How do I set up a Docker Compose environment for an Express.js application?

How do I set up a Docker Compose environment for an Express.js application?

To set up a Docker Compose environment for an Express.js app, you'll need a Dockerfile and a docker-compose.yml file. Do you have those files ready?

I have a basic Express.js app. Can you help me create those files?

Sure! Your Dockerfile should look like this:

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

And your docker-compose.yml file should be:

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

This will set up your Express.js app to run in a Docker container.

What do I do after creating those files?

After creating those files, you can run docker-compose up in your terminal. This command will build the Docker image and start your Express.js application in a container.

How can I access my app in the browser?

You can access your app by navigating to http://localhost:3000 in your web browser. Your Express.js app should be running there!