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Vibe codingMediumvc-g564
Subject Ai code reviewLevel Entry–Mid~13 minCommon in Algorithms & data structures interviewsIndustries Software development

Question

An AI agent wrote this Node.js route to let users download files from a per-user uploads folder. It works for normal filenames. What input would let a user read files they shouldn't, and how do you fix it on review?

js
const path = require('path');router.get('/files/:name', (req, res) => {  const filePath = path.join('/srv/uploads', req.params.name);  res.sendFile(filePath);});
What a strong answer looks like

Treat the AI’s output as a draft to verify, not an answer to trust. Name the specific flaw and the input that triggers it, say how you’d catch it — tests, edge cases, reading critically — and how you’d re-prompt or decompose to get it right.

Learn the concepts
Describe your solution

Vibe coding: describe the solution in plain language (or narrate it) and the coach grades your approach. Generating runnable code from your description is coming next.

Run or narrate your approach, then ask the coach.