Worldometers Country Data Extractor

extract.md

What is this

This bookmarklet extracts data from worlometers country pages into a downloadable csv file.

Installation

To install it:

1. If your bookmarks bar is hidden, display it: Ctrl + Shift + b.
2. Copy the following code into your clipboard. You'll need it in a sec.

javascript:(function(){function dump_data(){return{x:Highcharts.charts[0].series[0].data.map(d=>d.category),y:Highcharts.charts.map(c=>{return{name:c.renderTo.id,y:c.series[0].data.map(d=>d.y)}})}}
function data2csv(data){var csv='Date,'+data.y.map(y=>y.name).join(',')+'\n';var i;for(i=0;i<data.x.length;i++){csv+=data.x[i]+','+data.y.map(y=>y.y[i]).join(',')+'\n'}
return csv}
function download(filename,text){var element=document.createElement('a');element.setAttribute('href','data:text/plain;charset=utf-8,'+encodeURIComponent(text));element.setAttribute('download',filename);element.style.display='none';document.body.appendChild(element);element.click();document.body.removeChild(element)}
download('data.csv',data2csv(dump_data()))}())

3. Right click the bookmarks bar and select "Add Page".
4. Name it whatever you like.
5. Replace the URL field with the code you copied in step (2).

The bookmarklet is installed.

How to use it

To use it:

1. Go to a Countries page on Worldometers: US
2. Click the bookmarklet.
3. It should trigger a download for a CSV file that contains the extracted data.

The code

Here is the un-minified code if you want to see what's going on.

(function() {
    function dump_data() {
        return { 
            x: Highcharts.charts[0].series[0].data.map(d => d.category),
            y: Highcharts.charts.map(c => {return {name: c.renderTo.id, y: c.series[0].data.map(d=>d.y)}}) 
        };
    }
    function data2csv(data) {
        var csv = 'Date,' + data.y.map(y => y.name).join(',') + '\n';
        var i;
        for (i=0; i<data.x.length; i++) {
            csv += data.x[i] + ',' + data.y.map(y => y.y[i]).join(',') + '\n';
        }
        return csv;
    }
    function download(filename, text) {
        var element = document.createElement('a');
        element.setAttribute('href', 'data:text/plain;charset=utf-8,' + encodeURIComponent(text));
        element.setAttribute('download', filename);

        element.style.display = 'none';
        document.body.appendChild(element);

        element.click();

        document.body.removeChild(element);
    }
    download('data.csv', data2csv(dump_data()))
}())

This probably only works for country pages, but should be easy to modify to extract data from any worldometers graph.