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Editorial Team
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Asked: 2026-05-27T03:29:35+00:00

I started getting errors in my browser, parsing JSON return data from the server.

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I started getting errors in my browser, parsing JSON return data from the server. At first I thought it is something specific to my data, but even something silly like

{"a": 1}

results in the error “invalid label” in Firefox and “SyntaxError: Unexpected token :” in Chrome. When changing it to

{a:1}

(i.e. removing the double quote around the label) it works fine. However, I am sure that even with the double quotes, it is valid JSON (and JSONLint agrees with this).

The workaround I have seen is to surround the JSON object with brackets like so:

({"a":1})

and this works from the browser console, but not when I change my server data (which is responding to a JSONP call) and I can’t change it in the browser either, because I am using a library (Dojo) and I don’t have the opportunity to intercept the return data before it is parsed.

UPDATE

I found a bug in my server code where I am not wrapping the data in a JS function for the JSONP response. This has fixed the problem, and I subsequently need to delete this question. Apologies, and thanks for the responses though.

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1 Answer

  1. Editorial Team
    {"a": 1}

    standing alone is not json, it’s a block.

    Where "a": would be a jump label for continue. And such labels are written without ".

    Whereas ({"a":1}) is an expression. And as such {"a": 1} will get parsed as json.

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