Hands-on with Node.js Internals: Building a CRUD API

In this coding session, I build a fully functional REST API for a Todo application using Node.js and Express. Instead of jumping straight to easy middleware, I took the "hard way" to understand exactly how Node.js processes incoming data. We handle raw data streams, parse buffers manually, and manage a file-based database (JSON) without external libraries. Key Concepts Covered: HTTP Methods: Implementing GET, POST, PUT, and DELETE routes. Node.js Streams: Why data arrives in "chunks" and how to collect it using req.on('data'). File I/O: Reading and writing to a todos.json file asynchronously. Data Integrity: Using the ES6 Spread Operator (...) to merge updates without deleting existing data. Debugging: Fixing common issues like "disappearing titles" and type coercion. This project was a deep dive into the fundamentals of backend development before moving on to Express middleware. Tech Stack: JavaScript, Node.js, Express, File System (fs).