Exceed 23 waypoint per request limit on Google Directions API (Business/Work level)

google-maps google-maps-api-3 google-directions-api
Marc H picture Marc H · Jan 8, 2012 · Viewed 55.7k times · Source

I would like to use the google directions API to develop route planning software for a company that handles snowplows in the winter and landscaping in the summer. One of the customers requirements is that he be able to calculate routes with at least 30 ( preferably more ) waypoints. According to the documentation (quoted below) even Google Maps API for Work customers are limited to just 23 waypoints per request.

Use of the Google Directions API is subject to a query limit of 2,500 directions requests per day. Individual directions requests may contain up to 8 intermediate waypoints in the request. Google Maps API for Work customers may query up to 100,000 directions requests per day, with up to 23 waypoints allowed in each request.

Is anyone aware of a workaround -- any way at all -- to get around this?

Also -- might it be possible to use a workaround for the free API? I hear the premier accounts are quite expensive.

Thanks!! Marc

Answer

mikep picture mikep · Apr 17, 2017 

function initMap() {
    var service = new google.maps.DirectionsService;
    var map = new google.maps.Map(document.getElementById('map'));

    // list of points
    var stations = [
        {lat: 48.9812840, lng: 21.2171920, name: 'Station 1'},
        {lat: 48.9832841, lng: 21.2176398, name: 'Station 2'},
        {lat: 48.9856443, lng: 21.2209088, name: 'Station 3'},
        {lat: 48.9861461, lng: 21.2261563, name: 'Station 4'},
        {lat: 48.9874682, lng: 21.2294855, name: 'Station 5'},
        {lat: 48.9909244, lng: 21.2295512, name: 'Station 6'},
        {lat: 48.9928871, lng: 21.2292352, name: 'Station 7'},
        {lat: 48.9921334, lng: 21.2246742, name: 'Station 8'},
        {lat: 48.9943196, lng: 21.2234792, name: 'Station 9'},
        {lat: 48.9966345, lng: 21.2221262, name: 'Station 10'},
        {lat: 48.9981191, lng: 21.2271386, name: 'Station 11'},
        {lat: 49.0009168, lng: 21.2359527, name: 'Station 12'},
        {lat: 49.0017950, lng: 21.2392890, name: 'Station 13'},
        {lat: 48.9991912, lng: 21.2398272, name: 'Station 14'},
        {lat: 48.9959850, lng: 21.2418410, name: 'Station 15'},
        {lat: 48.9931772, lng: 21.2453901, name: 'Station 16'},
        {lat: 48.9963512, lng: 21.2525850, name: 'Station 17'},
        {lat: 48.9985134, lng: 21.2508423, name: 'Station 18'},
        {lat: 49.0085000, lng: 21.2508000, name: 'Station 19'},
        {lat: 49.0093000, lng: 21.2528000, name: 'Station 20'},
        {lat: 49.0103000, lng: 21.2560000, name: 'Station 21'},
        {lat: 49.0112000, lng: 21.2590000, name: 'Station 22'},
        {lat: 49.0124000, lng: 21.2620000, name: 'Station 23'},
        {lat: 49.0135000, lng: 21.2650000, name: 'Station 24'},
        {lat: 49.0149000, lng: 21.2680000, name: 'Station 25'},
        {lat: 49.0171000, lng: 21.2710000, name: 'Station 26'},
        {lat: 49.0198000, lng: 21.2740000, name: 'Station 27'},
        {lat: 49.0305000, lng: 21.3000000, name: 'Station 28'},
    ];
    
    // Zoom and center map automatically by stations (each station will be in visible map area)
    var lngs = stations.map(function(station) { return station.lng; });
    var lats = stations.map(function(station) { return station.lat; });
    map.fitBounds({
        west: Math.min.apply(null, lngs),
        east: Math.max.apply(null, lngs),
        north: Math.min.apply(null, lats),
        south: Math.max.apply(null, lats),
    });
    
    // Show stations on the map as markers
    for (var i = 0; i < stations.length; i++) {
        if (!stations[i].name)
            continue;
        new google.maps.Marker({
            position: stations[i],
            map: map,
            title: stations[i].name
        });
    }

    // Divide route to several parts because max stations limit is 25 (23 waypoints + 1 origin + 1 destination)
    for (var i = 0, parts = [], max = 8 - 1; i < stations.length; i = i + max)
        parts.push(stations.slice(i, i + max + 1));

    // Callback function to process service results
    var service_callback = function(response, status) {
        if (status != 'OK') {
            console.log('Directions request failed due to ' + status);
            return;
        }
        var renderer = new google.maps.DirectionsRenderer;
        renderer.setMap(map);
        renderer.setOptions({ suppressMarkers: true, preserveViewport: true });
        renderer.setDirections(response);
    };
        
    // Send requests to service to get route (for stations count <= 25 only one request will be sent)
    for (var i = 0; i < parts.length; i++) {
        // Waypoints does not include first station (origin) and last station (destination)
        var waypoints = [];
        for (var j = 1; j < parts[i].length - 1; j++)
            waypoints.push({location: parts[i][j], stopover: false});
        // Service options
        var service_options = {
            origin: parts[i][0],
            destination: parts[i][parts[i].length - 1],
            waypoints: waypoints,
            travelMode: 'WALKING'
        };
        // Send request
        service.route(service_options, service_callback);
    }
  }
html, body {
    height: 100%;
    margin: 0;
    padding: 0;
}
#map {
    height: 100%;     
    width: 100%;
    height: 100%;
}
<div id="map"></div>

<!-- without API KEY set variable "max" to 8 -->
<script async defer src="https://maps.googleapis.com/maps/api/js?callback=initMap"></script>

<!-- with API KEY set variable "max" to 25 -->
<!-- <script async defer src="https://maps.googleapis.com/maps/api/js?callback=initMap&key=YOUR_API_KEY"></script>-->

With following code you can use as many waypoints as you need and you will never get error MAX_WAYPOINTS_EXCEEDED. Do not forget to replace "YOUR_API_KEY" to your API KEY or remove &key=YOUR_API_KEY from google API URL and set variable "max" to 8 (max = 25 when using API KEY, max = 8 when not using API KEY).

<style>
html, body { height: 100%; margin: 0; padding: 0; }
#map { height: 100%; width: 100%; height: 100%; }
</style>
<div id="map"></div>
<script>
  function initMap() {
    var service = new google.maps.DirectionsService;
    var map = new google.maps.Map(document.getElementById('map'));

    // list of points
    var stations = [
        {lat: 48.9812840, lng: 21.2171920, name: 'Station 1'},
        {lat: 48.9832841, lng: 21.2176398, name: 'Station 2'},
        {lat: 48.9856443, lng: 21.2209088, name: 'Station 3'},
        {lat: 48.9861461, lng: 21.2261563, name: 'Station 4'},
        {lat: 48.9874682, lng: 21.2294855, name: 'Station 5'},
        {lat: 48.9909244, lng: 21.2295512, name: 'Station 6'},
        {lat: 48.9928871, lng: 21.2292352, name: 'Station 7'},
        {lat: 48.9921334, lng: 21.2246742, name: 'Station 8'},
        {lat: 48.9943196, lng: 21.2234792, name: 'Station 9'},
        {lat: 48.9966345, lng: 21.2221262, name: 'Station 10'},
        {lat: 48.9981191, lng: 21.2271386, name: 'Station 11'},
        {lat: 49.0009168, lng: 21.2359527, name: 'Station 12'},
        {lat: 49.0017950, lng: 21.2392890, name: 'Station 13'},
        {lat: 48.9991912, lng: 21.2398272, name: 'Station 14'},
        {lat: 48.9959850, lng: 21.2418410, name: 'Station 15'},
        {lat: 48.9931772, lng: 21.2453901, name: 'Station 16'},
        {lat: 48.9963512, lng: 21.2525850, name: 'Station 17'},
        {lat: 48.9985134, lng: 21.2508423, name: 'Station 18'},
        {lat: 49.0085000, lng: 21.2508000, name: 'Station 19'},
        {lat: 49.0093000, lng: 21.2528000, name: 'Station 20'},
        {lat: 49.0103000, lng: 21.2560000, name: 'Station 21'},
        {lat: 49.0112000, lng: 21.2590000, name: 'Station 22'},
        {lat: 49.0124000, lng: 21.2620000, name: 'Station 23'},
        {lat: 49.0135000, lng: 21.2650000, name: 'Station 24'},
        {lat: 49.0149000, lng: 21.2680000, name: 'Station 25'},
        {lat: 49.0171000, lng: 21.2710000, name: 'Station 26'},
        {lat: 49.0198000, lng: 21.2740000, name: 'Station 27'},
        {lat: 49.0305000, lng: 21.3000000, name: 'Station 28'},
        // ... as many other stations as you need
    ];

    // Zoom and center map automatically by stations (each station will be in visible map area)
    var lngs = stations.map(function(station) { return station.lng; });
    var lats = stations.map(function(station) { return station.lat; });
    map.fitBounds({
        west: Math.min.apply(null, lngs),
        east: Math.max.apply(null, lngs),
        north: Math.min.apply(null, lats),
        south: Math.max.apply(null, lats),
    });

    // Show stations on the map as markers
    for (var i = 0; i < stations.length; i++) {
        new google.maps.Marker({
            position: stations[i],
            map: map,
            title: stations[i].name
        });
    }

    // Divide route to several parts because max stations limit is 25 (23 waypoints + 1 origin + 1 destination)
    for (var i = 0, parts = [], max = 25 - 1; i < stations.length; i = i + max)
        parts.push(stations.slice(i, i + max + 1));

    // Service callback to process service results
    var service_callback = function(response, status) {
        if (status != 'OK') {
            console.log('Directions request failed due to ' + status);
            return;
        }
        var renderer = new google.maps.DirectionsRenderer;
        renderer.setMap(map);
        renderer.setOptions({ suppressMarkers: true, preserveViewport: true });
        renderer.setDirections(response);
    };

    // Send requests to service to get route (for stations count <= 25 only one request will be sent)
    for (var i = 0; i < parts.length; i++) {
        // Waypoints does not include first station (origin) and last station (destination)
        var waypoints = [];
        for (var j = 1; j < parts[i].length - 1; j++)
            waypoints.push({location: parts[i][j], stopover: false});
        // Service options
        var service_options = {
            origin: parts[i][0],
            destination: parts[i][parts[i].length - 1],
            waypoints: waypoints,
            travelMode: 'WALKING'
        };
        // Send request
        service.route(service_options, service_callback);
    }
  }
</script>
<script async defer src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap"></script>

You can see screen here.

fiddle with show/hide line buttons

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