Security & Observability

What this module covers

5 steps · Next.js

1. Step 1. Lesson: Security & Observability

   Validate boundaries, protect secrets, apply secure headers and rate limits, log structured events, and monitor production failures. Learning objectives - Recognize when security & observability is the right tool. - Explain the role of validate, rateLimit, log. - Build a small working example before combining it with a larger interface. - Identify one accessibility, maintainability, or error-handling improvement. Read the example, predict what it will do, then complete the small change described in the check question.

   Validate boundaries, protect secrets, apply secure headers and rate limits, log structured events, and monitor production failures. In Next.js, make the state/interaction visible in the UI so completion is easy to verify.

   Check yourself: [Next.js] Use the example to demonstrate security & observability.

2. Step 2. Quiz: Security & Observability

   Check your understanding of Security & Observability.

   Credentials and secret tokens must never be written to logs. In Next.js, make the state/interaction visible in the UI so completion is easy to verify.

   Check yourself: [Next.js] Complete the knowledge check.

3. Step 3. Exercise: Security & Observability

   Threat-model a mutation route and add validation, authorization, rate limiting, safe errors, and structured logs.

   This exercise turns the Security & Observability lesson into a working code change. In Next.js, make the state/interaction visible in the UI so completion is easy to verify.

   Check yourself: [Next.js] Does the solution use validate and rateLimit and log?

4. Step 4. Review lab: Explain & improve Security & Observability

   Rebuild the exercise without copying the solution. Then improve it in two ways: make the code easier to understand and add one useful edge case, responsive behavior, accessibility improvement, or error state. Finally, write a short explanation of how validate, rateLimit, log work together.

   Rebuilding from memory and improving an edge case turns recognition into durable skill. In Next.js, make the state/interaction visible in the UI so completion is easy to verify.

   Check yourself: [Next.js] Does the improved version still use validate, rateLimit, log clearly?

5. Step 5. Mini project: Security & Observability

   Harden a deployed application with security headers, upload limits, audit logs, health checks, monitoring, and an incident checklist.

   The mini project combines the module lesson, quiz, and exercise into one portfolio-ready result. In Next.js, make the state/interaction visible in the UI so completion is easy to verify.

   Check yourself: [Next.js] Does the project apply the module's security & observability skills?