var json = {"key1":"val1","key2":"val2","key3":"val3"};
if(json.hasOwnProperty("key1")){
console.log(json["key1]);
}
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var json = {"key1":"val1","key2":"val2","key3":"val3"};
if(json.hasOwnProperty("key1")){
console.log(json["key1]);
}