Client post json object for Mozilla client

I am using Mozilla fire fox

add-ons RESTClient

to test my webservices. Before that I used the method POST

by setting the header Content-Type:application/x-www-form-urlencoded

and data separated &

in the request body, eg.id=1&title=abc

But now I want the POST

object to JSON

use the same service. Examples of objects:

[
    {
         "id": 4
         "type":"alpha", 
         "title":"Title1"
    }
]

      

        
        
        
      

    

OR

[
    {
         "id": 4
         "type":"alpha", 
         "title":"Alpha"
    },
    {
         "id": 5
         "type":"beta", 
         "title":"Beta"
    },
    {
         "id": 6
         "type":"gama", 
         "title":"Gama"
    }
]

      

        
        
        
      

    

OR

[
    {
        "id": 5,
        "type":"beta", 
        "title":"Sample beta", 
        "children":[{
                "id": 6,
                "type":"betachild", 
                "title":"Beta child 1"
            },
            {
                "id": 7,
                "type":"betachild", 
                "title":"Beta child 2"
            },
            {
                "id": 8,
                "type":"betachild", 
                "title":"Beta child 3"
            }
        ]
    }
] 

      

        
        
        
      

    

OR

[
    {
        "id": 5,
        "type":"beta", 
        "title":"Sample beta", 
        "children":[{
                "id": 6,
                "type":"betachild", 
                "title":"Beta child 1"
            },
            {
                "id": 7,
                "type":"betachild", 
                "title":"Beta child 2"
            },
            {
                "id": 8,
                "type":"betachild", 
                "title":"Beta child 3"
            }
        ]
    }, 
    {
        "id": 9,
        "type":"beta", 
        "title":"Sample gama", 
        "children":[{
                "id": 10,
                "type":"gamachild", 
                "title":"Gama child 1"
            },
            {
                "id": 11,
                "type":"gamachild", 
                "title":"Gama child 2"
            },
            {
                "id": 12,
                "type":"gamachild", 
                "title":"Gama child 3"
            }
        ]
    }
] 

      

        
        
        
      

    

How do I pass this object JSON

in POST

using an RESTClient

add-in?