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JavaScript SyntaxError: Unterminated string literal
  • Last Updated : 23 Jul, 2020

This JavaScript error unterminated string literal occurs if there is string which is not terminated properly. String literals must be enclosed by single (‘) or double (“) quotes.

Message:

SyntaxError: Unterminated string constant (Edge)
SyntaxError: unterminated string literal (Firefox)

Error Type:

SyntaxError

What happened?

There is  a string in the code which is not terminated. String literals needs to be enclosed by single (‘) or double (“) quotes. JavaScript sees no difference between single-quoted strings and double-quoted strings.



Example 1: In this example, the single quotes are used and the string is not terminated, So the error has occurred.




<!DOCTYPE html>
<html>
<head>
<title>Syntax Error</title>
</head>
<body>
    <script>
    var GFG_str = 'This
                     is 
                     GeeksForGeeks';
    document.write(GFG_str);
    </script>
</body>
</html>

Output(In console):

SyntaxError: Unterminated string constant

Example 2: In this example, the double quotes are used and the string is not terminated, So the error has occurred.




<!DOCTYPE html>
<html>
<head>
<title>Syntax Error</title>
</head>
<body>
    <script>
    var GFG_str = "This
                     is 
                     GeeksForGeeks";
    document.write(GFG_str);
    </script>
</body>
</html>

Output(In console):

SyntaxError: Unterminated string constant
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