how to query that a hash contains a key?

I can't find anything that illuminates my problem.

Given data:

{
"Origin": "CreateRoute",
"DestinationCidrBlock": "10.12.160.0/20",
"State": "active",
"VpcPeeringConnectionId": "pcx-851234ed"
},
{
"Origin": "CreateRoute",
"DestinationCidrBlock": "10.13.176.0/20",
"State": "active",
"VpcPeeringConnectionId": "pcx-bdffffd5"
},
{
"GatewayId": "vgw-0a12ab63",
"DestinationCidrBlock": "10.0.0.0/8",
"State": "active",
"Origin": "CreateRoute"
},
{
"Origin": "CreateRoute",
"DestinationCidrBlock": "0.0.0.0/0",
"NatGatewayId": "nat-0e902b64123458915",
"State": "active"
},

how do I query to pick only the hashes that contain the key 'VpcPeeringConnectionId'?