Async/Await Patterns in JavaScript

Async/await makes asynchronous code readable. Here's how to use it effectively and avoid common pitfalls.

Best Practices#

Error Handling:
✓ Always handle potential errors
✓ Use try-catch for async functions
✓ Propagate errors appropriately
✓ Provide meaningful error messages

Performance:
✓ Use Promise.all for parallel operations
✓ Avoid unnecessary awaits
✓ Consider Promise.allSettled for resilience
✓ Implement timeouts for external calls

Code Quality:
✓ Keep async functions focused
✓ Extract common patterns (retry, timeout)
✓ Use TypeScript for better type safety
✓ Avoid mixing callbacks and async/await

Async/await simplifies asynchronous code but requires understanding of underlying Promises. Use parallel execution when possible, handle errors properly, and implement patterns like retry and timeout for resilient applications. Avoid common pitfalls like forgetting await or using forEach with async callbacks.

Async/Await Patterns in JavaScript

Basic Usage#

Error Handling#

Parallel Execution#

Racing and Timeouts#

Sequential Processing#

Controlled Concurrency#

Retry Pattern#

Common Pitfalls#

Best Practices#

Conclusion#

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