Normalize line endings

Angelos Chalaris · JavaScript, String, Regexp · Oct 21, 2020

Normalizes line endings in a string.

  • Use String.prototype.replace() and a regular expression to match and replace line endings with the normalized version.
  • Omit the second argument, normalized, to use the default value of '\r\n'.
const normalizeLineEndings = (str, normalized = '\r\n') =>
  str.replace(/\r?\n/g, normalized);
normalizeLineEndings('This\r\nis a\nmultiline\nstring.\r\n');
// 'This\r\nis a\r\nmultiline\r\nstring.\r\n'
normalizeLineEndings('This\r\nis a\nmultiline\nstring.\r\n', '\n');
// 'This\nis a\nmultiline\nstring.\n'

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