URL: /rules/perf/js-libraries

---
title: "JS Libraries"
description: "Detects JavaScript libraries and checks for known vulnerabilities"
---

Detects JavaScript libraries and checks for known vulnerabilities

| | |
|---|---|
| **Rule ID** | `perf/js-libraries` |
| **Category** | [Performance](/rules/perf) |
| **Scope** | Per-page |
| **Severity** | warning |
| **Weight** | 5/10 |

## Solution

Keep JavaScript libraries updated to their latest versions. Outdated libraries may contain security vulnerabilities that attackers can exploit. Consider replacing large libraries like jQuery with modern vanilla JavaScript or smaller alternatives. Use npm audit or Snyk to monitor dependencies for vulnerabilities.

## Enable / Disable

### Disable this rule

```toml squirrel.toml
[rules]
disable = ["perf/js-libraries"]
```

### Disable all Performance rules

```toml squirrel.toml
[rules]
disable = ["perf/*"]
```

### Enable only this rule

```toml squirrel.toml
[rules]
enable = ["perf/js-libraries"]
disable = ["*"]
```