two array input into object in nodejs

You can use bulk insert bulk insert

var dataArray = [];
var isiseat = [
            [
                { x: 0, y: 0, val: 1 },
                { x: 1, y: 0, val: 1 },
                { x: 2, y: 0, val: 1 }
            ],
            [
                { x: 0, y: 1, val: 1 },
                { x: 1, y: 1, val: 1 },
                { x: 2, y: 1, val: 1 }
            ],
            [
                { x: 0, y: 2, val: 1 },
                { x: 1, y: 2, val: 1 },
                { x: 2, y: 2, val: 1 }
            ]
        ]
var bulk = db.items.initializeUnorderedBulkOp();
isiseat.forEach((item1) => {
    item1.forEach((item2) => {
        var detaildata = {};
        detaildata.x = item2.x
        detaildata.y = item2.y
        detaildata.val = item2.val
        detaildata.no_anggota = 'ZZZ'
        detaildata.nama_lahir = 'ZZZ'
        detaildata.tgl_lahir = 'ZZZ'
        detaildata.jadwal = 'sssss'
        detaildata.section = 'sssssss'
        bulk.insert(detaildata);
    })
});
bulk.execute();

my saved data look like this

    {
    "_id" : ObjectId("5b61aab063727f69dc5ad1b8"),
    "x" : 0.0,
    "y" : 0.0,
    "val" : 1.0,
    "no_anggota" : "ZZZ",
    "nama_lahir" : "ZZZ",
    "tgl_lahir" : "ZZZ",
    "jadwal" : "sssss",
    "section" : "sssssss"
}

{
    "_id" : ObjectId("5b61aab063727f69dc5ad1b9"),
    "x" : 1.0,
    "y" : 0.0,
    "val" : 1.0,
    "no_anggota" : "ZZZ",
    "nama_lahir" : "ZZZ",
    "tgl_lahir" : "ZZZ",
    "jadwal" : "sssss",
    "section" : "sssssss"
}

If both isiseat and isiuser arrays are of the same length, you can pass the index parameter to the forEach function. (See "Loop through an two arrays simultaneously")

Therefore you could pass the index to your first forEach function:

// Index passed here
isiseat.forEach((item1, index) => {
  item1.forEach((item2) => {
    var detaildata = {
      x: item2.x,
      y: item2.y,
      val: item2.val,
      // ...And then access the `isiuser` array accordingly 
      no_anggota: isiuser[index].no_anggota,
      nama_lahir: isiuser[index].nama_lahir,
      tgl_lahir: isiuser[index].tgl_lahir,
      jadwal: req.body.jadwal,
      section: req.body.section
    };
    // console.log to see results
    console.log(detaildata)
    var savedata = new DetailBooking(detaildata);
    savedata.save()
  })
});