ExpressJS vs TypeORM: What are the differences?

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1. Database Integration: ExpressJS is a web application framework for Node.js, while TypeORM is an Object-Relational Mapping (ORM) library that helps with database integration. ExpressJS does not directly handle database operations but provides flexibility to work with any database. In contrast, TypeORM is specifically designed to simplify database interactions with a focus on entities, migrations, and relations.

2. Entity Management: ExpressJS primarily focuses on handling HTTP requests, routing, and middleware functions to build web applications. TypeORM excels in managing entities, defining their structure, relationships, and translating them to database tables. ExpressJS requires additional ORM libraries or custom database queries to handle database operations efficiently.

3. Metadata Handling: ExpressJS does not have built-in support for managing entity metadata as compared to TypeORM. TypeORM simplifies the process of defining metadata for entities, columns, and relations through decorators and annotations. ExpressJS developers need to manually handle metadata information for database operations.

4. Query Building: ExpressJS relies on manual query building for reading and writing data from the database, which can be error-prone and tedious for complex queries. TypeORM offers query builder methods and a query language that translates into database-specific SQL queries, making it easier to retrieve and manipulate data.

5. Schema Migration: ExpressJS does not provide built-in tools for managing database schema changes and migrations, requiring developers to handle these tasks manually. With TypeORM, schema migrations are simplified through migration scripts that handle database schema changes efficiently, ensuring data integrity and consistency across environments.

6. Entity Relationship: While ExpressJS can work with relational databases, handling complex entity relationships and database joins can be challenging. TypeORM simplifies entity relationship management through decorators and query methods, making it easier to define and navigate relationships between entities in an object-oriented manner.

In Summary, ExpressJS focuses on web application development while TypeORM is a specialized ORM library for database integration with features like entity management, metadata handling, query building, schema migration, and entity relationship management.