Handle startup errors and harden notes loading

[ni0520]

Motivation

• Prevent application crashes and confusing errors when notes.json contains invalid data.
• Provide a clear, actionable message and graceful exit when the configured port is already in use.

Description

• Hardened notes loading by parsing notes.json into parsedNotes and using notes = Array.isArray(parsedNotes) ? parsedNotes : [] to ensure notes is always an array.
• Replaced app.listen(...) with a server object and added an error handler that specifically checks for EADDRINUSE, logs a clear instruction, and exits with code 1.
• All other behaviors (routes and note persistence via saveNotes) are preserved.

Testing

• Confirmed node is present with node -v and started the app using node index.js, then validated routes returned 200 for /, /notes, and /notes/new using curl.
• Performed a POST to /notes and observed a 302 redirect to confirm note creation flow.
• Simulated a port collision by launching a second instance and verified the second process logs Port 3000 is already in use... and exits with status 1.

---

Codex Task

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
code	Ready	Preview, Comment	Feb 19, 2026 8:58am
code-nq2m	Ready	Preview, Comment	Feb 19, 2026 8:58am

[ni0520]

Ok

[ni0520]

Ok