How can I use Docker Compose with Express.js?

How can I use Docker Compose with Express.js?

You can use Docker Compose to define and run multi-container Docker applications. For Express.js, you'll typically create a docker-compose.yml file that specifies your Node.js service and any other services you need, like a database.

Can you show me a sample docker-compose.yml file for an Express.js app?

Sure! Here's a simple example:

version: '3'
services:
  web:
    image: node:14
    working_dir: /usr/src/app
    volumes:
      - .:/usr/src/app
    ports:
      - '3000:3000'
    command: 'npm start'
  db:
    image: mongo
    ports:
      - '27017:27017'

What do I need to include in my Express.js app to connect to the MongoDB service?

You'll need to use the mongoose library to connect to MongoDB. In your Express app, you can set it up like this:

const mongoose = require('mongoose');

mongoose.connect('mongodb://db:27017/mydatabase', { useNewUrlParser: true, useUnifiedTopology: true });