create JSON objects from input stream

Question

I am trying to read a really big file (4> GB) which has more than million records and create JSON objects from them. since file is too big I will have to stream it and create JSON objects on the go. I am using ijson. here is my code sample.

import ijson

file_name = "test-json1.json"
parser = ijson.parse(open(file_name))
for prefix, event, value in parser:
    #if prefix.endswith('.Event') and event == 'map_key':
    #    print "start"
    if prefix.endswith('.Event') and event == "end_map":
        print "end" #create json object and save it to database.

now here I am stuck. How can I create individual JSON objects at the event == "end_map" so I can send that object to save it to database?