How to compare JSON which contains cyclic object

[HealthD]

Please tell me to compare JSON which contains cyclic object.As follows,return true because a1 equals a2.\[code\]a1 = {}a1.b = 1a1.c = 2a1.d = aa2 = {}a2.b = 1a2.c = 2a2.d = a2\[/code\]As follows,return false because a1 does not equal a2.\[code\]a1 = {}a1.b = 1a1.c = 2a1.d = aa2 = {}a2.b = 1a2.c = 2a2.d = a2a2.e = a2\[/code\]