Adding base64 string to JSON invalidates it - json

Question

I am creating a JSON Array having a byte64 string data. This is an invalid JSON but when I remove the displaypic value by some normal string the JSON is valid. Please help me with this. Is there any other way to work with images that has to be parsed on cross platforms. How do I deal with this byte 64 string.
It's a long data so can't add here.. The body limit is 30000. Please see this link for the JSON.
CODE THAT CREATES JSON
function checkLogin_post()
{
//$responsedata = array();
if($this->post('useremail') && $this->post('password'))
{
$useremail = $this->post('useremail');
$password = $this->post('password');
$this->load->model('loginmodel');
$table_data = $this->loginmodel->checkLogin($useremail);
if (sizeof($table_data) != 0)
{
foreach ($table_data as $data)
{
if($password == $data->password)
{
$responsedata["firstname"] = $data->firstname;
$responsedata["lastname"] = $data->lastname;
$responsedata["email"] = $data->email;
$responsedata["userid"] = $data->userid;
$responsedata["displaypic"] = $data->displaypic; //THIS IS THE BASE64
$responsedata["ispersonaldetailsfilled"] = $data->ispersonaldetailsfilled;
$responsedata["isexpertisedetailsfilled"] = $data->isexpertisedetailsfilled;
$responsedata["isprofessionaldetailsfilled"] = $data->isprofessionaldetailsfilled;
$this->response(array("success"=>$responsedata), 200);
//$this->response($responsedata, 200);
}
else
{
$this->response(array("error"=>"Password not matched"), 200);
}
}
}
else
{
$this->response(array("error"=>"User not found"), 200);
}
}
else
{
if($this->post('useremail') == "")
{
$this->response(array("error"=>"Useremail can't be null"),200);
}
if($this->post('password') == "")
{
$this->response(array("error"=>"Password can't be null"),200);
}
}
}

Answer 1

It was just missing a brace at the end. Here's your corrected JSON
Always use tools to validate your json before posting a question. I personally like http://pro.jsonlint.com