env variables through different file and optimizing error handling with middleware

app/middleware/check-auth.js

@@ -1,15 +1,14 @@
-const jwt = require('jsonwebtoken');
+const jwt = require('jsonwebtoken'),
+	errorMaker = require('../helpers/error.maker');
 
 module.exports = (req, res, next) => {
 	try {
 		const token = req.headers.authorization.split(' ')[1];
 		const decoded = jwt.verify(token, process.env.JWT_KEY);
-		req.donorData = decoded; //for use till end of request
+		req.userData = decoded; //for use till end of request
 
 		next();
 	} catch (error) {
-		return res.status(401).json({
-			message: 'Auth failed'
-		});
+		return next(error);
 	}
 };