Connect backend with database in docker-CodePudding

I have simple phpmyadmin, mysql containers.

I create new folder with backend in nodejs. At now, I just can't connect to database through backend.

All three containers (phpmyadmin, mysql, api) works and launch. But container api don't connect with database.

This is my main db.js file for connection, which is always throw error.

const mysql = require("mysql");

const db = mysql.createConnection({
    host: "localhost",
    user: "db_user",
    password: "db_user_pass",
    database: "any-game",
    port: 8899,
});

db.connect((err) => {
    if (err) {
        throw new Error("Something went wrong!"); //  Get error always in this line because can't connect to db
    }
});

module.exports = db;

Url for phpmyadmin is localhost:8899. Phpmyadmin work as I expect. Without any error. I can log in to db through login and password in docker-compose. But can't connect with backend.

And docker-compose.yml file

version: "3"

services:
  phpmyadmin: 
    image: phpmyadmin/phpmyadmin
    container_name: phpmyadmin1
    environment: 
      - PMA_ARBITRARY=1
      - PMA_HOST=db
      - PMA_PORT=3306
    restart: always
    links:
      - db
    ports: 
      - 8899:80
    depends_on:
      - db

  api:
    build: ./api
    container_name: api1
    command: npm run start
    restart: unless-stopped
    ports:
      - "3005:3005"
    environment: 
      - PORT=3005
    depends_on:
      - phpmyadmin

  db: 
    image: mysql
    container_name: db
    environment:
      - MYSQL_ROOT_PASSWORD=my_secret_password
      - MYSQL_DATABASE=guess-game
      - MYSQL_USER=db_user
      - MYSQL_PASSWORD=db_user_pass
    restart: always
    ports: 
      - 6033:3306

I tried to write like this:

const db = mysql.createConnection({
    host: "localhost",
    user: "db_user",
    password: "db_user_pass",
    database: "any-game",
});

Like this

const db = mysql.createConnection({
    host: "localhost",
    user: "db_user",
    password: "db_user_pass",
    database: "any-game",
    port: 80,
});

const db = mysql.createConnection({
    host: "localhost",
    user: "db_user",
    password: "db_user_pass",
    database: "any-game",
    port: 6033, // DB port
});

Even

const db = mysql.createConnection({
    host: "127.0.0.1",
    user: "db_user",
    password: "db_user_pass",
    database: "any-game",
});

Please help