---
title: "Discussion on \"Understanding asyncHandler in Express.js (with Higher Order Functions)\" | Hashnode"
description: "Discussion on \"Understanding asyncHandler in Express.js (with Higher Order Functions)\". ❓ The Problem with Async Route Handlers\n\nExpress catch synchronous error automatically, but it doesn’t catch error thrown inside async functions.\n\nrouter.post(\"/login\", async (req, res) => {\n  const user = await User.findOne({ email: req.body.email }..."
url: "https://hashnode.com/posts/understanding-asynchandler-in-expressjs-with-higher-order-functions/6943ff55325c97388599126a"
---

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# [Understanding asyncHandler in Express.js (with Higher Order Functions)](https://javascript-higher-order-function-hof.hashnode.dev/understanding-asynchandler-in-expressjs-with-higher-order-functions?utm_source=hashnode&utm_medium=feed)

❓ The Problem with Async Route Handlers Express catch synchronous error automatically, but it doesn’t catch error thrown inside async functions. router.post("/login", async (req, res) => { const user = await User.findOne({ email: req.body.email }...

Dec 18, 2025 · 2 min read · javascript-higher-order-function-hof.hashnode.dev  
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