A Node.js dockerfile example

Dockerfile

# Use an official Node.js runtime as the base image
FROM node:14

# Set environment variables
ENV NODE_ENV=production
ENV PORT=3000

# Create a work directory for the application
WORKDIR /app

# Copy package.json and package-lock.json to the work directory
COPY package*.json ./

# Install project dependencies
RUN npm install

# Copy the rest of the application code to the work directory
COPY . .

# Expose a port for the application to listen on
EXPOSE 3000

# Set the default command to start the application
CMD [ "npm", "start" ]