Insert array (of objects) into mysql database

I got working what i wanted by just doing the insert inside the 2 for-loops, but i felt like it should be better to do one insert after the loop is done.

What i tried:

1: Insert array of objects -> only inserts 1st object in array

  let itemsToDb = [];
  for (let i = 0; i < stashes.length; i++) {
    for (let j = 0; j < stashes[i].items.length; j++) {
      let item = stashes[i].items[j];
      let itemToDb = {
        item_id: item.id,
        verified: item.verified,
        icon: item.icon,
        name: item.name,
        typeline: item.typeLine,
        identified: item.identified,
        ilvl: item.ilvl,
        note: item.note,
        frametype: item.frameType,
        inventory_id: item.inventoryId,
        corrupted: item.corrupted,
        date: new Date().toJSON().slice(0, 19).replace('T', ' ')
      };
      itemsToDb.push(itemToDb);
    }
  }
  let sql = 'INSERT INTO items SET ?';
  db.query(sql, itemsToDb, (error) => {
    if (error) console.log(error);
    console.log(itemsToDb); //item added!
  });

2: Insert array of arrays -> Error (see below)

  let itemToDb = [
    item.id,
    item.verified,
    item.icon,
    item.name,
    item.typeLine,
    item.identified,
    item.ilvl,
    item.note,
    item.frameType,
    item.inventoryId,
    item.corrupted,
    new Date().toJSON().slice(0, 19).replace('T', ' ')
  ];

ER_PARSE_ERROR: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''45580327d5e9aa29bac9f4461029acd59c379006cdd622a6290ce28bff3496ee', false, 'http' at line 1

Database structure looks like this: