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How to convert string to upper and lowercase in JavaScript

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Converting strings to lowercase

In JavaScript, we can use the toLowerCase method to convert a string into a lowercase string. The toLowerCase method will return a new string.

var str = "UPPER Case";

var lowerCaseStr = str.toLowerCase();
console.log(lowerCaseStr);

Converting strings to uppercase

In JavaScript, we can also use the toUpperCase method to convert a string into an uppercase string. The toUpperCase method will return a new string.

var str = "uppercase";

var upperCaseStr = str.toUpperCase();
console.log(upperCaseStr);

Capitalize a string

We don’t have any in-build method to capitalize a string. However, we can implement our own method. The steps to capitalize a string are:

  • Convert the string to lowercase
  • Replace the first letter with an uppercase letter
function capitalize(str) {
  const lowerCaseString = str.toLowerCase(), // convert string to lower case  
        firstLetter = str.charAt(0).toUpperCase(), // upper case the first character
        strWithoutFirstChar = lowerCaseString.slice(1); // remove first character from lower case string 

  return firstLetter + strWithoutFirstChar; 

}

console.log(capitalize("javaScript"));
console.log(capitalize("educative.io"));

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