DEV Community: Akhil Malviya

🔍 Introducing responsive-debugger: Instantly Visualize Breakpoints While Developing

Akhil Malviya — Sat, 19 Jul 2025 05:23:55 +0000

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🚀 Overview

One of the most overlooked — yet critical — parts of frontend development is responsive design debugging. While tools like Chrome DevTools are powerful, they can be cumbersome for quick layout visualization.

That's why I built responsive-debugger — a lightweight, plug-and-play utility to instantly visualize screen size breakpoints right in the browser, during development.

✅ Key Features

📐 Displays screen size + breakpoint in real-time
🧠 No DevTools toggling
🪶 Tiny footprint — no external dependencies
🎨 Customizable themes and position
⚡ Framework-agnostic (React, Vue, Svelte, plain HTML, etc.)
🛠️ Perfect companion for Tailwind, Bootstrap, or any responsive CSS framework

📦 Installation

You can install responsive-debugger globally or as a dev dependency:

npm install responsive-debugger --save-dev

Or using Yarn:

yarn add responsive-debugger --dev

🔧 Usage

Just import and initialize it in your app (preferably only in dev):

import { injectDebugger } from 'responsive-debugger';

injectDebugger({
  position: 'top-right', // top-left | top-right | bottom-left | bottom-right
  theme: 'dark', // or 'light'
  breakpoints: {
    sm: 640,
    md: 768,
    lg: 1024,
    xl: 1280,
    '2xl': 1536,
  },
});

The breakpoint viewer will appear in the corner of your screen showing:

📱 sm | 640px
💻 md | 768px
🖥️ lg | 1024px

💡 Ideal For:

Tailwind CSS devs working on responsive layouts
Freelancers & agencies doing quick layout audits
Frontend teams improving handoff with designers
Developers who hate resizing the browser 100 times a day 😅

🧱 Tech Stack

Built using:

TypeScript
Vanilla DOM manipulation (no frameworks)
Zero dependencies — ultra lightweight

🧑‍💻 Why I Built This

As a frontend developer, I was constantly resizing my browser, opening DevTools, checking screen widths — it interrupted my flow. I wanted something always visible but non-intrusive.

So I built responsive-debugger to stay in the zone while building fluid UIs.

📈 Future Plans

🎛️ UI configurator panel
🧩 Chrome Extension version
🔌 Framework plugins (Next.js, Vue, etc.)
💬 Community suggestions!

🤝 Contribute or Sponsor

Got ideas, issues, or want to contribute? Head to the GitHub repo:

🔗 GitHub Repository

If you like this tool, consider starring the repo ⭐ or sponsoring for continued development ❤️

📣 Spread the Word

If you find responsive-debugger helpful, please share it with your team or on Twitter/X/LinkedIn!

npm install responsive-debugger --save-dev

💬 Feedback?

Drop a comment or open an issue — I’d love to hear how you’re using responsive-debugger.

🧠 TL;DR

responsive-debugger is the lightweight tool I wish I had years ago. It’s here to help developers build more responsive, user-friendly interfaces without interrupting their flow.

Give it a try — your workflow will thank you.

🐳 Mastering Docker: A Complete Beginner to Advanced Guide (With Real-World Use Cases)

Akhil Malviya — Thu, 17 Jul 2025 11:20:51 +0000

Docker is one of the most powerful tools in modern software development. Whether you're a beginner trying to containerize your first app or an advanced engineer managing CI/CD pipelines, this guide will walk you through everything you need to know — in plain English.

🔰 Beginner Level

What is Docker?

Dockerlets you package and run applications in isolated environments called containers.

✅ Why Use It?
Ensures your app runs the same everywhere — no more "it works on my machine."

What is a Docker Image?

A Docker image is a read-only blueprint of your app that includes the code, dependencies, and OS environment.

bash
docker build -t my-app .

3. What is a Docker Container?

A container is a running instance of an image. It’s isolated, fast, and lightweight.

docker run my-app

4. Dockerfile

A Dockerfile is a set of instructions for building Docker images.

FROM node:18
COPY . /app
WORKDIR /app
RUN npm install
CMD ["npm", "start"]

5. Docker Hub

Docker Hub is like GitHub, but for images. You can push/pull images from it.

docker pull nginx
docker push myuser/my-app

6. Basic Commands

docker build -t app .    # Build image
docker run -p 3000:3000 app  # Run container
docker ps                 # List containers
docker stop <id>          # Stop container
docker exec -it <id> bash # Open shell inside container

7. Port Mapping

Maps container ports to host ports. Example:

docker run -p 8080:3000 app

Now access the app at localhost:8080.

8. Volumes

Used to persist data outside of the container.

docker run -v /data:/app/data my-app

⚙️ Intermediate Level

9. Docker Compose

Use docker-compose.yml to define multi-container apps.

version: "3"
services:
  app:
    build: .
    ports:
      - "3000:3000"
  db:
    image: postgres
    volumes:
      - pgdata:/var/lib/postgresql/data
volumes:
  pgdata:

docker-compose up

10. Docker Networks

Enables communication between containers.

docker network create my-net
docker run --network my-net ...

11. Bind Mount vs Volume

Bind Mount: Links to local folders (-v ./data:/data)
Volume: Managed by Docker (docker volume create)

12. Docker Context

Lets you switch between environments (e.g., local and remote).

docker context use remote

13. Dockerfile Layers

Each instruction (RUN, COPY, etc.) creates a layer.

✅ Helps with caching and faster rebuilds.

14. .dockerignore

Ignore files from being sent to the Docker daemon.

node_modules
.env
.git

🚀 Advanced Level

15. Docker-in-Docker (DinD)

Run Docker inside Docker. Useful in CI/CD tools like GitLab CI.

image: docker:latest
services:
  - docker:dind

⚠️ Security Risk: Grants full control over the Docker host.

16. Docker Socket

Access the host Docker engine inside containers.

-v /var/run/docker.sock:/var/run/docker.sock

17. Multi-stage Builds

# Builder
FROM node:18 as builder
WORKDIR /app
COPY . .
RUN npm run build

# Final
FROM nginx
COPY --from=builder /app/dist /usr/share/nginx/html

✅ Reduces image size and exposure of build tools.

18. Healthcheck

HEALTHCHECK CMD curl --fail http://localhost:3000 || exit 1

Docker will monitor container health and restart if needed.

19. Entrypoint vs CMD

ENTRYPOINT ["node"]
CMD ["app.js"]

ENTRYPOINT: Always runs
CMD: Default arguments

20. Docker Orchestration Tools

Docker Swarm: Built-in clustering
Kubernetes: Industry standard for scaling, self-healing, rolling deployments

🧠 Real-World Scenarios

Use Case	Docker Concepts Used
Simple React App	Dockerfile, Image, Container, Port Mapping
MERN Stack App	Compose, Networks, Volumes
GitLab CI for Deployments	Docker-in-Docker, Multi-stage, Context
Production-grade Builds	Multi-stage, Healthcheck, Entrypoint

📌 Final Tips

🧹 Clean up unused stuff:

  docker system prune -a

📦 List volumes:

  docker volume ls

🔍 Debug:

  docker logs <container-id>