create json object in specific format

create json object in specific format

i want to write a script by which i can generate the json like in below
format.
[
[ "20 aug 2013",
[
{lbl1: "Titanium Card",lbl2: "$2000",lbl3:
"$400",img1234:"checkboxwhite.png"},
{lbl1: "Gold Card",lbl2: "$1000",lbl3:
"$500",img1234:"checkboxwhite.png"},
{lbl1: "Silver Card",lbl2: "$800",lbl3:
"$600",img1234:"checkboxwhite.png"}
]
],
[ "22 aug 2013",
[
{lbl1:"Savings 1", lbl2:
"$400",lbl3:"N/A",img1234:"checkboxwhite.png"},
{lbl1: "Savings 2", lbl2: "$400",lbl3:
"N/A",img1234:"checkboxwhite.png"}
]
],
[ "24 aug 2012",
[
{lbl1: "Checking 1",lbl2: "N/A",lbl3:
"$400",img1234:"checkboxwhite.png"},
{lbl1: "Checking 2",lbl2: "N/A",lbl3:
"$400",img1234:"checkboxwhite.png"}
]
]
];
Please help
thanks in advance.