Logger added, npm package and called in endpoints. For dev it will create folder loggerFiles and in it two log files. For production we need to add external logger (like azure or aws).

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+      }
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     "wrap-ansi": {
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package.json

     "request": "^2.88.2",
     "swagger-jsdoc": "^6.2.1",
     "swagger-ui-express": "^4.4.0",
-    "validator": "^13.7.0"
+    "validator": "^13.7.0",
+    "winston": "^3.7.2"
   }
 }

src/endpoints/user.js

 const bcrypt = require("bcryptjs/dist/bcrypt")
 const {Router} = require("express")
 const User = require("../models/user")
+const logger = require("../logging/logger")
 
 const getUsers = async (res) => {
     try {
+        logger.silly('hello from logger')
         const allUsers = await User.find({})
         return res.status(200).send(allUsers)
     } catch (e) {
 
         const user = await User.findById(id)
         if (!user) {
+            logger.error('We couldnt find user with the id of '+ id)
             return res.status(404).send("User with the id of: " + id + " doesnt exist")
         }
 

src/logging/logger.js

+const winston = require('winston');
+
+const logger = winston.createLogger({
+    level: 'info',
+    format: winston.format.json(),
+    defaultMeta: { service: 'user-service' },
+    transports: [
+        //
+        // - Write all logs with importance level of `error` or less to `error.log`
+        // - Write all logs with importance level of `silly` or less to `all.log`
+        //
+        new winston.transports.File({ filename: 'loggerFiles/error.log', level: 'error' }),
+        new winston.transports.File({ filename: 'loggerFiles/all.log', level: 'silly' }),
+    ],
+});
+
+//
+// If we're not in production then log to the `console` with the format:
+// `${info.level}: ${info.message} JSON.stringify({ ...rest }) `
+//
+if (process.env.NODE_ENV !== 'production') {
+    logger.add(new winston.transports.Console({
+        format: winston.format.simple(),
+    }));
+}
+
+module.exports = logger