I added "return" as specified and although the code performs as expected, I continue to get error messages in the consol

cards.js const express = require('express'); const router = express.Router(); const { data } = require('../data/flashcardData.json'); const { cards } = data;

router.get( '/', ( req, res ) => { const numberOfCards = cards.length; const flashcardId = Math.floor( Math.random() * numberOfCards ); res.redirect( /cards/${flashcardId} ) });

router.get('/:id', (req, res) => { const { side } = req.query; const { id } = req.params;

if ( !side ) {
    return res.redirect(`/cards/${id}?side=question`);
}
const name = req.cookies.username;
const text = cards[id][side];
const { hint } = cards[id];

const templateData = { id, text, name };

if ( side === 'question' ) {
  templateData.hint = hint;
  templateData.sideToShow = 'answer';
  templateData.sideToShowDisplay = 'Answer';
} else if ( side === 'answer' ) {
  templateData.sideToShow = 'question';
  templateData.sideToShowDisplay = 'Question';
}

res.render('card', templateData);

});

module.exports = router;

index.pug file extends layout.pug

block content section#content p a(href='/cards') Begin!

Error on Begin link: Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client at ServerResponse.setHeader (http_outgoing.js:455:11) at ServerResponse.header (/Users/julianna/Desktop/flashcards/node_modules/express/lib/response.js:771:10) at ServerResponse.send (/Users/julianna/Desktop/flashcards/node_modules/express/lib/response.js:170:12) at done (/Users/julianna/Desktop/flashcards/node_modules/express/lib/response.js:1008:10) at Object.exports.renderFile (/Users/julianna/Desktop/flashcards/node_modules/pug/lib/index.js:421:12) at View.exports._express as engine at View.render (/Users/julianna/Desktop/flashcards/node_modules/express/lib/view.js:135:8) at tryRender (/Users/julianna/Desktop/flashcards/node_modules/express/lib/application.js:640:10) at Function.render (/Users/julianna/Desktop/flashcards/node_modules/express/lib/application.js:592:3) at ServerResponse.render (/Users/julianna/Desktop/flashcards/node_modules/express/lib/response.js:1012:7

card.pug file extends layout.pug

block content section#content h2= text if hint p i Hint: #{hint} a(href=${id}?side=${sideToShow})= sideToShowDisplay br a(href='/cards') Next card

Error on Next card link: Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client at ServerResponse.setHeader (http_outgoing.js:455:11) at ServerResponse.header (/Users/julianna/Desktop/flashcards/node_modules/express/lib/response.js:771:10) at ServerResponse.send (/Users/julianna/Desktop/flashcards/node_modules/express/lib/response.js:170:12) at done (/Users/julianna/Desktop/flashcards/node_modules/express/lib/response.js:1008:10) at Object.exports.renderFile (/Users/julianna/Desktop/flashcards/node_modules/pug/lib/index.js:421:12) at View.exports._express as engine at View.render (/Users/julianna/Desktop/flashcards/node_modules/express/lib/view.js:135:8) at tryRender (/Users/julianna/Desktop/flashcards/node_modules/express/lib/application.js:640:10) at Function.render (/Users/julianna/Desktop/flashcards/node_modules/express/lib/application.js:592:3) at ServerResponse.render (/Users/julianna/Desktop/flashcards/node_modules/express/lib/response.js:1012:7)