ZA | 25-SDC-July | Luke Manyamazi | Sprint 3 | Middleware Exercises

.gitignore

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+node_modules/

Middleware-custom/app.js

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+const express = require('express');
+const app = express();
+const PORT = 3000;
+
+// Middleware 1: Check username header
+app.use((req, res, next) => {
+  req.username = req.headers['x-username'] || null;
+  next();
+});
+
+// Middleware 2: Parse JSON and check if body is string array
+app.use((req, res, next) => {
+  if (req.method !== 'POST') return next();
+
+  let body = '';
+  req.on('data', chunk => {
+    body += chunk.toString();
+  });
+
+  req.on('end', () => {
+    try {
+      req.body = JSON.parse(body);
+    } catch (error) {
+      return res.status(400).send('Error: Invalid JSON');
+    }
+
+    // Simple array check
+    if (!Array.isArray(req.body)) {
+      return res.status(400).send('Error: Send a JSON array');
+    }
+
+    // Simple string check
+    for (let item of req.body) {
+      if (typeof item !== 'string') {
+        return res.status(400).send('Error: All items must be strings');
+      }
+    }
+
+    req.subjects = req.body;
+    next();
+  });
+});
+
+// POST endpoint
+app.post('/', (req, res) => {
+  const name = req.username ? `authenticated as ${req.username}` : 'not authenticated';
+  const count = req.subjects.length;
+  const word = count === 1 ? 'subject' : 'subjects';
+  const list = req.subjects.join(', ');
+
+  res.send(`You are ${name}.\n\nYou asked about ${count} ${word}: ${list}.`);
+});
+
+app.listen(PORT, () => {
+  console.log('Custom server started on port 3000');
+});