Have you used an object-relational mapper in your projects?

Yes, in Node.js projects, an object-relational mapper (ORM) was often used for convenient database interaction. For example, popular ORMs include Sequelize, TypeORM, Prisma. They allow describing data models as classes or objects, and then automatically translate operations on these models into SQL queries.

Example using Sequelize:

const { Sequelize, DataTypes } = require('sequelize');
const sequelize = new Sequelize('sqlite::memory:');

const User = sequelize.define('User', {
  username: DataTypes.STRING,
  birthday: DataTypes.DATE
});

(async () => {
  await sequelize.sync();
  const user = await User.create({ username: 'john', birthday: new Date(1990, 1, 1) });
  console.log(user.toJSON());
})();

ORM simplifies working with the database, eliminating the need to write SQL manually and providing a convenient interface for CRUD operations.