How to Remove all Line Breaks from a String in JavaScript

Remove all Line Breaks from a String in JavaScript #

Use the String.replace() method to remove all line breaks from a string, e.g. str.replace(/[\r\n]/gm, '');. The replace() method will remove all line breaks from the string by replacing them with an empty string.

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const str = 'a\n multi \n line \r string \n!';

const withoutLineBreaks = str.replace(/[\r\n]/gm, '');
console.log(withoutLineBreaks); // 👉️ a multi line string !

We passed a regular expression to the String.replace method.

Let's first cover the g and m flags at the end of the regex.

The g (global) flag is used to specify that we want to match all occurrences of the regex, and not just the first occurrence.

The m (multiline) flag is used to specify that we want to match occurrences over multiple lines.

The square brackets [] are called a character class and are used to match either of the characters between the brackets.

We want to replace both \r and \n because line breaks vary depending on the operating system.

The second parameter we passed to the String.replace method is the replacement for each match.

Copied!
const str = 'a\n multi \n line \r string \n!';

const withoutLineBreaks = str.replace(/[\r\n]/gm, '');
console.log(withoutLineBreaks); // 👉️ a multi line string !

For our purposes, we replace each occurrence of a line break with an empty string.

The String.replace() method doesn't mutate the original string, it returns a new string. Strings are immutable in JavaScript.

Further Reading #

• Remove all Spaces from a String in JavaScript
• Replace all Numbers in a String using JavaScript
• Remove all Numbers from a String in JavaScript
• Remove Empty Strings from an Array in JavaScript
• Remove Empty String Values from an Object in JavaScript
• How to compare Strings in JavaScript
• How to get the Length of a String in JavaScript
• Check if Array contains Empty String in JavaScript
• Interpolate Variable in a String in JavaScript
• Check if letter in String is Uppercase or Lowercase in JS
• Check if String contains only Letters and Spaces in JS
• Check if String contains only Letters and Numbers in JS
• Remove all non-alphanumeric Characters from String in JS