JSON format is a very common format for using with Javascript. WERUAT supports it because many modern web applications already use a lot of JSON.
This example should explain everything you need:
{
"format":"json",
"locations":[
{
"name":"Free firewood",
"short_name":"Wood",
"description":"A tree fell down and I have a lot of fire wood if any one would like it give me a call at 555.555.5555",
"link":"http://www.mysiteexample.com/item/123",
"address":"123 Pearchtree Circle Atlanta GA",
"icon":"http://www.mysiteexample.com/images/wood16x16.png",
},
{
"name":"Rent a caraige house",
"short_name":"$500",
"description":"Wonderfully renovated caraige house for rent please call 555.555.5555",
"link":"http://www.mysiteexample.com/item/124",
"address":"124 Pearchtree Circle Atlanta GA",
"icon":"http://www.mysiteexample.com/images/124PearchTree16x16.png"
}
]
}