http://groups.google.com/group/json-schema/msg/86a0c5ae17423919

Types as defined in this message are not supported.

The example in the message wasn't really a valid schema, it should look like: {type:[ {type:"object", properties:{name:{type:"string"}, id:{type:"integer"}}, additionalProperties:false}, {type:"object", properties:{brand:{type:"string"}, id:{type:"integer"}}, additionalProperties:false}] } Which should work in the latest version