Idealy you should use npm build to generate static files from your frontend and have them deployed, but for now, feel free to use this Dockerfile as a reference

back.Dockerfile

FROM node:22 as build

WORKDIR /app

COPY package.json /app/package.json
COPY package-lock.json /app/package-lock.json
RUN npm install

COPY . /app

EXPOSE 9000


CMD ["npm", "start"]

compose.yml

# Just a reference compose file.
services:
  frontend:
    restart: unless-stopped
    build:
      context: ./frontend
    container_name: frontend
    # ports:
    #   - "3000:3000"
    env_file:
      - ./frontend/.env
    networks:
      - gi_local_nw
 
  backend:
    restart: unless-stopped
    build:
      context: ./backend
    container_name: backend
    # ports:
    #   - "9010:9000"
    environment:
      - MONGODB_URI=mongodb://gi_mongodb:27017
    depends_on:
      - frontend
      - mongodb
    env_file:
      - ./backend/.env
    networks:
      - gi_local_nw
      
      
 # If you need this !?
#   mongodb: 
#     image: mongo:latest
#     container_name: gi_mongodb
#     # ports:
#     #   - "27017:27017"
#     volumes:
#       - mongo_data:/data/db
#     networks: 
#       - gi_local_nw
#   gi_mongo-express:
#     image: mongo-express
#     container_name: mongo-express
#     restart: always
#     env_file:
#       - ./backend/.env
#     depends_on:
#       - gi_mongodb
# volumes:
#   mongo_data:
networks:
  gi_local_nw:
    external: false

front.Dockerfile

FROM node:22 
 
WORKDIR /app 
 
COPY package*.json ./ 
 
RUN npm install  
 
COPY . . 
 
ENV NODE_ENV=production 
ENV NODE_OPTIONS="--max_old_space_size=4096" 
 
RUN npm cache clean --force  
 
RUN CI=false npm run build 
 
EXPOSE 3000 
 
CMD ["npm", "start"]