title: How to add variables in json file?
body: <p>Below is json file. I want to use variables for db password and db username. How can I add a variable in json ?</p>
  
  <pre><code>{
    "name" : "mydb3",
    "storage" : {
      "binaryStorage" : {
        "type"  : "database",
        "driverClass" : "com.mysql.jdbc.Driver",
        "url" : "$jdbcdburl",
        "username" : "$jdbcusername",
        "password" : "$jdbcpassword"
      }
    },
    "workspaces" : {
      "default" : "default",
      "allowCreation" : true
    }
  }
  </code></pre>