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Asked: 2026-05-23T14:19:54+00:00

I am getting SyntaxError: Unexpected token ILLEGAL from Google Chrome and Unterminated string constant

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I am getting “SyntaxError: Unexpected token ILLEGAL” from Google Chrome and “Unterminated string constant” from IE9 (both are reported as ParserErrors) when I receive the result of an ajax request through jQuery. This function works fine in Firefox.

The result in Chrome from Webkit dev tools is:

"{"LoginResult":{"ErrorMessage":null,"Succeeded":true,"SuccessMessage":null,"AuthToken":"504F4DB7C9C5599AFDE10BBE6B147338042378C5AA2B6F6FE832C29914AD8011161917D496FA037807CCF70D9324B57C56D13C666105DDF7A9A4D3E4D3B20186008D423A31CC4D752DB281A723C726BFADBAA1EDA0F1B878EA9A23DD14A21168CFC5F01122479AA4C95917C477655B005E5094E200839E64F6EAF7D56845D30C08728E8E9BE1F4B503B919A88CF98321F77109D0AFC8DFD347A01BFCEBE728D31F1F1F6AFE2A4DF5675E6D03C29638CEF027DEC52D5"

The result in IE9 from IE dev tools is:

"{\"LoginResult\":{\"ErrorMessage\":null,\"Succeeded\":true,\"SuccessMessage\":null,\"AuthToken\":\"AB0FB8336925444BC679E757A8237BDBE9B379C2BE0CD81502CDAE53F78BCE6896D33A54AD8C436E6C6E61C99C631A7363EFAB260A82256508D4A5D0C5891A3F6C124577F743E802CDF3E6E3A182E4614E2670DA010731CCEE115C9DED6C73138F7D97CB8E1E77DE572026D230D1DEE4C481A69C6E22C934CC0D855E3A2E7221CF666C6682E329B82B872751F5F297126BBA545D3027271681C9AA63073E4A018A04AD8A7EEC6E065F0074AF7FE343F190A65E2FCA"

The result in Firefox from Firebug is:

"{\"LoginResult\":{\"ErrorMessage\":null,\"Succeeded\":true,\"SuccessMessage\":null,\"AuthToken\":\"B278D66AD2CCF3CC40DE4AB16D75ED691E1B63F7E93D89E351CF3AA518D4D85D5212753EB26D3CDB22BF70F6369E8CB42B9BDE8079B8B60C42BD3BE3C9FF3670892C8049B64ABB47ED4117FAED8C5F36B35C99241398232B9F5EF4AC8702F2A3984B3FE0E3E5CF5A642C7A2140EFE249EC15755D5971C49EE5F863A0C8EBE10E2973532843656A4C6A89B3E4333F55B7180C2614C92BB28E18611FAE6894DF835AF965E82F762B67B7030559B4CBE6C9DCAD38B1667D347EE44CDED5207ABF5967D947FEE1DAC788F656ACBE395444F4418979A906DA2788C02666BCB1002EE3\"}}"

As you can see, for this particular request, the responseText of the jquery ajax call seems to be truncated at that point in the authToken for Chrome and IE, although I don’t know why as they are all just hex chars.

The function works on the server side, it is just the result once it gets to the client side that is the issue.

I use a common ajax request function, that passes parameters in order to create the request.

These are the important parameters.

  • async: true
  • method: “GET”
  • data: {}
  • serviceUrl: “ServiceName.svc/Login?username=user.name&password=dev&rememberMe=false”

The following is my ajax call code:

$.ajax({
    async: async,
    cache: false, // don't cache results
    type: method,
    url: Lib.Services.baseUrl + serviceUrl,
    contentType: "application/json; charset=utf-8",
    data: data,
    dataType: "json",
    processData: false, // data processing is done by ourselves beforehand
    success: function (data, statusText, request) {

        if (data !== null && data !== {}) {
            if (data.d && data.d.__type) {
                data = data.d;
            }
            else {

                var keys = [];
                for (key in data) {
                    if (data.hasOwnProperty(key)) {
                        keys.push(key);
                    }
                }
                if (keys.length !== 1) {

                }
                else {
                    // Wrapped message: return first property
                    $.each(data, function (name, value) {
                        data = value;
                        return false;
                    });
                }

            }
        }

        if (data === null) {
            window.location = "/login";
        }
        else {
            successHandler(data, statusText, request);
        }

    },
    error: function (request, statusText, error) {
        var res = request.responseText;

        if (request.status !== 200) {
            if (!request.isResolved()) {
                if (request.status === 0 && Lib.debug) {
                    Lib.ShowError("Debug: Check solution is running");
                }
                else {
                    Lib.ShowError(request.status + " " + error);
                }
            }
            else {
                Lib.ShowError("Request could not be resolved.");
            }
        }
        else {
            Lib.ShowError("Unknown error status.");
        }

        if (typeof (errorHandler) === "function") {
            errorHandler();
        }

    }
});

When I run this call, the “Unknown error status” message is shown.

I have searched and viewed numerous posts about this message, but the issue typically seems to be with the request, rather than the result.

Does anyone have any clues as to what might be causing this? It seems to be happening for all my web service requests (for example, in Chrome, the responseText of another of my services is just "{"GetStatusDat")

The method responses are typical Wrapped WCF responses, with request and response type of Json.

Browsers: Firefox 5.0 | Chrome 12.0.742.112 | IE9 9.0.8112.16421: Update versions 9.0.1

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1 Answer

  1. Editorial Team

    I discovered what the issue was.

    I remembered that I had enabled the RadCompressionModule from Telerik in web.config:

    <httpModules>
    <add name="RadCompression" type="Telerik.Web.UI.RadCompression" />
</httpModules>

    This seems to interfere with (i.e. compress) the JSON returns of any web service call in a way that only Firefox can deal with. Strangely, Internet Explorer 6 was fine with it, but I have a feeling that the compression module is disabled for IE6.

    If anyone has any ideas for getting the two working together, they would be greatly appreciated.

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