handle - everything about error handling

Author: sourabh

controllers/home.js

@@ -1,12 +1,16 @@
-exports.home = (req,res)=>{
-    res.status(200).json({
-        success:true,
-        gretting:"Hello,Home Page From API"
-    })
-}
-exports.Dummy = (req,res)=>{
-    res.status(200).json({
-        success:true,
-        gretting:"Hello,Dummy From API"
-    })
-}
+const BigPromise = require("../middlewares/bigPromise");
+
+exports.home = BigPromise(async(req, res) => {
+  //const db = await something();  
+  res.status(200).json({
+    success: true,
+    gretting: "Hello,Home Page From API",
+  });
+});
+
+exports.Dummy = (req, res) => {
+  res.status(200).json({
+    success: true,
+    gretting: "Hello,Dummy From API",
+  });
+};

map_project.js

@@ -16,14 +16,34 @@ Ref: ✈️🔗https://expressjs.com/en/5x/api.html#router
 @ABOUT_MORGAN
 Ref: ✈️🔗 https://www.npmjs.com/package/morgan
 SCROLL ON till Bottom ...above link
-😗@NOTE: NEEDs to be come befoure route it's convection
+😗@NOTE: NEEDs to be come befour route it's convection
 
 @INVITE_&_INSTALL:-> MORGAN,cookieParser,fileUpload,swaggerUi & some REGULAR MIDDLEWARE like json & urlencoded 
 
+-----------------NEW--------------------
+@SECTION: BASIC CONFIG & CONTROLLER 
+@TITLE: CUSTOM ERROR HANDLERS
+@ABOUT: All about Inject MIDDLEWARE
+@LOCATION: 🗃️utils/customError.js 
+@REF: ✈️🔗https://nodejs.org/api/errors.html#class-error
+@OVERVIEW:->
+-It an Node Js error Handling it's very POWERFUL
+-create error base on class & exports(Production use)
+-customize Error A/C to Ref Link 
+
+-----------------NEW--------------------
+@SECTION: BASIC CONFIG & CONTROLLER 
+@TITLE: THE Big PROMISE 
+@ABOUT: All About DB Connetion(Which Problebly take time) 
+@LOCATION: 🗃️middleware/bigPromise.js
+
+@OVERVIEW:
+-Concern About weather the Connetion Connect or Not to DB 
+-use funtional Programming 
+-In Order to Clear More Take Refference of LOCATION & visit file 
 
 
- 
 
 
 
-*/
+*/

middlewares/bigPromise.js

@@ -0,0 +1,15 @@
+module.exports = func => (req,res,next)=>{
+    Promise.resolve(func(req,res,next)).catch(next)
+}
+
+/*
+-🎗️Part Of Funtional Programming
+-🎗️Use Promise In Javascript which Handles asynchronous operations;
+-🎗️A promise is created using the Promise constructor which takes in a callback function with two parameters, resolve and reject respectively
+resolve:-> when the async operation has been successfully completed.
+reject :->  when the async operation fails or if some error occurs.
+-🎗️In case we use alternative .catch instead reject If anything bad then next back! 
+@FOLLOW_PROCES_&_CHOOSE_ONE 
+try catch async await || bigPromise
+-🎗️import in home CONTROLLER because promise expect one one function that is present on constroller that's MOTO 
+*/

utils/customError.js

@@ -0,0 +1,8 @@
+class CustomError extends Error {
+  constructor(message, code) {
+    super(message);
+    this.code = code;
+  }
+}
+
+module.exports = CustomError;