JavaScript string newline character?

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Is \n the universal newline character sequence in Javascript for all platforms? If not, how do I determine the character for the current environment?

I'm not asking about the HTML newline element (<BR/>). I'm asking about the newline character sequence used within JavaScript strings.

I've just tested a few browsers using this silly bit of JavaScript:

function log_newline(msg, test_value) {
  if (!test_value) { 
    test_value = document.getElementById('test').value;
  }
  console.log(msg + ': ' + (test_value.match(/\r/) ? 'CR' : '')
              + ' ' + (test_value.match(/\n/) ? 'LF' : ''));
}

log_newline('HTML source');
log_newline('JS string', "foo\nbar");
log_newline('JS template literal', `bar
baz`);
<textarea id="test" name="test">

</textarea>

JavaScript string newline character?, The reason it is not working is because javascript strings must be terminated before the next newline character (not a \n obviously). The reason  The Newline Character . To keep long concatenation output readable, JavaScript provides two ways to create line breaks within your string. The first is the newline character ( ). The newline character creates line breaks within the output of a string, be it simply text or JavaScript-generated HTML.

Yes, it is universal.

Although '\n' is the universal newline characters, you have to keep in mind that, depending on your input, new line characters might be preceded by carriage return characters ('\r').

JavaScript string with new line - but not using \n, Since you use innerHTML you can use HTML < br /> for line breaks. If you want a line break in JS (for example if you use window.alert()) you  Is the universal newline character sequence in Javascript for all platforms? If not, how do I determine the character for the current environment? I'm not asking about the HTML newline element (<BR/>). I'm asking about the newline character sequence used within JavaScript strings.

Don't use "\n". Just try this:

var string = "this\
is a multi\
line\
string";

Just enter a back-slash and keep on truckin'! Works like a charm.

JavaScript Strings, In javascript I read value hidden field and show in alert.How i break and check in debug mode '\n' not convert into special character . is one way to split a string, but how do I join it back with newlines? Also, I wonder if I is say linux which uses whichever newline character, then switch to windows, won't my web app break? The newlines become not recognized? Or maybe the browser does some conversion?

It might be easiest to just handle all cases of the new line character instead of checking which case then applying it. For example, if you need to replace the newline then do the following:

htmlstring = stringContainingNewLines.replace(/(\r\n|\n|\r)/gm, "<br>");

How to add new line in string?, How do I add a new line to a string? JavaScript Add String Newline Character Example: br tag is used to add the break line between the array elements. The above function will add breakline in after each element of array. It adds the br tag after the array element & appends it to the paragraph with id “output”.

yes use \n, unless you are generating html code, in which you want to use <br />

New line in text in javascript alert(\n is not working also <br />), returns the position where the newline character was found. If no match is found, it returns -1. Because strings must be written within quotes, JavaScript will misunderstand this string: var x = "We are the so-called "Vikings" from the north."; The string will be chopped to "We are the so-called ". The solution to avoid this problem, is to use the backslash escape character.

How do I create a new line in Javascript?, Multi-line JavaScript strings can be created by adding a backslash at the The JavaScript language performs automatic semicolon insertion at However, the spec does specify (ha!) that the newline is *not* a valid character  String literals (denoted by double or single quotes) and strings returned from String calls in a non-constructor context (that is, called without using the new keyword) are primitive strings. JavaScript automatically converts primitives to String objects, so that it's possible to use String object methods for primitive strings.

Adding a Newline Character to a String in Java, Languages » HTML Pages with CSS and JavaScript It's because newline characters are normally interpreted by HTML as spaces. If I remember correctly​, you can't send html tags in a stringbuilder, they're not being  Regular Expression: This method uses regular expressions to detect and replace newlines in the string. It is fed into replace function along with string to replace with, which in our case is an empty string. String.replace( regex / substr, replace with) The regular expression to cover all types of newlines is /\r | |\r/gm

JavaScript RegExp \n Metacharacter, In many cases, there is a need to add a new line to a string to format the output. Let's discuss how to use newline characters. Further reading:  The replace () method searches a string for a specified value, or a regular expression, and returns a new string where the specified values are replaced. Note: If you are replacing a value (and not a regular expression ), only the first instance of the value will be replaced. To replace all occurrences of a specified value, use the global (g

Comments
  • I have a multiline input control where the user is expected to enter a newline separated list. I need to parse the list by first splitting the string on newlines.
  • @landon9720: For my multiline input controls, I have a getValue function that takes the value and returns value.replace(/\r\n/g,'\n') - just to keep the output consistent across browsers/platforms.
  • Good question especially for those who are new to programming! Outside of HTML and in JavaScript it is good to know how to break to the next/new line.
  • Checkout npmjs.com/package/eol
  • Worked for me, had to use global flag though: /\r\n|\r|\n/g
  • @Edson and wrong, since it will treat \r\n as two newlines instead of one. If you want short, /\r?\n/g will probably do (who still uses Mac OS 9 anyway?).
  • Given that the SitePoint article is from 2004, the information there may not be relevant to current JS implementations.
  • Match is supposedly much faster than split: jsperf.com/regex-split-vs-match
  • This seems like overkill, see my answer below for a simpler solution!
  • \n is the universal line feed character (LF). The exact newline byte sequence depends on the platform (\r\n, \n, or \r: en.wikipedia.org/wiki/Newline). And that's the question landon is asking. You're contradicting yourself when you first say it's the universal newline character, and then say it may be preceded by a CR. Which one is it?
  • \n is the newline(line feed) character, even if it is preceded by a carriage return. CR should never be used on its own, although most Windows apis and apps will parse it as a newline. LF works just as well in Windows too. CR is just an artifact from the time when computers were merely electronic typewriters.