version: "3"
services:

  app:
    container_name: this-app
    restart: always
    build: ../path-to-this-app/
    volumes:
     - .:/src/app
     - /src/app/node_modules
    ports:
      - "3001:3001"
    links:
      - mongo
    environment:
      WAIT_HOSTS: mongo:27017

   mongo:
    container_name: mongo
    image: mongo
    volumes:
      - ./data:/data/db
    ports:
      - "27017:27017"