JavaScript - remove new line characters from string

In this short article, we are going to show how to remove all new line characters from string using JavaScript.

Quick solution:

// ONLINE-RUNNER:browser;

const EXPRESSION = /\r\n|\n\r|\n|\r/g;  // expression symbols order is very important

const text = 'line-1\n' +
             'line-2\n' +
             'line-3';

const result = text.replace(EXPRESSION, ' ');

console.log(result);  // line-1 line-2 line-3

Reusable function

// ONLINE-RUNNER:browser;

const EXPRESSION = /\r\n|\n\r|\n|\r/g;  // expression symbols order is very important

const removeNewlines = (text, replacement = '') => text.replace(EXPRESSION, replacement);


// Usage example:

const text = 'line-1\n' +
             'line-2\r' +
             'line-3\r\n' +
             'line-4\n\r' +
             'line-5';

console.log(removeNewlines(text));       // line-1line-2line-3line-4line-5
console.log(removeNewlines(text, ' '));  // line-1 line-2 line-3 line-4 line-5
console.log(removeNewlines(text, '+'));  // line-1+line-2+line-3+line-4+line-5
console.log(removeNewlines(text, '/'));  // line-1/line-2/line-3/line-4/line-5

See also

1. JavaScript - string newline character

2. JavaScript - split string by new line character