🟢 Bilingual Node.js Learning Platform — सीखो, समझो, बनाओ

The World's #1 Free, Open Source, Bilingual Node.js Learning Resource

Written from First Principles | 🇺🇸 English + 🇮🇳 हिन्दी (Devanagari) | Production & Interview Ready

🌐 Created & Maintained by Santosh Gautam — Senior Backend Architect

"Master Node.js from Zero to Production — सीखो, समझो, बनाओ"

🌐 Visit Portal • ⭐ Star Repo • 🍴 Fork Repo • 🐛 Report Bug

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🎯 Our Mission | हमारा लक्ष्य

🇺🇸 English

This repository is built with a single mission: to provide the world's highest-quality, 100% free Node.js learning resource.

• No Paywalls: No hidden modules, courses, or payment gateways.
• First Principles: Everything is explained from first principles, explaining Why, How, and When.
• Bilingual Equality: Comprehensive, matching English and Hindi (Devanagari) sections to ensure language is never a barrier to backend mastery.
• Production & Interview Focused: Packed with Visual ASCII diagrams, runnable production-ready code examples, FAANG-level interview tips, and hands-on project assignments.

🇮🇳 हिन्दी

इस रिपॉजिटरी को बनाने का एक ही लक्ष्य है: दुनिया का सबसे बेहतरीन और 100% मुफ्त Node.js लर्निंग रिसोर्स प्रदान करना।

• कोई पेवॉल नहीं: कोई छिपा हुआ शुल्क या सशुल्क कोर्स नहीं है।
• फर्स्ट प्रिंसिपल्स (बुनियादी सिद्धांत): हर कॉन्सेप्ट को गहराई से समझाया गया है कि कोई चीज़ क्यों, कैसे और कब इस्तेमाल की जाती है।
• समान द्विभाषी (Bilingual) कंटेंट: अंग्रेजी और हिंदी (देवनागरी) दोनों में एक समान ज्ञान दिया गया है ताकि भाषा आपके करियर में रुकावट न बने।
• प्रोडक्शन और इंटरव्यू केंद्रित: विजुअल ASCII डायग्राम, रन-योग्य प्रोडक्शन-रेडी कोड उदाहरण, FAANG-लेवल इंटरव्यू टिप्स और प्रैक्टिकल प्रोजेक्ट असाइनमेंट शामिल हैं।

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🗺️ Learning Roadmap | सीखने का मार्ग

Below is the complete path from a beginner to a production-grade Backend Architect:

[ Beginner (0 Experience) ]
             │
             ▼
[ JavaScript Fundamentals (ES6+) ]
             │
             ▼
[ Node.js Core Fundamentals ] (🟢 v1.x Core Topics)
             │
             ▼
[ Standard Libraries & Streams ]
             │
             ▼
[ Express.js & Middlewares ] (🟡 v2.x Advanced)
             │
             ▼
[ Databases, SQL/NoSQL & ORMs ]
             │
             ▼
[ Caching & Real-time WebSockets ] (🟠 v3.x Production)
             │
             ▼
[ Testing & Security Hardening ]
             │
             ▼
[ Microservices & Event-Driven MQ ] (🔴 v4.x System Design)
             │
             ▼
[ Processes, Workers & Memory ]
             │
             ▼
[ DevOps, Docker & CI/CD Pipelines ] (🏢 v5.x Enterprise)
             │
             ▼
[ Backend System Architect ]

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📊 Repository Progress Tracker | प्रगति ट्रैकर

Parameter	Value	Progress Bar
Total Core Topics	35	[████████████████████] 100%
Completed Topics	35	35 / 35 Completed
Remaining Topics	0	v1.0 Core Release Complete (Roadmap extensions pending)

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📋 Table of Contents | विषय सूची

#	Topic	Difficulty	Status	Est. Time	Languages
01	Core Concepts & Architecture	🟢 Beginner	✅ Complete	1.0 Hour	🇺🇸 🇮🇳
02	Event Loop & Call Stack	🟡 Intermediate	✅ Complete	1.5 Hours	🇺🇸 🇮🇳
03	Modules	🟢 Beginner	✅ Complete	1.0 Hour	🇺🇸 🇮🇳
04	File System	🟡 Intermediate	✅ Complete	1.5 Hours	🇺🇸 🇮🇳
05	Streams	🟠 Advanced	✅ Complete	2.0 Hours	🇺🇸 🇮🇳
06	Buffers	🟡 Intermediate	✅ Complete	1.0 Hour	🇺🇸 🇮🇳
07	Events	🟡 Intermediate	✅ Complete	1.0 Hour	🇺🇸 🇮🇳
08	Async Programming	🟡 Intermediate	✅ Complete	2.0 Hours	🇺🇸 🇮🇳
09	Error Handling	🟠 Advanced	✅ Complete	1.5 Hours	🇺🇸 🇮🇳
10	HTTP Module	🟡 Intermediate	✅ Complete	1.5 Hours	🇺🇸 🇮🇳
11	Express.js	🟡 Intermediate	✅ Complete	2.0 Hours	🇺🇸 🇮🇳
12	REST API	🟡 Intermediate	✅ Complete	2.0 Hours	🇺🇸 🇮🇳
13	Middleware	🟡 Intermediate	✅ Complete	1.0 Hour	🇺🇸 🇮🇳
14	Authentication	🟠 Advanced	✅ Complete	2.5 Hours	🇺🇸 🇮🇳
15	Database	🟡 Intermediate	✅ Complete	2.0 Hours	🇺🇸 🇮🇳
16	Mongoose	🟡 Intermediate	✅ Complete	2.0 Hours	🇺🇸 🇮🇳
17	Sequelize	🟡 Intermediate	✅ Complete	2.0 Hours	🇺🇸 🇮🇳
18	Prisma	🟡 Intermediate	✅ Complete	2.0 Hours	🇺🇸 🇮🇳
19	Redis	🟠 Advanced	✅ Complete	1.5 Hours	🇺🇸 🇮🇳
20	WebSockets	🟠 Advanced	✅ Complete	2.0 Hours	🇺🇸 🇮🇳
21	Microservices	🔴 Expert	✅ Complete	3.0 Hours	🇺🇸 🇮🇳
22	Message Queues	🔴 Expert	✅ Complete	2.5 Hours	🇺🇸 🇮🇳
23	Testing	🟡 Intermediate	✅ Complete	2.0 Hours	🇺🇸 🇮🇳
24	Security	🟠 Advanced	✅ Complete	2.0 Hours	🇺🇸 🇮🇳
25	Performance	🟠 Advanced	✅ Complete	2.0 Hours	🇺🇸 🇮🇳
26	Worker Threads	🔴 Expert	✅ Complete	2.0 Hours	🇺🇸 🇮🇳
27	Child Process	🟠 Advanced	✅ Complete	1.5 Hours	🇺🇸 🇮🇳
28	Process Module	🟠 Advanced	✅ Complete	1.5 Hours	🇺🇸 🇮🇳
29	Memory Management	🔴 Expert	✅ Complete	2.0 Hours	🇺🇸 🇮🇳
30	Environment Variables	🟢 Beginner	✅ Complete	1.0 Hour	🇺🇸 🇮🇳
31	Logging	🟡 Intermediate	✅ Complete	1.0 Hour	🇺🇸 🇮🇳
32	File Upload	🟡 Intermediate	✅ Complete	1.5 Hours	🇺🇸 🇮🇳
33	GraphQL	🟠 Advanced	✅ Complete	2.0 Hours	🇺🇸 🇮🇳
34	Docker & Deployment	🟠 Advanced	✅ Complete	2.0 Hours	🇺🇸 🇮🇳
35	Design Patterns	🔴 Expert	✅ Complete	2.5 Hours	🇺🇸 🇮🇳

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🤝 Contribution & Governance | योगदान

We maintain a strict quality standard for our educational resources. Please review our Contributing Guidelines and Code of Conduct before submitting Pull Requests.

All contributions must follow our:

1. Bilingual Separation Policy: English block first, then Devanagari Hindi translation. No language mixing.
2. 35-Section Layout: Topic files must follow the comprehensive structure without skipping parts.
3. LTS Standards: Code examples must be runnable on Node.js LTS using ES Modules.

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📞 Support & Community | सहायता और समुदाय

• Stuck on a concept? Ask a question on GitHub Discussions.
• Found an error? Open a Bug Report.
• For articles & documentation portal: Visit hisantosh.com.