Why use Promise.all in production Node.js?
To run multiple independent async operations in parallel instead of sequential awaits, which is often much faster for I/O-bound work. Promise.all completes when all operations finish, or rejects if any fails.
Verify This Answer
Cross-check this information using these trusted sources:
More FAQs in Async Best Practices in Node.js for Production Code
Always handle errors with try/catch and a global handler, use Promise.all for parallel operations, keep the event loop non-blocking with async APIs, use async/await over callbacks, clean up resources, use streams for large data, and test both success and error paths.
Because forgetting to close database connections, file handles, and event listeners causes memory leaks and resource exhaustion over time, which degrades production performance and can cause crashes. Always clean up in finally blocks or with proper teardown.
Because async bugs are subtle. Testing only the happy path misses error handling bugs that only appear in production when the API fails. Mock a rejected promise to test error handling and confirm it works before users hit it.
Still have questions?
Browse all our FAQs or reach out to our support team