Node.js Practical — Template rendering — Route/API Bug

Node.js Published Updated 0 Views Verified
Node.js Practical Debugging — Template rendering (Route/API Bug). The endpoint returns 404/500 or an unexpected response even though the controller exists. Trace the request path and show the corrected route/middleware/controller code. The specific area is EJS/Pug/Handlebars view not found. Assume a real Express/Node.js project where the developer needs a reliable, maintainable fix. Explain why the buggy version can fail, then provide corrected code and the expected behavior. Do not hide the root cause behind a generic 'restart the server' answer. BUGGY/PROBLEM CODE: app.get('/dashboard', (req, res) => { res.render('dashboard'); }); // dashboard.ejs

<%= user.name %>

TASK: Find the exact problem and write the production-safe correction.
Looking for the latest Sarkari Result 2026 updates? Check the latest government exam results, merit lists and result updates on Sarkari Resultess.
Sarkari Resultess
Questions & Answers

Answer & Explanation

4 Answers
Verified Correct Answer

Correct Code / Solution

app.get('/dashboard', (req, res, next) => { try { const user = req.user || { name: 'Guest' }; return res.render('dashboard', { user }); } catch (error) { return next(error); } }); // dashboard.ejs

<%= user.name %>

Additional Explanation
Root cause: EJS/Pug/Handlebars view not found. The important debugging step is to verify the exact runtime value, module path, middleware order, environment variable, database/model export, or asynchronous result before changing unrelated code. The corrected version adds explicit validation/error handling where appropriate. Expected behavior: the code should either complete the requested operation or return/log a controlled error instead of failing silently, returning undefined unexpectedly, or crashing the process.
Sarkari Resultess
Editorial Answer 1
Verified

Possible but Incorrect Code

app.get('/dashboard', (req, res, next) => { try { var user = req.user || { name: 'Guest' }; return res.render('dashboard', { user }); } catch (error) { return next(error); } }); // dashboard.ejs

<%= user.name %>

Additional Explanation
यह option जानबूझकर एक common bug/unsafe approach दिखाता है। इसे production solution के रूप में इस्तेमाल करने से पहले variable scope, async flow, module path, validation, error handling और security checks verify करें। ऊपर दिए गए correct option से exact difference compare करें.
Sarkari Resultess
Editorial Answer 2
Verified

Possible but Incorrect Code

app.get('/dashboard', (req, res, next) => { try { /* missing error handling */ const user = req.user || { name: 'Guest' }; return res.render('dashboard', { user }); } catch (error) { return next(error); } }); // dashboard.ejs

<%= user.name %>

Additional Explanation
यह option जानबूझकर एक common bug/unsafe approach दिखाता है। इसे production solution के रूप में इस्तेमाल करने से पहले variable scope, async flow, module path, validation, error handling और security checks verify करें। ऊपर दिए गए correct option से exact difference compare करें.
Sarkari Resultess
Editorial Answer 3
Verified

Possible but Incorrect Code

app.get('/dashboard', (req, res) => { res.render('dashboard'); }); // dashboard.ejs

<%= user.name %>

Additional Explanation
यह option जानबूझकर एक common bug/unsafe approach दिखाता है। इसे production solution के रूप में इस्तेमाल करने से पहले variable scope, async flow, module path, validation, error handling और security checks verify करें। ऊपर दिए गए correct option से exact difference compare करें.
Sarkari Resultess
Editorial Answer 4