How to retrieve last inserted id with Node MySQL?

To retrieve last inserted id with Node MySQL, we use the insertedId property.

For instance, we write

connection.query(
  "INSERT INTO posts SET ?",
  { title: "test" },
  (err, result, fields) => {
    if (err) throw err;

    console.log(result.insertId);
  }
);

to call query with a callback that gets the result.insertId property to get the ID of the last inserted item.