discover a Treasure Box with given information [closed]

There is competition on a website that give this information in its source code: page that give information

Given information:

{"status": "success!", "key": "mellon", "hint-1": "Pass the key to <MirzaTreasureBox>!", "hint-2": "It is on Maktabkhooneh.org!", "hint-3": "ok then, press F12 -_-"}

I should discover some thing with this information that maybe related to programming. I just could find this information on its web site source,I dont know what i need to do. Can any one help me please?