Merge pull request #73 from Esavwede/ogaga/backend/events

Add: [Backend] ogaga/backend/nodeevents

Author: Tejas-Santosh-Nalawade

Domains/Backend/MiniProjects/NodeEvents/README.md

@@ -0,0 +1,224 @@
+**Contributor:** Ogagaoghene Esavwede
+**Domain:** Backend
+**Difficulty:** Beginner–Intermediate
+**Tech Stack:** Node.js, Express.js, Pino
+
+# 🚀 Express Logging Server with Pino
+
+---
+
+## 📝 Description
+
+A simple Express.js server that replaces all `console.log` statements with a **structured logging system** using **Pino** — a fast, production-grade logging library for Node.js.
+This project demonstrates how to create a centralized logger, use it throughout your app, and log useful events like route access and server startup.
+
+---
+
+## 🎯 Features
+
+- ✅ Centralized logger configuration
+- ✅ Structured JSON logs
+- ✅ Replaces `console.log` with `logger.info`, `logger.error`, etc.
+- ✅ Lightweight and high performance (using Pino)
+- ✅ Works in production and development environments
+- ✅ Easily extensible for file or external log management
+
+---
+
+## 🛠️ Tech Stack
+
+- **Node.js** – Runtime environment
+- **Express.js** – Web framework
+- **Pino** – Fast JSON logger
+
+---
+
+## 🚀 How to Run
+
+### Prerequisites
+
+- Node.js installed (v14 or higher)
+- npm or yarn package manager
+
+### Installation Steps
+
+1. **Install dependencies**
+
+   ```bash
+   npm install
+   ```
+
+2. **Start the server**
+
+   ```bash
+   npm start
+   ```
+
+3. **Server runs at**
+
+   ```
+   http://localhost:3000
+   ```
+
+4. **See logs in terminal**
+
+   ```
+   {"level":30,"time":1729325400000,"msg":"Server running and listening on PORT: 3000","pid":12345,"hostname":"localhost"}
+   ```
+
+---
+
+## 📁 Project Structure
+
+```
+logging/
+├── src/
+│   ├── app.js               # Main Express server file
+│   └── logging/
+│       └── logger.js        # Centralized logger configuration
+├── package.json             # Dependencies and scripts
+├── .gitignore               # Git ignore file
+└── README.md                # Documentation
+```
+
+---
+
+## 📡 Example Usage
+
+### app.js
+
+```javascript
+import express from "express";
+import logger from "./logging/logger.js";
+
+const app = express();
+const PORT = process.env.PORT || 3000;
+
+app.get("/", (req, res) => {
+  logger.info("User hit home route");
+  res.status(200).json({ success: true, message: "Welcome to the server" });
+});
+
+app.listen(PORT, () => {
+  logger.info("Server running and listening on PORT: " + PORT);
+});
+```
+
+### logger.js
+
+```javascript
+import pino from "pino";
+
+const logger = pino({
+  level: "info",
+});
+
+export default logger;
+```
+
+---
+
+## 💻 Code Comparison
+
+### ❌ Old Way (Using `console.log`)
+
+```javascript
+app.listen(PORT, () => {
+  console.log("Server running on port " + PORT);
+});
+```
+
+### ✅ New Way (Using `logger.info`)
+
+```javascript
+app.listen(PORT, () => {
+  logger.info("Server running and listening on PORT: " + PORT);
+});
+```
+
+---
+
+## 📚 Learning Outcomes
+
+### Skills Practiced
+
+- ✅ Structured logging in Node.js
+- ✅ Using Pino for performance logging
+- ✅ Creating reusable log modules
+- ✅ Logging best practices
+
+### Concepts Learned
+
+- Importance of centralized logging
+- Structured vs. unstructured logs
+- Logging levels (`info`, `warn`, `error`, `debug`)
+- Environment-based logging strategies
+
+---
+
+## 🎨 Enhancement Ideas
+
+Want to improve this project? Try adding:
+
+1. **Pretty Logs** – Use `pino-pretty` for human-readable logs
+
+   ```bash
+   npm install pino-pretty
+   npm start | npx pino-pretty
+   ```
+
+2. **File Logging** – Pipe logs into a file:
+
+   ```bash
+   node src/app.js > server.log
+   ```
+
+3. **Environment-specific Levels** – Use `debug` level in dev, `info` in prod
+4. **HTTP Request Logging** – Combine Pino with `pino-http`
+5. **Error Tracking** – Send logs to monitoring tools like Logtail, Datadog, or Sentry
+
+---
+
+## 🧪 Testing
+
+### Using curl
+
+```bash
+curl http://localhost:3000/
+```
+
+**Terminal Output:**
+
+```bash
+{"level":30,"time":1729325400000,"msg":"User hit home route","pid":12345,"hostname":"localhost"}
+```
+
+---
+
+## 🚀 Future Enhancements
+
+- [ ] Add pretty-print logs in development
+- [ ] Add log file rotation
+- [ ] Add request logging middleware
+- [ ] Add error logging middleware
+- [ ] Add environment-based log filtering
+
+---
+
+## 📄 License
+
+MIT License — Free to use and modify!
+
+---
+
+## 🤝 Contributing
+
+This project is open-source and created to help developers learn **how to replace `console.log` with a proper logger** in Node.js applications.
+Feel free to:
+
+- Fork and enhance
+- Report issues
+- Suggest improvements
+- Use it as a logging starter template
+
+---

Domains/Backend/MiniProjects/NodeEvents/app.js

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+const EventEmitter = require("events");
+
+// Create an instance
+const emitter = new EventEmitter();
+
+// Listen for an event
+emitter.on("greet", (name) => {
+  console.log(`Hello, ${name}!`);
+});
+
+// Emit (trigger) the event
+emitter.emit("greet", "Ogaga");