How to make Sequelize OR query with Node.js?

To make Sequelize OR query with Node.js, we call findAll with an object with the where property.

For instance, we write

Post.findAll({
  where: {
    authorId: {
      [Op.or]: [12, 13],
    },
  },
});

to call findAll with an object to query the Post items with authorId equal to 12 or 13, which is

SELECT * FROM post WHERE authorId = 12 OR authorId = 13;