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toUpperCase() in JavaScript – How to Convert String to Uppercase

Whenever you use toUpperCase() on a string, the method does the following:

  1. It converts its calling string to uppercase.
  2. It returns the new version of the calling string—without changing the original string.

String toUpperCase() method's
tidbit

Use JavaScript’s toUpperCase() method to convert your string to uppercase.

Syntax of the toUpperCase() Method

Here is toUpperCase()’s syntax:

callingString.toUpperCase();

The snippet above shows that toUpperCase() does not accept any argument.

Example 1: Convert CodeSweetly to Uppercase

"CodeSweetly".toUpperCase();
// The invocation above will return: "CODESWEETLY"

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Example 2: Convert a JavaScript String to Uppercase

"friday, my friend, was born on friday".toUpperCase();
// The invocation above will return: "FRIDAY, MY FRIEND, WAS BORN ON FRIDAY"

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