To refactor your login route for better stability and user experience, we will implement the Post/Redirect/Get (PRG) pattern. add return in front of each render resend. routes.
1
zfrika
The Refactored Logic Instead of res.render, we use res.redirect. This clears the "POST" request and sends the user to a "GET" route, which is much cleaner. ========= Why this caused the error Here is the play-by-play of the "Double Response": First Response: A user enters an email that isn't in your DB. Your code hits line 50 and renders emailnotfound. The Leak: Because there is no return, the code moves to line 57: const isPasswordMatch = await bcrypt.compare(...). The Crash: Since check is null/undefined, bcrypt.compare fails and throws an error. This sends the code straight to the catch block at line 111. Second Response: Line 111 calls res.send("wrong Details"). Node.js sees that you already sent a page at line 50 and throws the Headers Sent error. Pro-Tip: Clean Up your Logic To make your login route bulletproof, I recommend using return for every response: Line 62: return res.render("./newpost/userhomepage", ...) Line 107: return res.send("wrong password"); Line 111: return res.send("wrong Details"); Using return is a standard "best practice" in Express to prevent these exact types of production crashes. Would you like me to help you refactor this route to use a redirect instead of render for the successful login? (This is usually better for preventing users from re-submitting forms if they refresh the page).