How to write a new object to an object?

Question

Node.js

Maybe someone has come across this, how many have already written a record of objects for the first time.
I write the identifier of the new object to the obj object and there are many other objects in it, but it turns out that they are overwritten in the object and as a result something like this is obtained

'0000000000': { 217:{ data: '00000000', checksum: '2400' } }

although it should be

obj = { 250:{ 1:{ data:"001", checksum :'' }, ..., 9:{ data:"001", checksum :''  } } }

for( var i in resultArr)
            {

                if( Object.keys(obj).indexOf(resultArr[i].IMEI) == -1)
                {
                    obj[resultArr[i].IMEI] = {}
                }

                if( Object.keys(obj[resultArr[i].IMEI]).indexOf(resultArr[i].id) == -1 )
                {
                    obj[resultArr[i].IMEI][resultArr[i].id] = {}
                    obj[resultArr[i].IMEI][resultArr[i].id].data = resultArr[i].data
                    obj[resultArr[i].IMEI][resultArr[i].id].checksum = resultArr[i].checksum
                }

            }