mongo express docker compose

docker-compose.yml

version: '2'
services:
  mongodb:
    image: bitnami/mongodb:4.1-ol-7
    volumes:
      - mongodbdata:/bitnami
    # ports:
    #   - '27017:27017'
  web:
    image: node:8.12-alpine
    container_name: myexpress
    volumes:
      - .:/app
    working_dir: /app
    command: npm start
    ports:
      - '3000:3000'
    links:
      - mongodb
volumes:
  mongodbdata: