JavaScript Convert String to Uppercase
To convert a string to uppercase in JavaScript, call toUpperCase() method on the string. The expression returns a new string with all the characters of the calling string transformed to uppercase.
Syntax
The syntax to call toUpperCase()
function on the string str
is
str.toUpperCase()
toUpperCase() returns a new string with the contents of the original string transformed to uppercase.
Examples
In the following example, we take a string str
, convert this string to uppercase, and display both the original string, and uppercase transformed string in #output.
index.html
<!DOCTYPE html> <html lang="en"> <body> <pre id="output"></pre> <script> var str = 'hello world'; var result = str.toUpperCase(); var output = 'Original string : ' + str; output += '\n\nUppercase string : ' + result; document.getElementById('output').innerHTML = output; </script> </body> </html>
Conclusion
In this JavaScript Tutorial, we learned how to transform a given string to uppercase in JavaScript, using toUpperCase() method, with examples.