why to use docker node code example

Example 1: dockerfile for nodejs

# Choose the Image which has Node installed already
FROM node:alpine

# COPY all the files from Current Directory into the Container
COPY ./ ./

# Install the Project Dependencies like Express Framework
RUN npm install

# Tell that this image is going to Open a Port 
EXPOSE 8080

# Default Command to launch the Application
CMD ["npm", "start"]

Example 2: nodejs docker

FROM node:boron

RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app

COPY package.json /usr/src/app/
RUN npm install

COPY . /usr/src/app

EXPOSE 3000

CMD ["npm","start"]