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    <p>I suggest using phpjs.org 's <a href="http://phpjs.org/functions/number_format:481" rel="noreferrer">number_format()</a></p> <pre><code>function number_format(number, decimals, dec_point, thousands_sep) { // http://kevin.vanzonneveld.net // + original by: Jonas Raoni Soares Silva (http://www.jsfromhell.com) // + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net) // + bugfix by: Michael White (http://getsprink.com) // + bugfix by: Benjamin Lupton // + bugfix by: Allan Jensen (http://www.winternet.no) // + revised by: Jonas Raoni Soares Silva (http://www.jsfromhell.com) // + bugfix by: Howard Yeend // + revised by: Luke Smith (http://lucassmith.name) // + bugfix by: Diogo Resende // + bugfix by: Rival // + input by: Kheang Hok Chin (http://www.distantia.ca/) // + improved by: davook // + improved by: Brett Zamir (http://brett-zamir.me) // + input by: Jay Klehr // + improved by: Brett Zamir (http://brett-zamir.me) // + input by: Amir Habibi (http://www.residence-mixte.com/) // + bugfix by: Brett Zamir (http://brett-zamir.me) // + improved by: Theriault // + improved by: Drew Noakes // * example 1: number_format(1234.56); // * returns 1: '1,235' // * example 2: number_format(1234.56, 2, ',', ' '); // * returns 2: '1 234,56' // * example 3: number_format(1234.5678, 2, '.', ''); // * returns 3: '1234.57' // * example 4: number_format(67, 2, ',', '.'); // * returns 4: '67,00' // * example 5: number_format(1000); // * returns 5: '1,000' // * example 6: number_format(67.311, 2); // * returns 6: '67.31' // * example 7: number_format(1000.55, 1); // * returns 7: '1,000.6' // * example 8: number_format(67000, 5, ',', '.'); // * returns 8: '67.000,00000' // * example 9: number_format(0.9, 0); // * returns 9: '1' // * example 10: number_format('1.20', 2); // * returns 10: '1.20' // * example 11: number_format('1.20', 4); // * returns 11: '1.2000' // * example 12: number_format('1.2000', 3); // * returns 12: '1.200' var n = !isFinite(+number) ? 0 : +number, prec = !isFinite(+decimals) ? 0 : Math.abs(decimals), sep = (typeof thousands_sep === 'undefined') ? ',' : thousands_sep, dec = (typeof dec_point === 'undefined') ? '.' : dec_point, toFixedFix = function (n, prec) { // Fix for IE parseFloat(0.55).toFixed(0) = 0; var k = Math.pow(10, prec); return Math.round(n * k) / k; }, s = (prec ? toFixedFix(n, prec) : Math.round(n)).toString().split('.'); if (s[0].length &gt; 3) { s[0] = s[0].replace(/\B(?=(?:\d{3})+(?!\d))/g, sep); } if ((s[1] || '').length &lt; prec) { s[1] = s[1] || ''; s[1] += new Array(prec - s[1].length + 1).join('0'); } return s.join(dec); } </code></pre> <hr> <p><strong>UPDATE 02/13/14</strong></p> <p>People have been reporting this doesn't work as expected, so I did a <a href="http://jsfiddle.net/drewnoakes/xc3qh35z/" rel="noreferrer">JS Fiddle</a> that includes automated tests.</p> <p><strong>Update 26/11/2017</strong></p> <p>Here's that fiddle as a Stack Snippet with slightly modified output:</p> <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false"> <div class="snippet-code"> <pre class="snippet-code-js lang-js prettyprint-override"><code>function number_format(number, decimals, dec_point, thousands_sep) { // http://kevin.vanzonneveld.net // + original by: Jonas Raoni Soares Silva (http://www.jsfromhell.com) // + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net) // + bugfix by: Michael White (http://getsprink.com) // + bugfix by: Benjamin Lupton // + bugfix by: Allan Jensen (http://www.winternet.no) // + revised by: Jonas Raoni Soares Silva (http://www.jsfromhell.com) // + bugfix by: Howard Yeend // + revised by: Luke Smith (http://lucassmith.name) // + bugfix by: Diogo Resende // + bugfix by: Rival // + input by: Kheang Hok Chin (http://www.distantia.ca/) // + improved by: davook // + improved by: Brett Zamir (http://brett-zamir.me) // + input by: Jay Klehr // + improved by: Brett Zamir (http://brett-zamir.me) // + input by: Amir Habibi (http://www.residence-mixte.com/) // + bugfix by: Brett Zamir (http://brett-zamir.me) // + improved by: Theriault // + improved by: Drew Noakes // * example 1: number_format(1234.56); // * returns 1: '1,235' // * example 2: number_format(1234.56, 2, ',', ' '); // * returns 2: '1 234,56' // * example 3: number_format(1234.5678, 2, '.', ''); // * returns 3: '1234.57' // * example 4: number_format(67, 2, ',', '.'); // * returns 4: '67,00' // * example 5: number_format(1000); // * returns 5: '1,000' // * example 6: number_format(67.311, 2); // * returns 6: '67.31' // * example 7: number_format(1000.55, 1); // * returns 7: '1,000.6' // * example 8: number_format(67000, 5, ',', '.'); // * returns 8: '67.000,00000' // * example 9: number_format(0.9, 0); // * returns 9: '1' // * example 10: number_format('1.20', 2); // * returns 10: '1.20' // * example 11: number_format('1.20', 4); // * returns 11: '1.2000' // * example 12: number_format('1.2000', 3); // * returns 12: '1.200' var n = !isFinite(+number) ? 0 : +number, prec = !isFinite(+decimals) ? 0 : Math.abs(decimals), sep = (typeof thousands_sep === 'undefined') ? ',' : thousands_sep, dec = (typeof dec_point === 'undefined') ? '.' : dec_point, toFixedFix = function (n, prec) { // Fix for IE parseFloat(0.55).toFixed(0) = 0; var k = Math.pow(10, prec); return Math.round(n * k) / k; }, s = (prec ? toFixedFix(n, prec) : Math.round(n)).toString().split('.'); if (s[0].length &gt; 3) { s[0] = s[0].replace(/\B(?=(?:\d{3})+(?!\d))/g, sep); } if ((s[1] || '').length &lt; prec) { s[1] = s[1] || ''; s[1] += new Array(prec - s[1].length + 1).join('0'); } return s.join(dec); } var exampleNumber = 1; function test(expected, number, decimals, dec_point, thousands_sep) { var actual = number_format(number, decimals, dec_point, thousands_sep); console.log( 'Test case ' + exampleNumber + ': ' + '(decimals: ' + (typeof decimals === 'undefined' ? '(default)' : decimals) + ', dec_point: "' + (typeof dec_point === 'undefined' ? '(default)' : dec_point) + '"' + ', thousands_sep: "' + (typeof thousands_sep === 'undefined' ? '(default)' : thousands_sep) + '")' ); console.log(' =&gt; ' + (actual === expected ? 'Passed' : 'FAILED') + ', got "' + actual + '", expected "' + expected + '".'); exampleNumber++; } test('1,235', 1234.56); test('1 234,56', 1234.56, 2, ',', ' '); test('1234.57', 1234.5678, 2, '.', ''); test('67,00', 67, 2, ',', '.'); test('1,000', 1000); test('67.31', 67.311, 2); test('1,000.6', 1000.55, 1); test('67.000,00000', 67000, 5, ',', '.'); test('1', 0.9, 0); test('1.20', '1.20', 2); test('1.2000', '1.20', 4); test('1.200', '1.2000', 3);</code></pre> <pre class="snippet-code-css lang-css prettyprint-override"><code>.as-console-wrapper { max-height: 100% !important; }</code></pre> </div> </div> </p>
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    1. POHow to print a number with commas as thousands separators in JavaScript
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    1. USKerry Jones
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    1. CONot that I marked it down, but I believe people did so because it does not work. As it stands I find even some of your tests to not work.
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      1. USAndrew S
    2. CO@Andrew S -- Only 1 person has marked it down. It does work, I have used it in my own code many times. It's also not my code (nor my tests), I referenced the site that it comes from, which is a well-known site. Perhaps they have an updated version of it) as the code you are looking at is 3 years old.
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