jAlbum uses a json library called json-simple. Here's a usage example. Try it in jAlbum's system console:
import com.github.cliftonlabs.json_simple.*;
jsonString = '''{
"geoObjects": [
{
"name": "Summit 1",
"latlon": "36.12345, 6.123456",
},
{
"name": "Summit 2",
"latlon": "36.6789, 6.6789",
},
]
}'''
data = Jsoner.deserialize(jsonString)
data.geoObjects[0].name // Prints "Summit 1"
data.geoObjects[0].latlon // Prints "36.12345, 6.123456"