Javascript parse error on ‘\u2028’ unicode character

by

Yes, it’s a feature of the JavaScript language, documented in the ECMAScript standard (3rd edition section 7.3), that the U+2028 and U+2029 characters count as line endings. Consequently a JavaScript parser will treat any unencoded U+2028/9 character in the same way as a newline. Since you can’t put a newline inside a string literal, you get a syntax error.

This is an unfortunate oversight in the design of JSON: it is not actually a proper subset of JavaScript. Raw U+2028/9 characters are valid in string literals in JSON, and will be accepted by JSON.parse, but not so in JavaScript itself.

Hence it is only safe to generate JavaScript code using a JSON parser if you’re sure it explicitly \u-escapes those characters. Some do, some don’t; many \u-escape all non-ASCII characters, which avoids the problem.

More Related Contents:

  1. What is the character code for enter? [closed]
  2. Sending UTF-encoded POST request [duplicate]
  3. Concrete JavaScript regular expression for accented characters (diacritics)
  4. String length in bytes in JavaScript
  5. Javascript RegExp + Word boundaries + unicode characters
  6. utf-8 word boundary regex in javascript
  7. Decode UTF-8 with Javascript
  8. Remove zero-width space characters from a JavaScript string
  9. JavaScript strings outside of the BMP
  10. How to remove emoji code using javascript?
  11. \u200b (Zero width space) characters in my JS code. Where did they come from?
  12. How can I split a string containing emoji into an array?
  13. How to find the unicode of the subscript alphabet?
  14. Programatic Accent Reduction in JavaScript (aka text normalization or unaccenting)
  15. Insert Unicode character into JavaScript
  16. JavaScript regular expression for Unicode emoji
  17. Match any non-word character (excluding diacritics)
  18. Matching accented characters with Javascript regexes
  19. Converting punycode with dash character to Unicode
  20. Javascript unicode string, chinese character but no punctuation
  21. Javascript string comparison fails when comparing unicode characters
  22. Printing emojis with JavaScript and HTML
  23. JavaScript remove ZERO WIDTH SPACE (unicode 8203) from string
  24. Converting unicode character to string format
  25. In what JS engines, specifically, are toLowerCase & toUpperCase locale-sensitive?
  26. Regular Expression for Japanese characters
  27. Unicode string with diacritics split by chars
  28. Writing UTF8 text to file
  29. How do I fix this missing semicolon syntax error in Javascript?
  30. How to replace non-printable unicode characters (Javascript)

Leave a Comment