# use knex.js with ES6 on Node and work with .env

## The below instructions are intended for command line execution while working with node server

install dotenv and knex.js

```
npm install dotenv --save
npm install knex --save

```

In the project root directory, create a folder called 'db' and navigate to this 'db' folder:

execute the following command:

```
npx knex init

```

A 'knexfile.js' will be created in this directory.

Change the file extension to .cjs

you will need to add the below line in your package.json file:

```

"type": "module",

```

create 2 subfolders inside 'db' folder, called "migrations" and "seeds"

# data in .env file

This file should be placed in the project root directory

DEV_USER=
DEV_DB=
DEV_PASSWORD=
DEV_HOST=localhost
DEV_PORT=5432

# knexfile.cjs configuration

> check current working directory

const dir = process.cwd();

> check current running environment 

const env = process.env.ENVIRONMENT || "";

>  the database details here 

```
exports.development = {}
exports.production = {}

```

# below instructions are used on a terminal window navigate to 'db' folder

create a migration file type:

```

knex migrate:make create_XYZ_table --migrations-directory migrations

```

make sure to rename the file extensions to .cjs

execute migration type:

```

knex migrate:latest --knexfile knexfile.cjs --migrations-directory migrations

```

execute rollback type:

```

knex migrate:rollback --knexfile knexfile.cjs --migrations-directory migrations

```

### Check out the knex documentation

knex URL: https://knexjs.org/guide/migrations.html#migration-cli


create a seed file type:

```

knex seed:make 01_XYZ_test_data --knexfile knexfile.cjs

```

make sure to rename the file extensions to .cjs

execute the seed file type:

```
knex seed:run --knexfile knexfile.cjs

```

## to run the node server

navigate back to the project root directory and type:

```
ENVIRONMENT=development npm run dev

```