---
title: "Discussion on \"Synchronous vs Asynchronous JavaScript: The Single Thread Bottleneck\" | Hashnode"
description: "Discussion on \"Synchronous vs Asynchronous JavaScript: The Single Thread Bottleneck\". JavaScript has exactly one thread to do everything. Here is how it handles heavy lifting without freezing the browser."
url: "https://hashnode.com/posts/synchronous-vs-asynchronous-javascript/6a00bf55e3eebc2e20abd4f3"
---

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# [Synchronous vs Asynchronous JavaScript: The Single Thread Bottleneck](https://blog.himanshubalani.com/synchronous-vs-asynchronous-javascript?utm_source=hashnode&utm_medium=feed)

JavaScript has exactly one thread to do everything. Here is how it handles heavy lifting without freezing the browser.

May 10 · 5 min read · blog.himanshubalani.com  
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-   [#asynchronous](https://hashnode.com/tag/asynchronous)
-   [#javascript](https://hashnode.com/tag/javascript)

## Written by

[Himanshu Balani](https://hashnode.com/@himanshubalani)

@himanshubalani · Nagpur, IN

  
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