Cannot set headers after they are sent to the client

Question

Cannot set headers after they are sent to the client. This is my back-end side error after authentication post request.It looks like problem with headers. I\'m sorry for my

Answer 1

This is due to your code trying to send multiple responses from the authenticate function.

res.json ({ success: true, token: 'bearer ' + token }); // 1st Response
res.redirect("/users/user"); // 2nd Response

Remove one of them which you don't use.