Production JavaScript checklist

Last reviewed May 28, 2026 Content v20260528

Track mode

client_javascript

Means

In-browser JS

Reading

~1 min

Level

advanced

This lesson

A recap and forward look: Production JavaScript checklist ties earlier JavaScript lessons together and points to what to study or build next.

Interviewers and code reviewers expect you to connect Production JavaScript checklist to real trade-offs—not only syntax.

You will apply Production JavaScript checklist in contexts like: Browsers, Node.js services, edge workers, and tooling ecosystems (bundlers, test runners).

Run JavaScript in the in-browser sandbox, use the terminal output panel, and verify with MCQs.

When intermediate lessons feel comfortable and you are ready for production-style trade-offs.

Shipping JS: bundle size, linting, testing, security headers, and observability.

Checklist

ESLint + Prettier in CI
Unit tests (Vitest/Jest) for pure logic
Minify and tree-shake production bundles
Content-Security-Policy and no secrets in client bundles
Error monitoring (Sentry, etc.)
Performance: lazy routes, image optimization

Security tie-in

Review OWASP intro for XSS, CSRF, and broken access control in apps you build.

Important interview questions and answers

Q: Why CSP?
A: Restricts script sources—mitigates XSS impact.
Q: Secrets in front-end?
A: Never—API keys in bundles are public.

Self-check

Name two tools for quality.
Why lazy-load routes?

Tip: Pair with /cybersecurity/intro for secure shipping habits.

Interview prep

CSP?: Content-Security-Policy restricts resource loading.

Playground

Runs in your browser in a sandboxed frame. Backend runners appear when this track’s profile allows them.

Discussion

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Starter discussion topics

What would you log to verify this behavior?
What breaks if you run this before the DOM is ready?

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