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How do you debug asynchronous JavaScript?

Senior JavaScript
Quick Answer Debug async JS: use Chrome DevTools async stack traces (shows the full async call chain), add breakpoints in async functions, use the Network tab for API request/response timing, add console.time/timeEnd around async operations, use Node.js --inspect for server-side async. The "Async" checkbox in DevTools sources panel shows where each async call was initiated.

Answer

  • Use browser DevTools async stack traces
  • Insert breakpoints in async code
  • Use VSCode/Node.js debugger
  • Log promise resolution paths
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