Some interactive map JS libraries

Filed under: programming

First, I tried google maps API. It was easy to set up but very quickly I hit the API rate limit.

Example from Google:

function initMap() {
  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 8,
    center: {lat: -34.397, lng: 150.644}
  var geocoder = new google.maps.Geocoder();

  document.getElementById('submit').addEventListener('click', function() {
    geocodeAddress(geocoder, map);

function geocodeAddress(geocoder, resultsMap) {
  var address = document.getElementById('address').value;
  geocoder.geocode({'address': address}, function(results, status) {
    if (status === google.maps.GeocoderStatus.OK) {
      var marker = new google.maps.Marker({
        map: resultsMap,
        position: results[0].geometry.location
    } else {
      alert('Geocode was not successful for the following reason: ' + status);

It produced a nice map with red markers. I’d end up with many more data points on a map and so continued looking for other options.

I next tried to use Kartograph.js, but I struggled a bit too long to get the geo information plotted.

In the end I went with LeafletJS because it was easy to customize and free to use.

It’s easy to get started, as seen from their Leaflet Quick Start Guide

Add supporting files:

<link rel="stylesheet" href="" />
<script src=""></script>

Then you can configure the map…

var map ='map').setView([40.7101, -84.0066], 4);
L.tileLayer('http://{s}{z}/{x}/{y}.png', {
    attribution: '&copy;',
    maxZoom: 18

From there I went ahead with using markers with custom icons

Map shows the past day of sneaker sales (Jordans, Yeezy's, Flyknights) plotted with LeafletJS. Data from eBay, processed with Kafka, Spark Streaming, and stored in Cassandra. #sneakeranalytics #sneakers #api #programming #databases #sql #datascience #dataengineering #javascript #python #coder #aws #saas

A photo posted by Katy Chuang, PhD ( on