The Hidden Risks of Popular npm Packages: An Audit of 25 Leading Libraries
In the bustling ecosystem of Node.js, npm packages are the building blocks of countless applications. But how many of these widely-used libraries are truly secure? Recent supply chain attacks like the LiteLLM incident (March 2026) and the ua-parser-js compromise (October 2021, CVE-2021-41265/CVE-2021-41266) have highlighted the dangers of single points of failure. To shed light on this, I audited 25 of the most downloaded npm packages using a zero-install CLI tool—no installation, no API key, no account required. The results are eye-opening.
The Scoring Model
The tool assesses packages across five behavioral dimensions, all derived from public registry data. Each dimension has a maximum score, contributing to a total of 100 points:
- Longevity (max 25): Measures the package age—time in production signals reliability.
- Download Momentum (max 25): Evaluates weekly downloads and trend direction to gauge community trust.
- Release Consistency (max 20): Looks at cadence, recency, and gaps between updates.
- Maintainer Depth (max 15): Counts the number of active maintainers—more hands mean lower risk.
- GitHub Backing (max 15): Analyzes star traction and repository activity.
A CRITICAL risk flag is triggered when a package has only one maintainer and exceeds 10 million weekly downloads—the same profile as the LiteLLM and ua-parser-js compromises. This combination creates a single point of failure that attackers can exploit.
Results: 25 Packages Scored (Live Data, April 2026)
| Package | Score | Risk | Maintainers | Downloads/wk |
|---|---|---|---|---|
| webpack | 100 | ✅ SAFE | 8 | 44M |
| prettier | 100 | ✅ SAFE | 11 | 87M |
| typescript | 98 | ✅ SAFE | 6 | 178M |
| express | 97 | ✅ SAFE | 5 | 93M |
| dotenv | 93 | ✅ SAFE | 3 | 120M |
| jest | 95 | ✅ SAFE | 5 | 44M |
| tailwindcss | 95 | ✅ SAFE | 3 | 89M |
| fastify | 95 | ✅ SAFE | 5 | 6M |
| react | 91 | ✅ SAFE | 2 | 122M |
| eslint | 91 | ✅ SAFE | 2 | 125M |
| vite | 91 | ✅ SAFE | 4 | 105M |
| next | 91 | ✅ SAFE | 2 | 36M |
| prisma | 91 | ✅ SAFE | 2 | 10M |
| rollup | 99 | ✅ SAFE | 5 | 102M |
| drizzle-orm | 87 | ✅ SAFE | 4 | 7M |
| uuid | 82 | ✅ SAFE | 2 | 239M |
| esbuild | 88 | 🔴 CRITICAL | 1 | 190M |
| sharp | 84 | 🔴 CRITICAL | 1 | 51M |
| nodemon | 86 | 🔴 CRITICAL | 1 | 12M |
| hono | 82 | 🔴 CRITICAL | 1 | 34M |
| axios | 89 | 🔴 CRITICAL | 1 | 101M |
| zod | 83 | 🔴 CRITICAL | 1 | 158M |
| lodash | 87 | 🔴 CRITICAL | 1 | 145M |
| chalk | 75 | 🔴 CRITICAL | 1 | 413M |
| ts-node | 59 | ⚠️ WARN | 2 | — |
What Stands Out
esbuild: A Critical Single Point of Failure
With 190 million weekly downloads, esbuild is the bundler powering Vite, Next.js, and many other frameworks. Yet it has only one maintainer, Evan Wallace. While his engineering is exceptional, this creates a monumental blast radius. Compare that to TypeScript (178M downloads/wk, 6 maintainers) or webpack (44M downloads/wk, 8 maintainers). If Evan's npm token were compromised, the impact would ripple across half the JavaScript build toolchain.
Sharp: Image Processing with Native Risks
Sharp handles server-side image processing on ~51 million npm installs per week. It has one maintainer and relies on native bindings. A malicious version would be exceptionally hard to detect and could devastate production systems.
Chalk: The Biggest Exposure
Chalk leads the pack with 413 million weekly downloads—the most downloaded sole-maintained package on npm. Every CLI tool, build script, and logging framework likely depends on it. A single token compromise could introduce backdoors into countless projects.
The Safe Packages Earn Their Status
Packages like webpack (score 100, 8 maintainers, 15 years in production), prettier (100, 11 maintainers), and TypeScript (Microsoft-backed) demonstrate how maintainer depth and institutional support mitigate risk. These packages would survive a maintainer turnover or attack.
Conclusion: The Urgent Need for Maintainer Diversity
The audit reveals a troubling trend: many of the most critical npm packages are dangerously under-maintained. While the packages themselves are technically sound, their reliance on a single person makes them prime targets for supply chain attacks. The JavaScript community must prioritize maintainer depth—recruiting additional trusted contributors, implementing code ownership policies, and using tools like this audit to monitor risks. Until then, every one of these critical packages is one leaked token away from causing chaos.