How to Evaluate an npm Package - 2026 Edition Fri May 29 2026 • javascript npm security open-source Every time you run npm install , you are adding code that will execute in your production environment: code written by someone you have never met, with access to whatever your process can reach. It might touch your filesystem, make outbound network requests, read environment variables, or quietly exfiltrate data. You are, in effect, trusting a stranger with your infrastructure. Most developers manage this risk by checking two numbers: weekly downloads and GitHub stars. Neither tells you anything meaningful about whether a package is safe, maintained, or honest about what it does. Supply chain attacks have made this worse. Event-stream, ua-parser-js, node-ipc, xz utils — the pattern is consistent: a legitimate, widely-used package gets compromised, either through a maintainer being social-engineered, a typosquat, or a dependency buried three levels deep. The npm ecosystem, with its culture of small composable packages and deep transitive dependency trees, is a particularly attractive target. You can do everything right and still get hit through something you never directly installed. There is a newer variation worth knowing about. AI coding assistants hallucinate package names. They confidently suggest npm install some-plausible-sounding-package for packages that do not exist. Attackers monitor those hallucinations and register the names - a technique now called slopsquatting - so that when a developer follows the suggestion without checking, they install something malicious. If an LLM suggests a package you have never heard of, verify that it exists, has a real history, and has provenance before you run the install. None of this means you should stop using open source packages - that would make you less productive without making you meaningfully safer. What it means is that picking a package deserves more than a five-second glance at the star count. This guide gives you a repeatable process for evaluating an npm package before you add it. It takes 5–10 minutes. It won't guarantee safety - nothing will - but it will help you make an informed decision rather than an optimistic one. 1. Is it actively maintained? An unmaintained package is a liability that compounds over time. Security vulnerabilities go unpatched. Compatibility with newer Node versions breaks silently. The API freezes while the ecosystem moves on, and eventually you are pinned to an old version of something because updating it would require replacing a package nobody is touching anymore. The obvious signal is recent commits, but commit frequency alone is misleading. A package can have a commit last week that does nothing but update a CI action. What you are looking for is whether the author is still engaged with the actual software. What to check: On the GitHub repository, go to the Issues tab. Look at the oldest open issues, are they acknowledged? If someone reported a bug 18 months ago and the author has never replied, that tells you something about what the maintenance relationship looks like when things go wrong. Look at the Commits tab. Filter out bot commits and CI noise. When was the last time a human made a meaningful change to the source code, not just a dependency bump or a workflow tweak? On the npm page , go to the Versions tab. Is there a recognisable release cadence - monthly, quarterly, whatever - or a 2-year gap followed by a burst of activity? Long gaps followed by sudden updates are sometimes a red flag in themselves: accounts do get taken over. Check the CHANGELOG . If it just lists commit hashes, it is nearly useless. A changelog that says "Fixed: deduplication plugin now clones responses per waiter to prevent body-already-used errors" is a changelog written by someone who cares whether you understand what changed and why. The quality of the changelog is a proxy for how the author thinks about the people using their software. Finally, if the package exposes a public API that has changed over time, look for a migration guide. An author who documents breaking changes and provides an upgrade path is an author who thinks about the downstream cost of their decisions. 2. Can you trust what's actually published to npm? Maintenance is about the future. This section is about something more immediate: whether what is on the npm registry right now is actually what the author intended to publish. The npm registry has no verification by default. When you install a package, you are trusting that the bytes you receive match the source code you can read on GitHub. For most packages, most of the time, that is true. But the mechanism that links source to publish - an NPM_TOKEN stored as a CI secret, or sometimes just on a developer's laptop - is exactly the kind of credential that attackers target. The event-stream attack in 2018 is the clearest example: a maintainer handed over control of a popular package to a stranger. The stranger publishe...