\n       \tconsole.log(\"Got marker at \" + latlng[0].lat + \", \" + latlng[0].lng, latlng);\n        map.setZoom(17);\n       \tmap.setCenter(latlng[0].lat, latlng[0].lng);\n        map.addMarkers(latlng);\n      \tmap.drawPolyline({\n\t\t  path: array,\n\t\t  strokeColor: '#131540',\n\t\t  strokeOpacity: 0.6,\n\t\t  strokeWeight: 6\n\t\t});\n      }\n    });\n  </script>\n</body>\n</html>","x":369,"y":286,"z":"d0ca7dde.2f358","wires":[["b2bb0466.4d44f8"]]},{"id":"b2bb0466.4d44f8","type":"http response","name":"","x":553,"y":286,"z":"d0ca7dde.2f358","wires":[]},{"id":"bffd62ba.4002a","type":"http in","name":"","url":"/map","method":"get","x":148,"y":291,"z":"d0ca7dde.2f358","wires":[["971e5dc2.68e1a"]]},{"id":"73465be9.8cb9a4","type":"debug","name":"","active":true,"console":false,"complete":false,"x":413,"y":94,"z":"d0ca7dde.2f358","wires":[]},{"id":"256e06da.da91fa","type":"inject","name":"Array of Co-ords","topic":"","payload":"[{\"lat\":54.9619349,\"lng\":-1.6003813},{\"lat\":54.9656694,\"lng\":-1.5239833},{\"lat\":54.9696456,\"lng\":-1.5069755},{\"lat\":54.9378907,\"lng\":-1.5273729}]","payloadType":"string","repeat":"","crontab":"","once":false,"x":119,"y":98,"z":"d0ca7dde.2f358","wires":[["fff1c609.000e38","73465be9.8cb9a4"]]},{"id":"d0d2a343.2f2d6","type":"inject","name":"Single Co-ord","topic":"","payload":"[{\"lat\":54.9696456,\"lng\":-1.5069755}]","payloadType":"string","repeat":"","crontab":"","once":false,"x":109,"y":144,"z":"d0ca7dde.2f358","wires":[["fff1c609.000e38"]]}]

Flow Info

Created 10 years, 8 months ago
Updated 9 years, 2 months ago
Rating: not yet rated



Node Types

  • debug (x1)
  • function (x2)
  • http in (x1)
  • http response (x1)
  • inject (x2)
  • template (x1)
  • websocket in (x1)
  • websocket out (x1)
  • websocket-listener (x1)


  • websocket
  • googlemaps
Copy this flow JSON to your clipboard and then import into Node-RED using the Import From > Clipboard (Ctrl-I) menu option