Adding NodeJs Logging CodeExamples (#199)

* Adding NodeJs Logging CodeExamples

* Adding NodeJs Logging CodeExamples

nodejs/logging-file/README.md

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+# Node.js Logging: Novice to Expert 
+
+### Run `npm install` to get started
+
+To use new Winston Feature
+- Switch logger import in logging-via-winston/app.js 
+`const logger = require("./logger");`
+
+- Example: 
+
+To Use winston prettyPrint switch logger import to:
+`const logger = require("./logger-prettyPrint.js");`

nodejs/logging-file/app-console.js

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+const express = require("express");
+const app = express();
+
+app.get("/", (req, res, next) => {
+  console.log("debug", "Hello, Winston!");
+  console.log("The is the home '/' route.");
+  res.status(200).send("Logging Hello World..");
+});
+
+app.get("/event", (req, res, next) => {
+  try {
+    throw new Error("Not User!");
+  } catch (error) {
+    console.error("Events Error: Unauthenticated user");
+    res.status(500).send("Error!");
+  }
+});
+
+app.listen(3000, () => {
+  console.log("Server Listenning On Port 3000");
+});

nodejs/logging-file/logging-via-winston/app.js

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+const express = require("express");
+const logger = require("./logger");
+const app = express();
+
+app.get("/", (req, res, next) => {
+  logger.log("debug", "Hello, Winston!");
+  logger.debug("The is the home '/' route.");
+  res.status(200).send("Logging Hello World..");
+});
+
+app.get("/event", (req, res, next) => {
+  try {
+    throw new Error("Not User!");
+  } catch (error) {
+    logger.error("Events Error: Unauthenticated user");
+    res.status(500).send("Error!");
+  }
+});
+
+app.listen(3000, () => {
+  logger.info("Server Listenning On Port 3000");
+});

nodejs/logging-file/logging-via-winston/logger-log-rotation.js

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+const { format, createLogger, transports } = require("winston");
+const { combine, label, json } = format;
+require("winston-daily-rotate-file");
+
+//Label
+const CATEGORY = "Log Rotation";
+
+//DailyRotateFile func()
+const fileRotateTransport = new transports.DailyRotateFile({
+  filename: "logs/rotate-%DATE%.log",
+  datePattern: "YYYY-MM-DD",
+  maxFiles: "14d",
+});
+
+const logger = createLogger({
+  level: "debug",
+  format: combine(label({ label: CATEGORY }), json()),
+  transports: [fileRotateTransport, new transports.Console()],
+});
+
+module.exports = logger;

nodejs/logging-file/logging-via-winston/logger-multiple-transports.js

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+const { format, createLogger, transports } = require("winston");
+const { combine, timestamp, label, printf, prettyPrint } = format;
+const CATEGORY = "winston custom format";
+
+const logger = createLogger({
+  level: "debug",
+  format: combine(
+    label({ label: CATEGORY }),
+    timestamp({
+      format: "MMM-DD-YYYY HH:mm:ss",
+    }),
+    prettyPrint()
+  ),
+  transports: [
+    new transports.File({
+      filename: "logs/example.log",
+    }),
+    new transports.File({
+      level: "error",
+      filename: "logs/error.log",
+    }),
+    new transports.Console(),
+  ],
+});
+
+module.exports = logger;

nodejs/logging-file/logging-via-winston/logger-prettyPrint.js

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+const { format, createLogger, transports } = require("winston");
+const { combine, timestamp, label, printf, prettyPrint } = format;
+const CATEGORY = "winston custom format";
+
+const logger = createLogger({
+  level: "debug",
+  format: combine(
+    label({ label: CATEGORY }),
+    timestamp({
+      format: "MMM-DD-YYYY HH:mm:ss",
+    }),
+    prettyPrint()
+  ),
+  transports: [new transports.Console()],
+});
+
+module.exports = logger;

nodejs/logging-file/logging-via-winston/logger-printf.js

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+const { format, createLogger, transports } = require("winston");
+
+const { combine, timestamp, label, printf } = format;
+const CATEGORY = "winston custom format";
+
+//Using the printf format.
+const customFormat = printf(({ level, message, label, timestamp }) => {
+  return `${timestamp} [${label}] ${level}: ${message}`;
+});
+
+const logger = createLogger({
+  level: "debug",
+  format: combine(label({ label: CATEGORY }), timestamp(), customFormat),
+  transports: [new transports.Console()],
+});
+
+module.exports = logger;

nodejs/logging-file/logging-via-winston/logger-transport.js

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+const { createLogger, transports, format } = require("winston");
+
+const logger = createLogger({
+  level: "debug",
+  format: format.json(),
+  //logger method...
+  transports: [
+    //new transports:
+    new transports.File({
+      filename: "logs/example.log",
+    }),
+  ],
+  //...
+});
+
+module.exports = logger;

nodejs/logging-file/logging-via-winston/logger.js

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+const { createLogger, transports, format } = require("winston");
+
+const logger = createLogger({
+  level: "debug",
+  format: format.json(),
+  transports: [new transports.Console()],
+});
+
+module.exports = logger;

nodejs/logging-file/package.json

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+{
+  "name": "logging-file",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "express": "^4.18.1",
+    "winston": "^3.8.1",
+    "winston-daily-rotate-file": "^4.7.1"
+  }
+}