Strange encoding of client.fields when accessing from api.

[ghost]

I'm trying to get POST data from client.fields property and getting such string which cannot be parsed with JSON.parse:
{ '{"0":{"value":"alega","path":"services.list.1.0.header"},"1":{"value":"agafonov ': '',
'nbsp;","path":"services.list.1.1.header"}}': '' }
while client.data of the same post gives: {"0":{"value":"alega","path":"services.list.1.0.header"},"1":{"value":"agafonov  ","path":"services.list.1.1.header"}}
which is ok for the parser.

[tshemsedinov]

This example works well:
Client side example:

$(document).on('click', '#menuPostJSON', function() {
    var parameterName = 'paramaterValue';
    panelCenter.empty().html('<div class="progress"></div>');
    $.post(
        '/examples/simple/jsonPost.json',
        { parameterName: parameterName },
        function(res) {
            panelCenter.html('<pre>'+JSON.stringify(res, null, 2)+'</pre>');
        }
    );
});

Server side handler:

module.exports = function(client, callback) {
    application.requestCounter = application.requestCounter || 0;
    console.dir(client.fields);
    callback({
        status: 1,
        parameterValue: client.fields.parameterName,
        valueLength:    client.fields.parameterName.length,
        requestCounter: application.requestCounter++
    });
}

Server console output:

{ parameterName: 'paramaterValue' }