toUpperCase() is an ECMAScript1 (JavaScript 1997) feature. It is supported in all browsers:

Mar 13, 2025 · The toUpperCase() method returns the value of the string converted to uppercase. This method does not affect the value of the string itself since JavaScript strings are immutable. This method will convert any non-string value to a string, when …

Jun 22, 2009 · How do I make the first character of a string uppercase if it's a letter, but not change the case of any of the other letters? For example: Underscore has a plugin called underscore.string that includes this and a bunch of other great tools.

Mar 7, 2025 · Using charAt () with slice () Method (Most Common) The combination of charAt () and slice () is the simplest and widely used way to capitalize the first letter of a string. charAt (0): Extracts the first character of the string. toUpperCase (): Converts the first character to uppercase.

Aug 26, 2020 · In JavaScript, we have a method called toUpperCase(), which we can call on strings, or words. As we can imply from the name, you call it on a string/word, and it is going to return the same thing but as an uppercase.

Sep 17, 2021 · The built-in way of capitalizing strings in JavaScript is using the toUpperCase() function, which capitalizes the whole string. let string = 'masteringjs.io' string.toUpperCase(); // MASTERINGJS.IO Capitalizing the First Letter. To capitalize the first letter, the …

Nov 13, 2020 · To capitalize a string in Javascript so the first character is in uppercase, we don't need to add another NPM dependency. We can use plain JavaScript or even CSS if it is solely for presentational purposes. Let's see how we can approach this through a couple of common JavaScript functions.

Read this JavaScript tutorial and learn the methods and undertake some steps which will help you make the first letter in the string uppercase easily.

Dec 6, 2020 · JavaScript’s toUpperCase() method converts a string object into a new string consisting of the contents of the first string, with all alphabetic characters converted to be upper-case (i.e. capitalized).

To capitalize words in JavaScript, developers can use the built-in string method toUpperCase(). By combining toUpperCase() with other string manipulation methods such as charAt() and slice(), developers can effortlessly capitalize the first letter of each word in a given string.