What is TypeORM ?

• Supports both DataMapper and ActiveRecord (your choice).
• Entities and columns.
• Database-specific column types.
• Entity manager.
• Repositories and custom repositories.
• Clean object relational model.
• Associations (relations).
• Eager and lazy relations.
• Uni-directional, bi-directional and self-referenced relations.
• Supports multiple inheritance patterns.
• Cascades.
• Indices.
• Transactions.
• Migrations and automatic migrations generation.
• Connection pooling.
• Replication.
• Using multiple database instances.
• Working with multiple databases types.
• Cross-database and cross-schema queries.
• Elegant-syntax, flexible and powerful QueryBuilder.
• Left and inner joins.
• Proper pagination for queries using joins.
• Query caching.
• Streaming raw results.
• Logging.
• Listeners and subscribers (hooks).
• Supports closure table pattern.
• Schema declaration in models or separate configuration files.
• Supports MySQL / MariaDB / Postgres / CockroachDB / SQLite / Microsoft SQL Server / Oracle / SAP Hana / sql.js.
• Supports MongoDB NoSQL database.
• Works in NodeJS / Browser / Ionic / Cordova / React Native / NativeScript / Expo / Electron platforms.
• TypeScript and JavaScript support.
• ESM and CommonJS support.
• Produced code is performant, flexible, clean and maintainable.
• Follows all possible best practices.
• CLI.

Open source and free