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Asked: 2026-06-02T07:15:46+00:00

I want to use Reflect.parse in my JavaScript in Firefox. MDN says to import

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I want to use Reflect.parse in my JavaScript in Firefox.

MDN says to import this into the global object via

Components.utils.import("resource://gre/modules/reflect.jsm")

However, this results in the following error message:

Error: Permission denied for <file://> to get property XPCComponents.utils

I have tried this in Firefox 11 and Aurora.

How can I get access to Reflect.parse?

EDIT:

The error message is due to the following fragment:

Component.utils
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1 Answer

  1. Editorial Team

    There is no real solution to this problem. The documentation on Reflect.parse in the wiki is misleading, to say the least.

    If you want a “pure” JavaScript solution in SpiderMonkey/Firefox, don’t rely on Reflect.parse.

    I see a lot of projects using the parser from Narcissus and I should have done the same.

    EDIT: The Esprima project is an excellent implementation of the Mozilla Parser API. After replacing Reflect.parse with esprima.parse all my 150+ test cases were still green, except for 5 or so dealing with non-standard SpiderMonkey extensions like let expressions (which I find pretty impressive).

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