cts/Object/isPrototypeOf)
    7. [ ` Object.prototype.propertyIsEnumerable() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable)
    8. [ ` Object.prototype.toLocaleString() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/toLocaleString)
    9. [ ` Object.prototype.toString() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/toString)
    10. [ ` Object.prototype.valueOf() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/valueOf)

##  In this article

  * Try it 
  * Syntax 
  * Description 
  * Examples 
  * Specifications 
  * Browser compatibility 
  * See also 

#  String.prototype.toLowerCase()

The **` toLowerCase() ` ** method of [ ` String ` ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/String) values returns this
string converted to lower case.

##  Try it

##  Syntax

js

    
    
    toLowerCase()
    

###  Parameters

None.

###  Return value

A new string representing the calling string converted to lower case.

##  Description

The ` toLowerCase() ` method returns the value of the string converted to
lower case. ` toLowerCase() ` does not affect the value of the string ` str `
itself.

##  Examples

###  Using ` toLowerCase() `

js

    
    
    console.log("ALPHABET".toLowerCase()); // 'alphabet'
    

##  Specifications

Specification  
---  
[ ECMAScript Language Specification  
#  sec-string.prototype.tolowercase  ](https://tc39.es/ecma262/multipage/text-
processing.html#sec-string.prototype.tolowercase)  
  
##  Browser compatibility

BCD tables only load in the browser  with JavaScript enabled. Enable
JavaScript to view data.

##  See also

  * [ ` String.prototype.toLocaleLowerCase() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/toLocaleLowerCase)
  * [ ` String.prototype.toLocaleUpperCase() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/toLocaleUpperCase)
  * [ ` String.prototype.toUpperCase() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/toUpperCase)

##  Help improve MDN

Was this page helpful to you?

Yes  No

[ Learn how to contribute
](https://github.com/mdn/content/blob/main/CONTRIBUTING.md "This will take you
to our contribution guidelines on GitHub.") .

This page was last modified on  Sep 12, 2023  by  [ MDN contributors ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/String/toLowerCase/contributors.txt)
.

[ View this page on GitHub
](https://github.com/mdn/content/blob/main/files/en-
us/web/javascript/reference/global_objects/string/tolowercase/index.md?plain=1
"Folder: en-us/web/javascript/reference/global_objects/string/tolowercase
\(Opens in a new tab\)") â¢  [ Report a problem with this content
](https://github.com/mdn/content/issues/new?template=page-report.yml&mdn-
url=https%3A%2F%2Fdeveloper.mozilla.org%2Fen-
US%2Fdocs%2FWeb%2FJavaScript%2FReference%2FGlobal_Objects%2FString%2FtoLowerCase&metadata=%3C%21--+Do+not+make+changes+below+this+line+--%3E%0A%3Cdetails%3E%0A%3Csummary%3EPage+report+details%3C%2Fsummary%3E%0A%0A*+Folder%3A+%60en-
us%2Fweb%2Fjavascript%2Freference%2Fglobal_objects%2Fstring%2Ftolowercase%60%0A*+MDN+URL%3A+https%3A%2F%2Fdeveloper.mozilla.org%2Fen-
US%2Fdocs%2FWeb%2FJavaScript%2FReference%2FGlobal_Objects%2FString%2FtoLowerCase%0A*+GitHub+URL%3A+https%3A%2F%2Fgithub.com%2Fmdn%2Fcontent%2Fblob%2Fmain%2Ffiles%2Fen-
us%2Fweb%2Fjavascript%2Freference%2Fglobal_objects%2Fstring%2Ftolowercase%2Findex.md%0A*+Last+commit%3A+https%3A%2F%2Fgithub.com%2Fmdn%2Fcontent%2Fcommit%2Fc2445ce1dc3a0170e2fbfdbee10e18a7455c2282%0A*+Document+last+modified%3A+2023-09-12T02%3A17%3A31.000Z%0A%0A%3C%2Fdetails%3E
"This will take you to GitHub to file a new issue.")

[ MDN logo  ](/)

Your blueprint for a better internet.

  * [ MDN on Mastodon  ](https://mozilla.social/@mdn)
  * [ MDN on X (formerly Twitter)  ](https://twitter.com/mozdevnet)
  * [ MDN on GitHub  ](https://github.com/mdn/)
  * [ MDN Blog RSS Feed  ](/en-US/blog/rss.xml)

##  MDN

  * [ A