Source: https://stackoverflow.com/a/40724354

For formatting / displaying large numbers (e.g. likes, views)

const SI_SYMBOL = ["", "k", "M", "G", "T", "P", "E"];

function abbreviateNumber(number){
    // what tier? (determines SI symbol)
    const tier = Math.log10(Math.abs(number)) / 3 | 0;

    // if zero, we don't need a suffix
    if(tier == 0) return number;

    // get suffix and determine scale
    const suffix = SI_SYMBOL[tier];
    const scale = 10 ** (tier * 3);

    // scale the number
    const scaled = number / scale;

    // format number and add suffix
    return scaled.toFixed(1) + suffix;
}

Source: https://stackoverflow.com/a/60988355

ES2020 adds support for this in Intl.NumberFormat Using notation as follows:

let formatter = Intl.NumberFormat('en', { notation: 'compact' });
// example 1
let million = formatter.format(1e6);
// example 2
let billion = formatter.format(1e9);
// print
console.log(million == '1M', billion == '1B');

538000cookie-checkAbbreviate numbersno