I am trying to redirect the user to the home page after registering (which includes automatic login). However, I keep getting this error. I have no idea why this is happening, and I’ve been trying to fix it for two days. Your help will be greatly appeciate! :’)

Error:

Uncaught (in promise) SyntaxError: Unexpected token '<', "<!DOCTYPE "... is not valid JSON

Relevant code (i think):

// BACKEND registerController.ts

res.redirect('http://localhost:3000/')

.

// FRONTEND apiHandler.ts

const init = {
    method,
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(body)
};

const response = await fetch(`http://localhost:4000/api${endpoint}`, init);