To convert a Boolean value to string value in JavaScript, use the toString() method. This method returns a string of either "true" or "false" depending upon the value of the object.
Example
You can try to run the following code to convert a boolean value to string value −
<html> <head> <title>JavaScript toString() Method</title> </head> <body> <script> var flag = new Boolean(true); document.write( "flag.toString is : " + flag.toString() ); </script> </body> </html>