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JavaScript Express Basics Parameters, Query Strings, and Modularizing Routes Linking Around the Application

This doesnt work

I followed chalkers directions, I even copied the code from the project files into visual code, and it hangs when trying to load cards. please help:

Here's my App.js:

const express = require('express'); const bodyParser = require('body-parser'); const cookieParser = require('cookie-parser');

const app = express();

app.use(bodyParser.urlencoded({ extended: false})); app.use(cookieParser());

app.set('view engine', 'pug');

const mainRoutes = require('./routes'); const cardRoutes = require('./routes/cards');

app.use(mainRoutes); app.use('/cards', cardRoutes);

app.use((req, res, next) => { const err = new Error('Not Found'); err.status = 404; next(err); });

app.use((err, req, res, next) => { res.locals.error = err; res.status(err.status); res.render('error'); });

app.listen(3000, () => { console.log('The application is running on localhost:3000!') });

and 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}?side=question ) });

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

const templateData = { id, text };

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;

and Index.JS:

const express = require('express'); const router = express.Router();

router.get('/', (req, res) => { const name = req.cookies.username; if (name) { res.render('index', { name }); } else { res.redirect('/hello'); } });

router.get('/hello', (req, res) => { const name = req.cookies.username; if (name) { res.redirect('/'); } else { res.render('hello'); } });

router.post('/hello', (req, res) => { res.cookie('username', req.body.username); res.redirect('/'); });

router.post('/goodbye', (req, res) => { res.clearCookie('username'); res.redirect('/hello'); });

module.exports = router;

Here's my PUG Card:

extends layout.pug

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

and before you ask, Yes the data file is in the correct place, and everything else was copied exactly.

3 Answers

After tedious scrubbing of the Treehouse forums, I figured it out.

I did not indent properly ion my Card.pug file. Here is how I previously had it:

extends layout.pug

block content
        h2= text
        if hint
                i Hint: #{hint}
         a(href=`${id}?side=${sideToShow}`)= sideToShowDisplay

here''s how I had it after fixing it:

extends layout.pug

block content
        h2= text
        if hint
                i Hint: #{hint}
        a(href=`${id}?side=${sideToShow}`)= sideToShowDisplay

it' just barely noticable, but I had about one or two characters worth of spacing BEFORE the "a(href=${id}?side=${sideToShow})= sideToShowDisplay"

and it was breaking my whole thing.

So sad, yet so simple . . . Oh well, it's fixed now.

Shout out to this person:

nguoisechia binnary on Oct 23, 2017 You probably haven't indent correctly of every line in the PUG file.

From this thread:


Thanks for posting your solution. It's a good reminder that syntax is important and easy to miss (especially when it's just spacing)!

here is the error i'm getting in my console. It isn't helping me:

RangeError: Invalid status code: undefined at ServerResponse.writeHead (http_server.js:190:11) at ServerResponse._implicitHeader (_http_server.js:181:8) at write (http_outgoing.js:635:9) at ServerResponse.end (_http_outgoing.js:754:5) at ServerResponse.send (C:\Users\Cory\desktop\Code Louisville\flashcards\node_modules\express\lib\response.js:221:10) at done (C:\Users\Cory\desktop\Code Louisville\flashcards\node_modules\express\lib\response.js:1004:10) at Object.exports.renderFile (C:\Users\Cory\desktop\Code Louisville\flashcards\node_modules\pug\lib\index.js:422:12) at View.exports._express [as engine] (C:\Users\Cory\desktop\Code Louisville\flashcards\node_modules\pug\lib\index.js:465:11) at View.render (C:\Users\Cory\desktop\Code Louisville\flashcards\node_modules\express\lib\view.js:135:8) at tryRender (C:\Users\Cory\desktop\Code Louisville\flashcards\node_modules\express\lib\application.js:640:10)

Mary Paul
Mary Paul
13,792 Points

Read through everything and STILL didn't think it was the pug file. Your solution fixed it. Thanks a bunch.