First, you need some PAAS provider that allows storing functions (lambdas) and data. I recommend Back4App because they are great, and implement Parse API which is open and portable between platforms. Their free plan is great as well.

Start with creating a database called Visitor . That's where hits will be stored. Probably make sense to restrict possibility to delete for public to avoid vandals.

Next you create a simple function which will be called from your website. Function will store visitors hits:

// Make sure to not store ip. Because you know, GDPR laws are murky and fines are scary.
function hash(s) {
    return s.split('').reduce(function (acc, c) {
      return acc + c.charCodeAt(0);
    }, 0);
}

// Write to `Visitor` database we've just created
const Visitor = Parse.Object.extend('Visitor');
Parse.Cloud.define("hello", function(request, response){
    const token = hash(request.ip);
    const myNewObject = new Visitor();

    myNewObject.set('token', token);
    myNewObject.set('url', request.headers['referer']);
    myNewObject.set('browser', request.headers['user-agent']);

// As I'm using CloudFlare I can even get country data
    myNewObject.set('country', request.headers['cloudfront-viewer-country']);
    myNewObject.set('ref', request.params.ref);
    myNewObject.set('title', request.params.title);

    myNewObject.save()

    response.success("hello!");
});

On your website host some script to call this cloud function. You can look at mine for example.

After that hits will be available as rows in the Visitor database.

You can view it in CLI or connect to some dashboard. CLI using jq and spark will show date, visitors, page views and countries. Will look like this:

 📈 Blog
▁▂▁▁█▄▃
"2020-10-16"  106  220   " AT AU CA CH CZ DE DK FR GB HU IE IT LV ME NL NO NZ PL
"2020-10-17"  158  388   " AR AU BD BE BR CA CZ DE DK ES FI FR GB GU HU ID IL IQ
"2020-10-18"  52   110   " AR BR CA DE DK DO ES FI FR GB IT JP LU LV NZ SE SG US
"2020-10-19"  42   84    "AR AT AU BE BN BR CA CZ EG FR GB GR HU LV MX NL NZ US"
"2020-10-20"  577  3960  " AE AR AT AU BA BE BG BR BY CA CH CL CO CZ DE DK EE ES
"2020-10-21"  342  1603  " AE AR AT AU BE BG BR CA CL CO CZ DE DK EE ES FI FR GB
"2020-10-22"  225  635   "AR AT AU BA BE BH BR BY CA CH CL CZ DE EG ES FI FR GB 

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