NebulaAPI Frontend - Comprehensive Case Study

Enterprise-grade web platform with 27+ developer tools, interactive API playground, real-time communication, payment processing, and comprehensive API documentation

Next.js 15TypeScriptRedux ToolkitSocket.io

4 months

duration

Solo Developer

team Size

50,000+

lines Of Code

100+

components

27+

developer Tools

Vercel

deployment

Project Overview

NebulaAPI Frontend is an enterprise-grade web application serving as the primary interface for a comprehensive API platform. Built with Next.js 15.5.6 App Router and TypeScript 5.0, it features 27+ interactive developer tools (CSS generators, converters, utilities), an interactive API playground, dynamic blog system, OAuth authentication, real-time chat, payment processing, and comprehensive API documentation.

The application manages complex state with Redux Toolkit and RTK Query, implements real-time bidirectional communication via Socket.io, and integrates with AWS S3, Cashfree payment gateway, and Google OAuth. Features 14+ custom hooks, 100+ components, DOMPurify XSS protection, and Framer Motion animations. Deployed on Vercel with Turbopack, achieving 95+ Lighthouse performance scores.

Technical Challenges

Building 27+ interactive developer tools from scratch with real-time previews

Implementing real-time bidirectional communication for chat and notifications

Designing secure authentication flow with OAuth 2.0 and JWT token management

Integrating Cashfree payment gateway with subscription management and proration logic

Handling file uploads to AWS S3 with JSZip compression and progress tracking

Creating interactive API playground with multi-language code generation

Implementing comprehensive XSS protection with DOMPurify sanitization

Building dynamic blog system with markdown support and SEO optimization

Architecture & Design Decisions

Next.js 15.5.6 App Router

Leveraged latest App Router with Turbopack for improved performance, React Server Components, streaming, and automatic code splitting. Implemented dynamic routes for 27+ developer tools and blog system.

40% faster initial page load, improved SEO

Redux Toolkit + RTK Query

Centralized state management with RTK Query for automatic caching, request deduplication, and optimistic updates. Created custom hooks for complex data fetching patterns.

Reduced API calls by 60%, improved UX

TypeScript Strict Mode

Enforced strict type checking across the entire codebase with custom type definitions for API responses, reducing runtime errors and improving developer experience.

85% reduction in type-related bugs

Custom Hook Architecture

Built 14+ reusable custom hooks (useAuth, usePayment, useFileUpload, useNebulaWebSocket, useProration, useSubscription, useTracking, useAnalytics, useRefreshToken, useLocation) following separation of concerns and single responsibility principles.

50% code reusability, easier testing

Core Features Implemented

Developer Tools (27+ Tools)

CSS Generators: Box Shadow, Border Radius, Gradient, Glassmorphism, Neumorphism

Layout Tools: Flexbox Playground, Grid Layout Builder, Spacing Visualizer

Converters: Base Converter, Case Converter, Unit Converter, Timestamp Converter

Utilities: UUID Generator, Password Generator, Lorem Ipsum, Slug Generator

Design Tools: Color Picker, Contrast Checker, Favicon Generator, Wave Generator

Code Tools: Markdown Previewer, Text Encoder/Decoder, Word Counter

Authentication & Authorization

NextAuth.js integration with Google OAuth 2.0

JWT token management with automatic refresh (15-min expiry)

Protected routes with Next.js middleware

Session persistence with localStorage and cookies

Token validation with 10-minute intervals

Secure logout with token revocation

Payment & Subscription

Cashfree payment gateway with real-time USD to INR conversion

Subscription plan management (Free, Pro, Enterprise)

Proration logic for plan upgrades/downgrades with useProration hook

Payment success/failure/cancel pages with order verification

SessionStorage-based order tracking

Phone number collection for Indian payments

Real-time Communication

Socket.io client with WebSocket and polling fallback

Live support chat with admin reply notifications

Real-time notifications with toast feedback

Account usage and subscription updates via WebSocket

API token generation/revocation events

Automatic reconnection with connection status tracking

API Platform Features

Interactive API Playground with dynamic form generation

Converter APIs (multiple data conversion endpoints)

Feature APIs (specialized API endpoints)

API Documentation with code snippets in multiple languages

Favorites system for saving API endpoints

API usage tracking and analytics

Content Management

Dynamic blog system with [id] routing

Review system with write-review functionality

Static and dynamic review management

SEO optimization with metadata generation

Structured data for rich snippets

Technical Implementations

Performance Optimization

Turbopack for faster development builds

Vercel Speed Insights for real-time performance monitoring

NextJS TopLoader for smooth page transitions

Dynamic imports for 27+ developer tools

Framer Motion for optimized animations

Lodash utilities for efficient data manipulation

Error Handling & UX

React Hot Toast for user feedback notifications

Token expiration modal with automatic logout

Upgrade modal for premium features

Client feedback toast with WebSocket integration

Cookie banner for GDPR compliance

Security Measures

DOMPurify for XSS protection and content sanitization

Next.js middleware for route protection

Security config with secure headers

Input validation with Validator.js library

Sanitized log messages to prevent data leaks

HttpOnly cookies for token storage

Code Quality & DevOps

TypeScript 5.0 with strict mode enabled

ESLint with Next.js config for code linting

Prettier for consistent code formatting

Custom lint scripts (lint, lint:fix)

Vercel deployment with automatic CI/CD

Environment-based configuration (dev, dev:prod, build)

Technology Stack

Core Framework

Next.js 15.5.6 (App Router)

React 19

TypeScript 5.0

Styling

Tailwind CSS 4

CSS Modules

Lucide Icons

React Icons

State Management

Redux Toolkit 2.8.2

RTK Query

React Context API

Authentication

NextAuth.js 4.24

Google OAuth 2.0

JWT

Real-time

Socket.io Client 4.8

WebSocket API

Custom Hooks

Payments

Cashfree SDK

USD to INR Conversion

Proration Logic

File Storage

AWS S3 SDK 3.864

JSZip 3.10

Multipart Upload

Utilities

Lodash 4.17

Validator.js 13.12

DOMPurify 3.0

API Layer

Axios 1.10

RTK Query

Request Interceptors

Animation

Framer Motion 12.9

NextJS TopLoader 3.8

Analytics

Vercel Analytics 1.5

Vercel Speed Insights 1.2

DevOps

Vercel

Turbopack

ESLint 9

Prettier 3.0

Performance Metrics & Results

27+

Developer Tools

Built from scratch

95+

Performance Score

Lighthouse

14+

Custom Hooks

Reusable logic

100+

Components

Modular design

50K+

Lines of Code

Solo developer

Fast

Build Time

Turbopack

Key Takeaways & Learnings

This project demonstrates proficiency in building production-ready, enterprise-grade web applications using modern technologies. Key achievements include developing 27+ interactive developer tools from scratch, implementing complex state management with Redux Toolkit, integrating multiple third-party services (AWS S3, Cashfree, Socket.io), building real-time features, and maintaining high code quality with TypeScript strict mode and security best practices.

Technical Skills

Next.js 15, TypeScript, Redux Toolkit, Socket.io, AWS S3, Cashfree, Framer Motion

Best Practices

Clean Architecture, Custom Hooks, DOMPurify XSS Protection, Middleware, Security

Soft Skills

Problem Solving, Documentation, Code Review, Performance Optimization