---
title: "The Invisible JavaScript Backdoor"
url: https://daily.dev/posts/the-invisible-javascript-backdoor-sr2jeuwev
source_url: https://css-tricks.com/the-invisible-javascript-backdoor/
type: article
source: "CSS-Tricks"
published: 2021-12-08T16:39:51.267Z
updated: 2021-12-08T16:39:51.267Z
tags: ["general-programming", "javascript"]
reading_time: 1
upvotes: 104
comments: 7
language: en
---

> ## Documentation Index
> Fetch the complete documentation index at: https://daily.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# The Invisible JavaScript Backdoor

**[CSS-Tricks](https://daily.dev/sources/css_tricks)** · 1 min read · 104 upvotes · 7 comments

## Summary

An interesting (scary) trick of an nearly undetectable exploit. Wolfgang Ettlinger: What if a backdoor literally cannot be seen and thus evades detection even from thorough code reviews?I’ll post the screenshot of the exploit from the post with the actual exploit circled.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://css-tricks.com/the-invisible-javascript-backdoor/>

## Community discussion

Top comments from developers on daily.dev.

**@lorezz** · 1 upvotes

> Mind the invisible gap

**@juanfrank77** · 1 upvotes

> Moral of the story: Use a real backend language instead of Javascript for those cases.

**@wallysomoura** · 0 upvotes

> great

**@xialvjun** · 0 upvotes

> I support to forbid those invisible characters in code. I used to come across a bug from it.

**@gustavocardosio** · 0 upvotes

> the crazy

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---

Tags: [#general-programming](https://daily.dev/tags/general-programming), [#javascript](https://daily.dev/tags/javascript)

[View this post on daily.dev](https://daily.dev/posts/the-invisible-javascript-backdoor-sr2jeuwev)