How do I run multiple async operations in parallel in Node.js?
Use Promise.all to run independent async operations in parallel instead of awaiting each sequentially. This is often much faster, since the operations run concurrently instead of one after another.
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More FAQs in Best Practices for Async Code in Node.js
Use async/await for all new code. It is cleaner, easier to read, and easier to debug than callbacks. Reserve callbacks for EventEmitter and old APIs that use them, but write new code with async/await.
Always wrap async code in try/catch, or use .catch on promises. Add a global unhandled rejection handler as a safety net, since unhandled promise rejections crash the process in newer Node.js versions.
Use async/await to flatten nested callbacks, or use Promise.all for parallel operations. Nesting callbacks or awaited operations creates a pyramid that is hard to read and maintain, so flatten with modern patterns.
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