JavaScript contains

To check if a string contains a specific character in Javascript, call the String. indexOf method , e.g. string. indexOf(myChar) .

Javascript check if string contains substring using includes() Javascript includes() method is used to perform a case-sensitive search to find out if a particular string is contained within another string. The includes() method returns true if the substring is found else, it will return false.

In JavaScript, includes() method determines whether a string contains the given characters within it or not . This method returns true if the string contains the characters, otherwise, it returns false.