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Bug Log

2026-07-14 — Server fails to start: Cannot find module 'music-tempo'

Problem npm start / node --import dotenv/config server.js crashed immediately with:

Error: Cannot find module 'music-tempo'
Require stack:
- audioAnalysis.js

The app never got past startup, so nothing built or ran.

Diagnosis

  1. Confirmed there's no build script in package.json — this is a plain Node/Express app with no build step, so "not building" meant the server process itself was crashing on start.
  2. Ran the start command directly (node --import dotenv/config server.js) to capture the raw error instead of relying on npm start output.
  3. Error pointed to audioAnalysis.js:5 requiring music-tempo.
  4. Checked node_modules — music-tempo was listed in package.json dependencies but the folder was missing from node_modules (only 85 packages present).
  5. Checked .gitignore and recent git log — node_modules/ had previously been accidentally committed, then removed from tracking (76f1d51 somehow node_modules got committed, removing, b75e771 Remove node_modules from tracking). That cleanup likely left a stale/incomplete node_modules on disk missing this package.

Fix Ran npm install, which added the missing music-tempo package (1 package added, 88 audited). Re-ran the server and confirmed clean startup:

Project Posterity running at http://localhost:3000

Follow-up / not yet addressed npm audit reports 4 vulnerabilities (3 moderate, 1 high) — not investigated yet.