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Security documented here is what exists. Sportz has no authentication, so this page covers the layers that are built (input validation, rate limiting, headers, secrets, transport) and is explicit about what isn’t.

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Defense layers (what’s built)

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Input validation: Zod

Every request body and query is parsed with a Zod schema before any logic runs. Invalid input returns 400 with structured issue details and never reaches the database. This also closes the door on a class of injection by rejecting malformed shapes early. See the validation schemas in Backend.

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SQL injection: Drizzle parameterization

All queries go through Drizzle ORM, which uses parameterized queries: user input is never string-concatenated into SQL. The one place raw SQL appears (TRUNCATE in the test reset helper) takes no user input.

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Rate limiting & bots: Arcjet

Arcjet runs on both the HTTP path and the WebSocket upgrade:
  • Shield: common attack patterns.
  • Bot detection: blocks automated traffic (allows search engines / previews).
  • Sliding window: 50 req/10s on HTTP; 5 connections/2s on WS upgrades.
A denied request gets 429 (rate limit) or 403 (other). If Arcjet itself errors, the HTTP path fails closed (503). Arcjet is mocked in tests so the suite is fast and offline (see Testing).

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Secure headers: Helmet

helmet() sets a baseline of secure response headers (HSTS, no-sniff, frame options, etc.) on every Express response.

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Transport security: TLS

Production talks to Neon Cloud over verified TLS (rejectUnauthorized: true). The three-way SSL strategy (Cloud verified / Local self-signed / plain-Postgres off) is in Backend and was the subject of a real bug (Issues).

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Secrets & environment variables

  • Secrets (DATABASE_URL, ARCJET_KEY) are never committed: .env* is gitignored; only .env.*.example templates are tracked.
  • In production they’re injected via Render dashboard (sync: false in render.yaml), not baked into the image.
  • In CI they’re GitHub Actions secrets.

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Dependency security

npm audit surfaces known vulnerabilities; CI installs with npm ci for reproducible, lockfile-pinned installs.

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Honest gaps (not built)

The biggest security caveat: there is no auth. Anyone who can reach the API can create matches and commentary. That is acceptable for a demo/portfolio platform but would be the first thing to add before any real multi-user deployment.