knexfile.js

if (process.env.NODE_ENV !== 'production') {
  require('dotenv').config();
}

module.exports = {

  development: {
    client: 'postgresql',
    connection: {
      host     : process.env.DB_HOST,
      user     : process.env.DB_USER,
      password : process.env.DB_PASS,
      database : process.env.DB_NAME,
      port     : process.env.DB_PORT,
      ssl      : process.env.DB_SSL
    },
    pool: {
      min: 2,
      max: 10
    },
    migrations: {
      tableName: 'knex_migrations'
    }
  },

  staging: {
    client: 'postgresql',
    connection: {
      database: 'my_db',
      user:     'username',
      password: 'password'
    },
    pool: {
      min: 2,
      max: 10
    },
    migrations: {
      tableName: 'knex_migrations'
    }
  },

  production: {
    client: 'postgresql',
    connection: process.env.DATABASE_URL + '?ssl=true',
    debug: true,
    pool: {
      min: 2,
      max: 10
    },
    migrations: {
      tableName: 'knex_migrations'
    }
  }
};