How do I set up an Express.js application in Docker?

How do I set up an Express.js application in Docker?

To set up an Express.js application in Docker, you'll need to create a Dockerfile and a docker-compose.yml file. Would you like a step-by-step guide?

Yes, please provide the steps!

First, create a Dockerfile in your project directory. It should look something like this:

FROM node:14
WORKDIR /usr/src/app
COPY package*.json ./
RUN npm install
COPY . .
EXPOSE 3000
CMD ["node", "app.js"]

Next, create a docker-compose.yml file to define your services.

What should the docker-compose.yml file contain?

Your docker-compose.yml file should look like this:

version: '3'
services:
  web:
    build: .
    ports:
      - "3000:3000"

This will build your Docker image and map port 3000 on your host to port 3000 in the container.