ch-Add a global error handler middleware

src/index.ts

@@ -4,6 +4,7 @@ import dotenv from "dotenv";
 import router from "./routes";
 import { addDocumentation } from "./startups/docs";
 
+import {CustomError,errorHandler} from "./middlewares/errorHandler";
 dotenv.config();
 
 export const app = express();
@@ -12,11 +13,18 @@ app.use(express.json());
 
 app.use(cors({ origin: "*" }));
 
+app.all('*', (req: Request,res: Response,next) =>{
+    const error = new CustomError(`Can't find ${req.originalUrl} on the server!`,404);
+    error.status = 'fail';
+    next(error);
+})
+
 addDocumentation(app);
 app.get("/api/v1", (req: Request, res: Response) => {
   res.send("Knights Ecommerce API");
 });
 app.use(router)
+app.use(errorHandler);
 export const server = app.listen(port, () => {
     console.log(`[server]: Server is running at http://localhost:${port}`);
 })

src/middlewares/errorHandler.ts

@@ -0,0 +1,30 @@
+import { Request, Response, NextFunction } from 'express';
+
+class CustomError extends Error {
+    statusCode: number;
+    status: string;
+
+    constructor(message: string, statusCode: number) {
+        super(message);
+        this.statusCode = statusCode;
+        this.status = `${statusCode}`.startsWith('4') ? 'fail' : 'error';
+        Error.captureStackTrace(this, this.constructor);
+    }
+}
+
+const errorHandler = (
+    err: CustomError,
+    req: Request,
+    res: Response,
+    next: NextFunction
+) => {
+    err.statusCode = err.statusCode || 500;
+    err.status = err.status || 'error';
+    res.status(err.statusCode).json({
+        status: err.statusCode,
+        message: err.message
+    });
+    console.error(err.stack);
+};
+
+export { CustomError, errorHandler };