concatenating two json strings

Hi there,
I have two json strings that I want to concatenate and produce a valid json.
The first one looks like this.
{
    "from": "2008",
    "to": "2015"
}

And the second one looks like:
{
    "members": [
        {
            "firstName": "Johnson",
            "lastName": "David"
        },
       {
            "firstName": "Steve",
            "lastName": "Watson"
        },
       {
            "firstName": "Caroline",
            "lastName": "Renolds"
        }
]
}
How can I concatenate these two?
I tried  
jsonOne.concat(jsonSecond);

but, it seems to produce the following which is not a valid json.  I tried this in http://jsonlint.com/ and it fails as well.  


{
    "from": "2008",
    "to": "2015"
}
{
    "members": [
        {
            "firstName": "Johnson",
            "lastName": "David"
        },
       {
            "firstName": "Steve",
            "lastName": "Watson"
        },
       {
            "firstName": "Caroline",
            "lastName": "Renolds"
        }
]
}
ambuliAsked:
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RobOwner (Aidellio)Commented:
you need to encapsulate in an outer object.  This is one way: http://jsbin.com/nihuca/1/edit?js,console

var jsonone = '{"from": "2008",  "to": "2015"}';

var jsontwo = '{  "members": [    {      "firstName": "Johnson",      "lastName": "David"    },    {      "firstName": "Steve",      "lastName": "Watson"    },    {      "firstName": "Caroline",      "lastName": "Renolds"    }  ]}';

var j1 = JSON.parse(jsonone);
var j2 = JSON.parse(jsontwo);

var combined = {
  "j1": j1,
  "j2": j2
};

console.log(JSON.stringify(combined));

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