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Sequelize

Feature-rich ORM for modern TypeScript & JavaScript

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Sequelize is a TypeScript and Node.js ORM that maps application objects to relational databases, including Oracle, Postgres, MySQL, MariaDB, SQLite, and SQL Server. It handles data modeling, persistence, and querying, with support for transactions, associations, eager and lazy loading, and read replication.

Models are defined with data types and can be synchronized to create tables automatically. Associations such as belongsTo and hasMany let Sequelize manage related records, while soft deletion marks rows as deleted without removing them. The library also provides migrations, strong typing, JSON querying, and lifecycle events (hooks).

Sequelize is aimed at Node.js developers working with relational databases. It is installed as an npm or yarn package alongside a database driver such as sqlite3; no pricing or edition details are stated.

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