W3Schools Tryit Editor

<!DOCTYPE html>
<html>
<body>

<h1>JavaScript Numbers</h1>
<h2>The toLocaleString() Method</h2>

toLocaleString() returns a number as a string, using local language format.

Legal language codes:

<code>
<script>
let n = 1000000;
let text = "";
text += "ar-SA: " + n.toLocaleString("ar-SA") + " ";
text += "bn-BD: " + n.toLocaleString("bn-BD") + " ";
text += "bn-IN: " + n.toLocaleString("bn-IN") + " ";
text += "cs-CZ: " + n.toLocaleString("cs-CZ") + " ";
text += "da-DK: " + n.toLocaleString("da-DK") + " ";
text += "de-AT: " + n.toLocaleString("de-AT") + " ";
text += "de-CH: " + n.toLocaleString("de-CH") + " ";
text += "de-DE: " + n.toLocaleString("de-DE") + " ";
text += "el-GR: " + n.toLocaleString("el-GR") + " ";
text += "en-AU: " + n.toLocaleString("en-AU") + " ";
text += "en-CA: " + n.toLocaleString("en-CA") + " ";
text += "en-GB: " + n.toLocaleString("en-GB") + " ";
text += "en-IE: " + n.toLocaleString("en-IE") + " ";
text += "en-IN: " + n.toLocaleString("en-IN") + " ";
text += "en-NZ: " + n.toLocaleString("en-NZ") + " ";
text += "en-US: " + n.toLocaleString("en-US") + " ";
text += "en-ZA: " + n.toLocaleString("en-ZA") + " ";
text += "es-AR: " + n.toLocaleString("es-AR") + " ";
text += "es-CL: " + n.toLocaleString("es-CL") + " ";
text += "es-CO: " + n.toLocaleString("es-CO") + " ";
text += "es-ES: " + n.toLocaleString("es-ES") + " ";
text += "es-MX: " + n.toLocaleString("es-MX") + " ";
text += "es-US: " + n.toLocaleString("es-US") + " ";
text += "fi-FI: " + n.toLocaleString("fi-FI") + " ";
text += "fr-BE: " + n.toLocaleString("fr-BE") + " ";
text += "fr-CA: " + n.toLocaleString("fr-CA") + " ";
text += "fr-CH: " + n.toLocaleString("fr-CH") + " ";
text += "fr-FR: " + n.toLocaleString("fr-FR") + " ";
text += "he-IL: " + n.toLocaleString("he-IL") + " ";
text += "hi-IN: " + n.toLocaleString("hi-IN") + " ";
text += "hu-HU: " + n.toLocaleString("hu-HU") + " ";
text += "id-ID: " + n.toLocaleString("id-ID") + " ";
text += "it-CH: " + n.toLocaleString("it-CH") + " ";
text += "it-IT: " + n.toLocaleString("it-IT") + " ";
text += "ja-JP: " + n.toLocaleString("ja-JP") + " ";
text += "ko-KR: " + n.toLocaleString("ko-KR") + " ";
text += "nl-BE: " + n.toLocaleString("nl-BE") + " ";
text += "nl-NL: " + n.toLocaleString("nl-NL") + " ";
text += "no-NO: " + n.toLocaleString("no-NO") + " ";
text += "pl-PL: " + n.toLocaleString("pl-PL") + " ";
text += "pt-BR: " + n.toLocaleString("pt-BR") + " ";
text += "pt-PT: " + n.toLocaleString("pt-PT") + " ";
text += "ro-RO: " + n.toLocaleString("ro-RO") + " ";
text += "ru-RU: " + n.toLocaleString("ru-RU") + " ";
text += "sk-SK: " + n.toLocaleString("sk-SK") + " ";
text += "sv-SE: " + n.toLocaleString("sv-SE") + " ";
text += "ta-IN: " + n.toLocaleString("ta-IN") + " ";
text += "ta-LK: " + n.toLocaleString("ta-LK") + " ";
text += "th-TH: " + n.toLocaleString("th-TH") + " ";
text += "tr-TR: " + n.toLocaleString("tr-TR") + " ";
text += "zh-CN: " + n.toLocaleString("zh-CN") + " ";
text += "zh-HK: " + n.toLocaleString("zh-HK") + " ";
text += "zh-TW: " + n.toLocaleString("zh-TW") + " ";

document.getElementById("demo").innerHTML = text;
</script>
</code>

</body>
</html>

​x
 
<!DOCTYPE html><html><body>​<h1>JavaScript Numbers</h1><h2>The toLocaleString() Method</h2>​<p>toLocaleString() returns a number as a string, using local language format.</p>​<p>Legal language codes:</p><p id="demo"></p>​<code><script>let n = 1000000;let text = "";text += "ar-SA: " + n.toLocaleString("ar-SA") + "<br>";text += "bn-BD: " + n.toLocaleString("bn-BD") + "<br>";text += "bn-IN: " + n.toLocaleString("bn-IN") + "<br>";text += "cs-CZ: " + n.toLocaleString("cs-CZ") + "<br>";text += "da-DK: " + n.toLocaleString("da-DK") + "<br>";text += "de-AT: " + n.toLocaleString("de-AT") + "<br>";text += "de-CH: " + n.toLocaleString("de-CH") + "<br>";text += "de-DE: " + n.toLocaleString("de-DE") + "<br>";text += "el-GR: " + n.toLocaleString("el-GR") + "<br>";text += "en-AU: " + n.toLocaleString("en-AU") + "<br>";text += "en-CA: " + n.toLocaleString("en-CA") + "<br>";text += "en-GB: " + n.toLocaleString("en-GB") + "<br>";text += "en-IE: " + n.toLocaleString("en-IE") + "<br>";text += "en-IN: " + n.toLocaleString("en-IN") + "<br>";text += "en-NZ: " + n.toLocaleString("en-NZ") + "<br>";text += "en-US: " + n.toLocaleString("en-US") + "<br>";text += "en-ZA: " + n.toLocaleString("en-ZA") + "<br>";text += "es-AR: " + n.toLocaleString("es-AR") + "<br>";text += "es-CL: " + n.toLocaleString("es-CL") + "<br>";text += "es-CO: " + n.toLocaleString("es-CO") + "<br>";text += "es-ES: " + n.toLocaleString("es-ES") + "<br>";text += "es-MX: " + n.toLocaleString("es-MX") + "<br>";text += "es-US: " + n.toLocaleString("es-US") + "<br>";text += "fi-FI: " + n.toLocaleString("fi-FI") + "<br>";text += "fr-BE: " + n.toLocaleString("fr-BE") + "<br>";text += "fr-CA: " + n.toLocaleString("fr-CA") + "<br>";text += "fr-CH: " + n.toLocaleString("fr-CH") + "<br>";text += "fr-FR: " + n.toLocaleString("fr-FR") + "<br>";text += "he-IL: " + n.toLocaleString("he-IL") + "<br>";text += "hi-IN: " + n.toLocaleString("hi-IN") + "<br>";