error controller created

Author: Shreya-1305

Backend/app.js

@@ -3,6 +3,8 @@ const express = require('express');
 
 const morgan = require('morgan');
 const plantRouter = require('./routes/plantRoutes');
+const AppError = require('./utils/appError');
+const globalErrorHandler = require('./controllers/errorController');
 
 const app = express();
 
@@ -13,12 +15,11 @@ app.use(express.json());
 app.use('/api/plants', plantRouter);
 
 app.all('*', (req, res, next) => {
-  res.status(404).json({
-    status: 'fail',
-    message: `Can't find ${req.originalUrl} on this server`,
-  });
+  next(new AppError(`Can't find ${req.originalUrl} on this server`, 404));
 });
 
+app.use(globalErrorHandler);
+
 // const userRouter = express.Router();
 // app.use('/api/user', userRouter);
 

Backend/controllers/errorController.js

@@ -0,0 +1,8 @@
+module.exports = (err, req, res, next) => {
+  err.statusCode = err.statusCode || 500;
+  err.status = err.status || 'error';
+  res.status(err.statusCode).json({
+    status: err.status,
+    message: err.message,
+  });
+};

Backend/utils/appError.js

@@ -0,0 +1,12 @@
+class AppError extends Error {
+  constructor(message, statusCode) {
+    super(message);
+    this.statusCode = statusCode;
+    this.status = `${statusCode}`.startsWith('4') ? `fail` : `error`;
+    this.isOperational = true;
+
+    Error.captureStackTrace(this, this.constructor);
+  }
+}
+
+module.exports = AppError;