utils code discussion

.env.sample

@@ -1,2 +1,3 @@
 PORT=8000
-MONGODB_URI=mongodb+srv://hitesh:[email protected]
+MONGODB_URI=mongodb+srv://hitesh:[email protected]
+CORS_ORIGIN=*

package.json

@@ -19,6 +19,8 @@
     "prettier": "^3.0.3"
   },
   "dependencies": {
+    "cookie-parser": "^1.4.6",
+    "cors": "^2.8.5",
     "dotenv": "^16.3.1",
     "express": "^4.18.2",
     "mongoose": "^8.0.0"

src/app.js

@@ -0,0 +1,18 @@
+import express from "express"
+import cors from "cors"
+import cookieParser from "cookie-parser"
+
+const app = express()
+
+app.use(cors({
+    origin: process.env.CORS_ORIGIN,
+    credentials: true
+}))
+
+app.use(express.json({limit: "16kb"}))
+app.use(express.urlencoded({extended: true, limit: "16kb"}))
+app.use(express.static("public"))
+app.use(cookieParser())
+
+
+export { app }

src/index.js

@@ -9,6 +9,14 @@ dotenv.config({
 
 
 connectDB()
+.then(() => {
+    app.listen(process.env.PORT || 8000, () => {
+        console.log(`⚙️   Server is running at port : ${process.env.PORT}`);
+    })
+})
+.catch((err) => {
+    console.log("MONGO db connection failed !!! ", err);
+})
 
 
 

src/utils/ApiError.js

@@ -0,0 +1,24 @@
+class ApiError extends Error {
+    constructor(
+        statusCode,
+        message= "Something went wrong",
+        errors = [],
+        statck = ""
+    ){
+        super(message)
+        this.statusCode = statusCode
+        this.data = null
+        this.message = message
+        this.success = false;
+        this.errors = errors
+
+        if (statck) {
+            this.stack = statck
+        } else{
+            Error.captureStackTrace(this, this.constructor)
+        }
+
+    }
+}
+
+export {ApiError}

src/utils/ApiResponse.js

@@ -0,0 +1,8 @@
+class ApiResponse {
+    constructor(statusCode, data, message = "Success"){
+        this.statusCode = statusCode
+        this.data = data
+        this,message = message
+        this.success = statusCode < 400
+    }
+}

src/utils/asyncHandler.js

@@ -0,0 +1,27 @@
+const asyncHandler = (requestHandler) => {
+    (req, res, next) => {
+        Promise.resolve(requestHandler(req, res, next)).catch((err) => next(err))
+    }
+}
+
+
+export {asyncHandler}
+
+
+
+
+// const asyncHandler = () => {}
+// const asyncHandler = (func) => () => {}
+// const asyncHandler = (func) => async () => {}
+
+
+// const asyncHandler = (fn) => async (req, res, next) => {
+//     try {
+//         await fn(req, res, next)
+//     } catch (error) {
+//         res.status(err.code || 500).json({
+//             success: false,
+//             message: err.message
+//         })
+//     }
+// }