nodejs/
├── 📄 index.md
├── 📄 interview-questions.md
│
├── 📂 fundamentals/                (4 files)
│   ├── introduction.md
│   ├── architecture.md
│   ├── core-modules.md
│   ├── modules-commonjs-vs-esm.md
│   └── npm-and-package-json.md
│
├── 📂 core/                        (4 files)
│   ├── async-programming.md
│   ├── error-handling.md
│   ├── event-emitter.md
│   └── streams-and-buffers.md
│
├── 📂 web/                         (7 files)
│   ├── building-apis.md
│   ├── express-framework.md
│   ├── authentication-security.md
│   ├── validation.md
│   ├── file-uploads.md
│   ├── websockets-realtime.md
│   └── graphql.md
│
├── 📂 data/                        (3 files)
│   ├── databases.md
│   ├── caching.md
│   └── message-queues.md
│
└── 📂 production/                  (9 files)
    ├── project-architecture.md
    ├── production-architecture.md
    ├── config-and-environment.md
    ├── logging-and-monitoring.md
    ├── performance.md
    ├── testing.md
    ├── design-patterns.md
    ├── clustering-and-worker-threads.md
    └── deployment.md