JavaScript - how to convert string to lowercase?

In this quick article, we are going to discuss how to convert string to lower case in JavaScript. String class contains two methods that help to make conversion to lower case. One of them allows to make conversion with taking at account locale. To see practical usage of methods look at below examples.

1. Built-in conversion approach example

With this appoach it is possible to convert any string to lower case.

// ONLINE-RUNNER:browser;

var text = 'Hi! How are you?';
var convertedText = text.toLowerCase();

console.log(convertedText);

2. Built-in conversion approach with locale example

This section shows how to convert any string to lower case taking at account locale. In almost all cases it produces similar output string to version without locale.

// ONLINE-RUNNER:browser;

var text = 'Здравствуй! Как поживаете?';

var convertedText = text.toLocaleLowerCase();
//var convertedText = text.toLocaleLowerCase('ru-RU');
//var convertedText = text.toLocaleLowerCase(['ru-RU', 'en-US']);

console.log(convertedText);