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install sequelize cli

npm install --save-dev sequelize-cli

sequelize installation

$ npm i sequelize # This will install v6

# And one of the following:
$ npm i pg pg-hstore # Postgres
$ npm i mysql2
$ npm i mariadb
$ npm i sqlite3
$ npm i tedious # Microsoft SQL Server
$ npm i ibm_db #DB2

install sequelize cli

$ npm install --save sequelize-cli

sequelize install in nodejs

$ npm install --save sequelize