How to save an array of object in mongo db using mongoose

giving an array of object below:

myarray: [ '{"id":"id1","ts":"ts1","lat":"lat1","lon":"lon1"}',
  '{"id":"id2","ts":"ts2","lat":"lat2","lon":"lon2"}',
  '{"id":"id3","ts":"ts3","lat":"lat3","lon":"lon3"}' ]

I want to save it in mongo database by using mongoose, this is my code:

for(var obj in myarray){
       var doc = new MyCollection(myarray[obj])
        sigfoxData.save()
                  .catch((err=>{console.log(error.message);}))
            }

But I get this error when executing the code:

TypeError: Cannot use 'in' operator to search for '_id' in {"id":"id1","ts":"ts1","lat":"lat1","lon":"lon1"}

I don't find the source of the error. Can you help me please?

via Blackhat