Sequelize vs TypeORM: Which One Should I Choose?

What are the main differences between Sequelize and TypeORM?

Sequelize is a promise-based ORM for Node.js, while TypeORM is designed for TypeScript and supports both Active Record and Data Mapper patterns. Sequelize is more mature, but TypeORM offers better TypeScript support.

Which one is better for a TypeScript project?

TypeORM is generally better for TypeScript projects due to its native TypeScript support, making it easier to work with types and decorators.

Can you give me an example of how to define a model in both?

Sure! In Sequelize, you define a model like this:

const User = sequelize.define('User', {
  username: {
    type: Sequelize.STRING,
    allowNull: false
  }
});

In TypeORM, it looks like this:

@Entity()
export class User {
  @PrimaryGeneratedColumn()
  id: number;

  @Column()
  username: string;
}

What about performance? Is one faster than the other?

Performance can vary based on the use case, but generally, TypeORM may have a slight overhead due to its features. However, both are optimized for performance, so the difference might not be significant in most applications.