{  "type" : "object",  

"additionalProperties" : false,  

"properties" : {  

"key1" : {"type": "string" },  

"key2" : {"type": "string" }  },  

"required" : ["key1"] }

{ "type" : "object", 

"properties" : { 

"key1" : {"type": "object" }, 

"key2" : {"type": "array" } }, 

"required" : ["key1"] }

{  "additionalProperties" : false,  

"properties" : { 

 "key1" : {"type": "string" },  

"key2" : {"type": "string" }  } }

{  "type" : "object",  

"properties" : {  

"key1" : {"type": "string" }, 

 "key2" : {"type": "number" }  }, 

 "required" : ["key1", "key2"] }

 "properties" : {  

"key1" : {"type": "string" },  

"key2" : {"type": "string" }  },  

"required" : ["key3"] }