Production & Tooling — Chapter Quiz

Question 1

1

What is node --test?

AA linterBThe built-in test runner shipped with NodeCA dependency checkDA type checker

Node 18+ ships a test runner. Zero-dep, perfectly fine for libraries and CLI tools.

Question 2

2

Which is the best logging format for production?

APlain console.log stringsBStructured JSON, line-delimited (ndjson) — e.g. via pinoCXMLDBinary

Structured JSON is grep-able, parse-able, and ingest-able by log services. Plain strings are not.

Question 3

3

Every production Node app should set up an error tracker like Sentry.

TTrueFFalse

You can't fix what you can't see. Sentry (or similar) captures uncaught exceptions with full context — invaluable.

Question 4

4

What signal does Docker send to stop a container gracefully?

ASIGINTBSIGTERMCSIGKILLDSIGHUP

Docker sends SIGTERM first. After a grace period (default 10s) it sends SIGKILL. Handle SIGTERM for graceful shutdown.

Question 5

5

Why use multi-stage Docker builds for Node?

AThey are faster to buildBSmaller final image, dev deps excluded, no build tools shippedCThey support multiple Node versionsDNo specific benefit

Build deps live in stage 1 (which is thrown away). Stage 2 copies only the built artifact + prod deps → tiny final image.

Question 6

6

One line of middleware that sets ~12 security headers: app.use(___()).

helmet sets CSP, HSTS, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, and more — all by default.

Question 7

7

What should a /healthz endpoint do?

AReturn 200 quickly — used by load balancers to detect livenessBRun integration testsCRestart the processDReturn server stats

Health checks return 200 if the process is alive. A separate /readyz can do a deeper check (DB, dependencies).

Question 8

8

Which are valid PRACTICAL security wins for a new Node app?

Select all that apply.

Ahelmet for security headersBbcrypt/argon2 for passwordsCParameterized SQL — never concat user inputDValidate input with ZodELog everything including secrets

Never log secrets. The other four are all standard production hygiene.

Test what you learned.