JavaScript provides two helpful functions for converting text to uppercase and lowercase.

• String.toLowerCase() converts a string to lowercase
• String.toUpperCase() converts a string to uppercase.

var text = 'Hello Poopcoder!';

// returns 'hello poopcoder!'
var lower = text.toLowerCase();

// returns 'HELLO POOPCODER!'
var upper = text.toUpperCase();

Both methods works in all modern browsers.