In JavaScript, you can convert a string to uppercase using the toUpperCase() method, which is available on string objects. This method returns a new string with all alphabetic characters converted to uppercase.
Syntax:
string.toUpperCase()-
string: The string that you want to convert to uppercase.
Example: Here, the toUpperCase() method is called on the str string, converting all lowercase letters to uppercase. The resulting string, "HELLO WORLD", is assigned to the variable upperStr.
Javascript
const str = "hello world";
const upperStr = str.toUpperCase();console.log(upperStr); // Output: "HELLO WORLD"
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Output
HELLO WORLD