When comparing Sequelize vs MikroORM, the Slant community recommends MikroORM for most people. In the question“What are the best JavaScript ORMs?” MikroORM is ranked 3rd while Sequelize is ranked 5th. The most important reason people chose MikroORM is:
MikroORM allows handling transactions automatically. When you call em.flush(), all computed changes are wrapped inside a database transaction.
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Pros
Pro Compatible with MSSQL
Sequelize has an offical MSSQL dialect for interacting with MSSQL databases.
Pro Implicit Transactions
MikroORM allows handling transactions automatically. When you call em.flush(), all computed changes are wrapped inside a database transaction.
Pro Powered by Unit of Work and Identity Map
Manages in memory state of loaded entities for you.
Pro DRY Entities
Uses source code analysis so you do not have to repeat yourself when defining entities. Simply define correct TypeScript types and you are good to go!
Pro Allows multiple ways to define entities
You can use decorators or define your schema via EntitySchema helper. You can also define custom MetadataProvider to customize how the discovery works.
Pro Easy-to-use and convinient way to use it
The first easy-to-use and convinient ORM in Typescript for Node.js
Pro SQL layer built on top of Knex
Allows to use knex directly (as well as native SQL) and map results to entities easily.
Pro Supports both SQL and NoSQL
Supports MongoDB, MySQL, MariaDB, PostgreSQL and SQLite databases, and more can be supported via custom drivers right now.
Pro EntityGenerator
Allow to generate entities from existing database schema to get you up in speed.