Npm server not available after docker compose - node.js

Question

I'm fairly new to docker. I was trying to separate my web app on modules for backend (django), frontend (react) and with some postgres db.
Here is my docker-compose.yml :
version: "3.8"
services:
db:
image: postgres
container_name: postgres
environment:
- POSTGRES_DB=postgres
- POSTGRES_USER=postgres
- POSTGRES_PASSWORD=postgres
volumes:
- ./private/posgtesql/data/data:/var/lib/postgresql/data
app:
build: .
container_name: app
working_dir: /app/label_it
command: python manage.py runserver 0.0.0.0:8000
volumes:
- .:/app
ports:
- "8000:8000"
depends_on:
- db
front:
build:
context: ./label_it
dockerfile: Dockerfile
container_name: front
command: npm run dev
working_dir: /app/label_it/front
volumes:
- ./label_it/front:/app/label_it/front
- ./label_it/front/node-modules:/app/./label_it/front/node_modules
ports:
- "8001:8000"
depends_on:
- app
Django side runs like dream, browsing 127.0.0.1:8000 responses with server site. BUT.
There is nothing on 127.0.0.1:8001.
Correct me if I'm wrong, but I should be getting both servers for django AND for react on respecting ports??
Searched whole internet looking for solution. All I found was to check if node server actually runs on 0.0.0.0:8001 and it does according to :
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
baa18d3bfa73 labeling-lab-platform_front "docker-entrypoint.s…" 24 minutes ago Up 24 minutes 3000/tcp, 0.0.0.0:8001->8000/tcp front
6a76ba3a901b labeling-lab-platform_app "python manage.py ru…" About an hour ago Up 24 minutes 0.0.0.0:8000->8000/tcp app
c0d1d27ed930 postgres "docker-entrypoint.s…" About an hour ago Up 24 minutes 5432/tcp postgres
It's my second day dealing with this issue and I'm realy stuck.
EDIT:
my package.json with declared dev server:
{
"name": "static",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"dev": "webpack --mode development --watch",
"build": "webpack --mode production"
},
"keywords": [],
"author": "",
"license": "ISC",
"dependencies": {
"#babel/plugin-proposal-class-properties": "^7.12.1",
"#date-io/date-fns": "^1.3.13",
"#emotion/core": "^11.0.0",
"#emotion/react": "^11.1.4",
"#emotion/styled": "^11.0.0",
"#material-ui/core": "^5.0.0-alpha.20",
"#material-ui/data-grid": "^4.0.0-alpha.17",
"#material-ui/icons": "^4.11.2",
"#material-ui/pickers": "^3.2.10",
"#material-ui/unstyled": "^5.0.0-alpha.20",
"axios": "^0.21.1",
"babel-preset-react": "^6.24.1",
"clsx": "^1.1.1",
"date-fns": "^2.16.1",
"react-desktop-notification": "^1.0.9",
"react-redux": "^7.2.2",
"react-router-dom": "^5.2.0",
"react-window": "^1.8.6",
"react-window-infinite-loader": "^1.0.5",
"redux": "^4.0.5",
"regenerator-runtime": "^0.13.7",
"xlsx": "^0.16.9"
},
"devDependencies": {
"#babel/core": "^7.12.10",
"#babel/preset-env": "^7.12.11",
"#babel/preset-react": "^7.12.10",
"babel-loader": "^8.2.2",
"react": "^17.0.1",
"react-dom": "^17.0.1",
"webpack": "^5.11.0",
"webpack-cli": "^4.3.0"
}
}