How do I add a password checking middleware in node js express

I am trying to make a middleware which displays a form which asks for a password to enter a route.

The problem is that I am in a get route and there is no way for me to pass the data in a get request because I do not want to pass the password in the url. So I tried to make a middleware which displays a form with hidden info like the id of what chat the customer wants to access which submits to another route (post). In the post route it checks if the password is correct and if it is goes back to the original route (get) and displays the chat.

Here's what I've done so far:

The GET route:

router.get('/chats/:id', middleware.isLoggedIn, middleware.isAllowed, catchAsync(async (req, res, next) => {
    const foundChat = await Chat.findOne({
      _id: req.params.id
    })
    console.log('here', foundChat)
    res.render('chat/show', {
      chat: foundChat
    })
}))

The POST route

router.post('/chats/password', middleware.askForPassword)

The middlewares

middleware.isAllowed = async function (req, res, next) {
  if (req.cookies.allowed) {
    if (req.cookies.allowed.includes(req.params.id)) {
      req.body.password = null
      return next()
    }
  } else {
    res.redirect('/chats/password')
  }
}
middleware.askForPassword = async function (req, res, next) {
  try {
    const hashedDBPassword = await Chat.findById(req.params.id)
    const password = req.body.password
    const passwordHashed = hashedDBPassword.password
    const cookieName = encodeURIComponent(hashedDBPassword.name)
    const resultCompare = await bcrypt.compare(password, passwordHashed)
    let value
    if (req.cookies.allowed === undefined) {
      res.cookie('allowed', [], {
        maxAge: 30000,
        httpOnly: true
      })
    }
    if (resultCompare === true) {
      value = req.cookies.allowed
      value.push(passwordHashed)
      res.cookie('allowed', value, {
        maxAge: 30000,
        httpOnly: true
      })
      res.redirect('/chats/' + req.body.id)
    } else {
      global.nextMiddleware = true
      res.render('chat/password', {
        id: req.body.id
      })
    }
  } catch (err) {
    console.log(err)
    res.redirect('/chats')
  }
}

The form

<% layout("layouts/boilerplate.ejs") %>
<form action="/chats/password" method="post">
<input type="password" name="password" id="password">
<input type="hidden" name="id" value="<%= id %>">
<input type="submit" value="Go!">
</form>

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