JavaScript String Reference
Complete String Reference
Revised July 2025
| Name | Description |
|---|---|
| at() | Returns an indexed character from a string |
| charAt() | Returns the character at a specified index (position) |
| charCodeAt() | Returns the Unicode of the character at a specified index |
| codePointAt() | Returns the Unicode value at an index (position) in a string |
| concat() | Returns two or more joined strings |
| constructor | Returns the string's constructor function |
| endsWith() | Returns if a string ends with a specified value |
| fromCharCode() | Returns Unicode values as characters |
| includes() | Returns if a string contains a specified value |
| indexOf() | Returns the index (position) of the first occurrence of a value in a string |
| isWellFormed() | Returns true if a string is well formed |
| lastIndexOf() | Returns the index (position) of the last occurrence of a value in a string |
| length | Returns the length of a string |
| localeCompare() | Compares two strings in the current locale |
| match() | Searches a string for a value, or a regular expression, and returns the matches |
| padEnd() | Pads a string at the end |
| padStart() | Pads a string from the start |
| prototype | Allows you to add properties and methods to an object |
| repeat() | Returns a new string with a number of copies of a string |
| replace() | Searches a string for a pattern, and returns a string where the first match is replaced |
| replaceAll() | Searches a string for a pattern and returns a new string where all matches are replaced |
| search() | Searches a string for a value, or regular expression, and returns the index (position) of the match |
| slice() | Extracts a part of a string and returns a new string |
| split() | Splits a string into an array of substrings |
| startsWith() | Checks whether a string begins with specified characters |
| substr() | Deprecated. Use substring() or slice() instead. |
| substring() | Extracts characters from a string, between two specified indices (positions) |
| toLocaleLowerCase() | Returns a string converted to lowercase letters, using the host's locale |
| toLocaleUpperCase() | Returns a string converted to uppercase letters, using the host's locale |
| toLowerCase() | Returns a string converted to lowercase letters |
| toString() | Returns a string or a string object as a string |
| toUpperCase() | Returns a string converted to uppercase letters |
| toWellFormed() | returns a string where "lone surrogates" are replaced with the Unicode replacement character |
| trim() | Returns a string with removed whitespaces |
| trimEnd() | Returns a string with removed whitespaces from the end |
| trimStart() | Returns a string with removed whitespaces from the start |
| valueOf() | Returns the primitive value of a string or a string object |
Note
All string methods return a new value.
They do not change the original string.
String HTML Wrapper Methods
HTML wrapper methods return a string wrapped inside an HTML tag.
These are not standard methods, and may not work as expected.
The HTML wrapper methods are deprecated in JavaScript.
They are only standardized for compatibility purposes and are not recommended for new development.
Modern web development practices advocate for using CSS for styling and DOM manipulation to create and modify HTML elements, providing greater control and flexibility.
| Method | Description |
|---|---|
| anchor() | Displays a string as an anchor |
| big() | Displays a string using a big font |
| blink() | Displays a blinking string |
| bold() | Displays a string in bold |
| fixed() | Displays a string using a fixed-pitch font |
| fontcolor() | Displays a string using a specified color |
| fontsize() | Displays a string using a specified size |
| italics() | Displays a string in italic |
| link() | Displays a string as a hyperlink |
| small() | Displays a string using a small font |
| strike() | Displays a string with a strikethrough |
| sub() | Displays a string as subscript text |
| sup() | Displays a string as superscript text |
Complete JavaScript Reference
For a complete reference to all JavaScript properties and methods, with full descriptions and many examples, go to:
W3Schools' Full JavaScript Reference.
The reference inludes all JavaScript updates from 1999 to 2025.
