backend/knexfile.js

import "dotenv/config";

export default {
  development: {
    client: "mysql",
    connection: {
      host: process.env.DB_HOST,
      user: process.env.DB_USER,
      port: process.env.DB_PORT,
      password: process.env.DB_PASS,
      database: process.env.DB_SCHEMA,
      charset: "utf8mb4",
      collation: "utf8mb4_bin"
    },
    migrations: {
      tableName: "knex_migrations",
      directory: "./db/migrations"
    },
    seeds: {
      tableName: "knex_seeds",
      directory: "./db/seeds"
    }
  }
};