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How to Create a Docker Image of Your Node.js App & Push to Docker Hub

In this step-by-step tutorial, learn how to containerize your Node.js application by creating a Docker image and pushing it to Docker Hub. Whether you're a beginner or looking to refine your Docker skills, this video covers everything:
✔️ Setting up a Node.js app
✔️ Writing a Dockerfile
✔️ Building the Docker image
✔️ Running the container locally
✔️ Tagging and pushing the image to Docker Hub

This tutorial is perfect for developers looking to streamline their deployment process with Docker. Don’t forget to like, subscribe, and share if you find it helpful!


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Single stage build dockerfile
1. Use an official Node.js runtime as a parent image
FROM node:18

2. Set the working directory inside the container (root is /usr/src/app)
WORKDIR /usr/src/app

3. Copy package.json and package-lock.json from the current directory (backend)
COPY package*.json ./

4. Install any needed dependencies
RUN npm install --production

5. Copy the rest of the backend directory content to the working directory
COPY . .

6. Set the WORKDIR to the src folder inside the container
WORKDIR /usr/src/app/src

7. Expose the necessary port (example: 3000)
EXPOSE 8080

8. Command to run the app
CMD ["node", "index.js"]



//Docker command

docker build -t docker_image .
docker run -p 8080:8080 docker_image

Push the image to dockerhub

docker tag docker_image brajeshsaxena01/docker_image
docker push brajeshsaxena01/docker_image

Multistage build Dockerfile
Stage 1: Build stage
FROM node:18 AS builder

Set the working directory inside the container
WORKDIR /usr/src/app

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

Install all dependencies (including devDependencies)
RUN npm install

Copy the rest of the backend directory to the working directory
COPY . .

Stage 2: Production image stage
FROM node:18-alpine

Set the working directory for the production image
WORKDIR /usr/src/app

Copy only the necessary files from the build stage
COPY --from=builder /usr/src/app /usr/src/app

Install only production dependencies
RUN npm prune --production

Set the working directory to the src folder inside the container
WORKDIR /usr/src/app/src

Expose the necessary port (example: 8080)
EXPOSE 8080

Command to run the app
CMD ["node", "index.js"]


//Login to docker hub
docker login
docker pull brajeshsaxena01/docker_image:latest


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