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# Sequelize [](https://www.npmjs.com/package/sequelize) [](https://travis-ci.org/sequelize/sequelize) [](https://ci.appveyor.com/project/sushantdhiman/sequelize/branch/master) [](https://codecov.io/gh/sequelize/sequelize) [](https://www.bountysource.com/teams/sequelize/issues?utm_source=Sequelize&utm_medium=shield&utm_campaign=bounties_received) [](http://sequelize-slack.herokuapp.com/) [](https://www.npmjs.com/package/sequelize)  [](https://github.com/sequelize/sequelize/blob/master/LICENSE) [](https://github.com/semantic-release/semantic-release) [](https://greenkeeper.io/) Sequelize is a promise-based Node.js ORM for Postgres, MySQL, SQLite and Microsoft SQL Server. It features solid transaction support, relations, read replication and more. ## Table of Contents - [Installation](#installation) - [Features](#features) - [Responsible disclosure](#responsible-disclosure) - [Documentation](#documentation) - [Resources](#resources) ## Installation ```bash $ npm install --save sequelize # And one of the following: $ npm install --save pg pg-hstore $ npm install --save mysql2 $ npm install --save sqlite3 $ npm install --save tedious # MSSQL ``` Sequelize follows [SEMVER](http://semver.org). Supports Node v4 and above to use ES6 features. ## Features - Schema definition - Schema synchronization/dropping - 1:1, 1:M & N:M Associations - Through models - Promises - Hooks/callbacks/lifecycle events - Prefetching/association including - Transactions - Migrations - CLI ([sequelize-cli](https://github.com/sequelize/cli)) ## Responsible disclosure If you have any security issue to report, contact project maintainers privately. You can find contact information [here](https://github.com/sequelize/sequelize/blob/master/CONTACT.md) ## Documentation - [Contributing](https://github.com/sequelize/sequelize/blob/master/CONTRIBUTING.md) - [v4 Documentation](http://docs.sequelizejs.com) - [v3 Documentation](https://sequelize.readthedocs.io/en/v3/) - [v3 to v4 Upgrade Guide](http://docs.sequelizejs.com/manual/tutorial/upgrade-to-v4.html) ## Resources - [Changelog](https://github.com/sequelize/sequelize/releases) - [Slack](http://sequelize-slack.herokuapp.com/) - [Google Groups](https://groups.google.com/forum/#!forum/sequelize) ### Tools - [Add-ons & Plugins](https://github.com/sequelize/sequelize/wiki/Add-ons-&-Plugins) - [Sequelize & TypeScript](https://github.com/RobinBuschmann/sequelize-typescript) ### Learning - [Getting Started](http://docs.sequelizejs.com/manual/installation/getting-started) - [Express Example](https://github.com/sequelize/express-example) ### Translations - [English v4](http://docs.sequelizejs.com) (OFFICIAL) - [中文文档 v4](https://github.com/demopark/sequelize-docs-Zh-CN) (UNOFFICIAL)