title: How to combine string constants and variables in JSON?
body: <p>I am having a contact form page, which sends me the email using Mandrill. I am putting the subject entered by the user in the form as the subject. But I want it to also have some constant string so that I can filter those emails. How can I do that in JSON? </p>
  
  <p>Something like in java we do concatenation - subject: "Customer Query" + subject. How can I do something similiar here?</p>
  
  <p>Code:</p>
  
  <pre><code> 'message':
    {
        'from_email': email,
        'from_name': name,
        'headers': 
         {
             'Reply-To': email
         },
        'subject': subject,
        'text': msg,
        'phone_number':phone,
        'to': [
        {
            'email':'katie1990@gmail.com',
            'name': 'Katie',
            'type': 'to'
        }]
  </code></pre>