trouble with express.index sending a json object

I'm using express to do a very simple page. My index.js looks like this:

exports.index = function(req, res){
  res.render(
    'index', 
        { 
            title: 'Expressssss',
            Tin: varTin,
            Tout : varTout,
            Hin : varHin,
            Tout_array : { 'date': 'Thu Mar 07 2013 22:00:04 GMT+0100 (CET)', 'value': '10062' }
        }
    );
};

On the file index.ejs I can use the values using for example <%= Tin %>... This works very well....

The problem is that data = <%= Tout_array %>; doesn't seem to work well. Using chromes console, it get an error on this line. The html code after parsing looks like this:

data = [object Object];

and the error at this point is

    Uncaught SyntaxError: Unexpected identifier

what am I doing wrong? why parsing any other variale works pretty good, but not this nested json structure? I'm using this, because I want to send a bigger array.

Thans