Stop 04 · JavaScript & TypeScript for BackendTopics · 2/12
Async Patterns
Part of the Backend Developer Roadmap
In short
The practical patterns for structuring async backend code cleanly — sequential vs parallel awaits, error propagation, and avoiding callback hell in real route handlers.
How to learn this
- 1Refactor a route handler with multiple sequential awaits into parallel ones where possible.
- 2Write a reusable `asyncHandler` wrapper to catch errors in Express route handlers.
- 3Practice chaining dependent async calls (e.g. create user, then send welcome email) correctly.
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