Question 1

How to set up TypeORM with Express and TypeScript?

Accepted Answer

Install TypeORM and your database driver, create a data source configuration file, define entities with decorators like @Entity, and use repositories in Express routes. Check the sample repositories in the README for working examples.

Question 2

TypeORM vs Prisma: which is better for new projects?

Accepted Answer

TypeORM offers more flexibility with multiple databases and patterns, while Prisma provides a more modern, type-safe API with better migration tooling. Choose TypeORM for cross-database needs or architectural choice, and Prisma for simplicity and developer experience.

Question 3

How to handle many-to-many relationships in TypeORM?

Accepted Answer

Use the @ManyToMany decorator on entity properties, specify join tables with @JoinTable, and configure cascades for automatic updates. TypeORM supports eager and lazy loading to optimize data fetching.

Question 4

Can TypeORM be used with MongoDB and how does it compare to Mongoose?

Accepted Answer

Yes, TypeORM supports MongoDB with entity definitions similar to SQL databases, offering ORM features like repositories. However, Mongoose is more idiomatic for MongoDB with built-in schema validation and middleware, which TypeORM abstracts differently.

Question 5

How to optimize TypeORM query performance?

Accepted Answer

Use select queries with specific fields to reduce data transfer, leverage indexes on columns, avoid N+1 problems with joins or eager loading, and consider raw SQL for complex operations where the QueryBuilder falls short.

Question 6

What are common pitfalls with TypeORM migrations?

Accepted Answer

Migrations can fail due to incorrect SQL generation or schema drift; always review generated SQL before applying, use transactions for rollback safety, and test in staging environments to catch issues early.

TypeORM

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