JSON Structure for List of Objects

I would like to know, whats the right structure for a list of objects in JSON.

We are using JAXB to convert the POJO's to JSON.

Here is the choices, Please direct me what is right.

foos: [
             foo:{..},
             foo:{..}
      ]

or

   foos : [
           {...},
           {...}
          ]

If the first structure is right, what is the JAXB annotation I should use to get the structure right.