snippetjavascriptTip

How to secure your JavaScript code from vulnerable dependencies

Submitted by: @import:30-seconds-of-code·Mar 2, 2026·

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javascriptfromhowyourdependenciessecurecodevulnerable

Problem

Given the recent npm supply chain attack that compromised chalk, I thought it would be a good idea to take a look into how to secure your JavaScript code from vulnerable dependencies. After some relatively light research, I found a few actionable tips that could be of use to many developers.
> [!IMPORTANT]
>
> I am by no means a security expert. This is just a summary of what I found after a little bit of research. If you are a security expert and find any mistakes, please let me know!
Regularly scan your project for known vulnerabilities using automated tools. The npm CLI provides a built-in auditing command:

Solution

## Use trusted sources

Only install **packages from reputable maintainers and sources**. Before adding a new dependency, check its download count, review its code, and verify the maintainer's reputation. Avoid packages with suspicious activity, few contributors, or poor documentation.

For example, you can inspect a package with:

>
> I am by no means a security expert. This is just a summary of what I found after a little bit of research. If you are a security expert and find any mistakes, please let me know!
Regularly scan your project for known vulnerabilities using automated tools. The npm CLI provides a built-in auditing command:
This will report any security issues in your dependencies. For continuous monitoring, consider integrating tools like Snyk or Dependabot into your workflow. These can automatically check for and alert you to new vulnerabilities.
> [!TIP]
>

Code Snippets

## Use trusted sources

Only install **packages from reputable maintainers and sources**. Before adding a new dependency, check its download count, review its code, and verify the maintainer's reputation. Avoid packages with suspicious activity, few contributors, or poor documentation.

For example, you can inspect a package with:

> [!CAUTION]
>
> In this case, the supply chain attack _did_ indeed come from a reputable dependency (`chalk`), so use this advice as part of a broader strategy, not as a sole safeguard.

## Minimize dependencies

**Keep your dependency footprint as small as possible**. Every additional package increases your attack surface. Remove unused dependencies and prefer built-in language features or your own code for simple tasks.

To identify and remove unused dependencies:

Or use tools like [depcheck](https://www.npmjs.com/package/depcheck) to find unused packages. Additionally, if you only need a small part of a large library, consider importing just that part instead of the whole package, looking for a modular alternative, or writing a small utility function yourself.

## Review transitive dependencies

Your direct dependencies may pull in many others. Regularly **inspect your full dependency tree** to spot risky packages. Use:

Context

From 30-seconds-of-code: how-to-secure-your-js-code-from-vulnerable-dependencies

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