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258 Sequelize claims to supports MysqL Postgresql and sqlite. Sequelize docs explain the first steps with the JavaScript ORM. initialize a database connection then a few models without worrying about primary or foreign keys sequelize Sequelize Project sequelize. title Sequelize. description Sequelize. Task sequelize. description Sequelize. deadline Sequelize. Project.Task Next create instances and persist them query the database etc. task Task.title task. 'very important task' task. .err . tasks Task. where .err . Sequelize uses promises so you can chain error and success callbacks and it all plays well with unit tests. that is pretty well documented but the Sequelize documentation only covers the basic usage. you start using Sequelize real world projects finding the right way to implement a feature gets trickier. File Structure All the examples the Sequelize documentation show all model declarations grouped a single file. a project reaches production size is not a viable approach. alternative is to models from a module using sequelize.. problem is that relationships rely on several models. you declare a relationship models from both sides of the relationship must already be imported. should not model files from other model files because of Node. module caching policy more on that later on instead you can define relationships a standalone file. is the file structure we sequelize config PhoneNumber Task User t have to repeat the Sequelize initialization. models require User models. user User. first_name last_name The problem is when you require the modelsindex. file Node may use a cached version of the module... not From nodejs. Multiple calls to require may not cause the module code to be executed multiple times. ... Modules are cached based on their resolved filename. modules may resolve to a different filename based on the location of the calling module loading from node_modules folders it is not a guarantee that require will always the exact same object