Node.js Communication & Stakeholder Relations 5

Question 1

A stakeholder escalates that your Node.js API's error messages expose internal file paths. What is the correct fix?

Accepted Answer

Catch errors and return sanitized messages in production, stripping stack traces from responses

Answer

In production, middleware should catch errors and return generic messages, with full stack traces written only to server-side logs.

Question 2

Your team is adopting GraphQL subscriptions in Node.js. How do you explain the communication model to a REST-accustomed stakeholder?

Accepted Answer

Subscriptions maintain a persistent connection (via WebSocket) and push data to clients when server-side events occur

Answer

GraphQL subscriptions use WebSocket connections to push real-time updates to subscribed clients when relevant data changes.

Question 3

A team lead wants to ensure Node.js service errors are centrally tracked. Which integration is the industry standard?

Accepted Answer

Integrate an error tracking service like Sentry using its Node.js SDK to capture and report exceptions

Answer

Sentry and similar APM tools automatically capture, group, and alert on Node.js exceptions with full context, enabling rapid response.

Question 4

A client integration requires your Node.js service to support CORS for cross-origin browser requests. What do you implement?

Accepted Answer

Use the 'cors' npm middleware to set appropriate Access-Control-Allow-Origin headers

Answer

The 'cors' package configures CORS headers to permit specific or all origins, enabling browser-based cross-origin API access.

Question 5

A project manager asks how your Node.js service handles a downstream API that's temporarily unavailable. What pattern best communicates resilience?

Accepted Answer

The circuit breaker pattern — after N failures the service fast-fails and retries after a cooldown period

Answer

The circuit breaker pattern prevents cascade failures by short-circuiting calls to failing dependencies and allowing recovery time.

Node.js Practice Test