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Editorial Team
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Asked: 2026-05-15T03:55:30+00:00

There is a syntax error in the following code: <!DOCTYPE html> <html> <body> Hello

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There is a syntax error in the following code:

<!DOCTYPE html>
<html>
  <body>
    Hello World!
    <script type="text/javascript">
        var obj = {'a:b': '1'};
        alert(obj.a:b); // syntax error
    </script>
  </body>
</html>

So how to handle JavaScript objects with colons in key names?

I have to do this because I need to handle a feed in jsonp format from a remote server which I do not have control over, and there are colons in the key names of the returned jsonp (because the jsonp is converted from XML with namespaces in tags).

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1 Answer

  1. Editorial Team

    Access them with:

    obj['a:b']

    The brackets are synonymous with . except they accept strings (including variables!)

    So obj.x == obj['x'], and if you had a variable foo = 'x' then obj[foo] would also be equal.

    Don’t let the syntax fool you, though. It may look like syntax for array access, but it is actually another way to access properties from objects.

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