1[{
 2        "username": "u1",
 3        "password": "u1",
 4        "email": "u1"
 5    },
 6    {
 7        "username": "u2",
 8        "password": "u2",
 9        "email": "u2"
10    },
11    {
12        "username": "u3",
13        "password": "u3",
14        "email": "u3"
15    }
16]