The Node.js license is the MIT License, one of the most permissive open source licenses available. If your only question is "can I use Node.js in a commercial, closed-source product," the answer is straightforwardly yes — MIT imposes almost no obligations beyond keeping the copyright notice in distributed copies. The more consequential question, though, is what license terms apply to the dependencies your Node.js app pulls in from npm, because that is where most real license risk actually lives.
What License Does Node.js Itself Use?
Node.js is released under the MIT License, with some bundled components (V8, portions of OpenSSL, and other embedded libraries) carrying their own separate licenses — mostly BSD-style or similarly permissive terms. Practically speaking, this means:
- You can use Node.js in proprietary, closed-source commercial software without publishing your own code.
- You can modify Node.js and distribute your modified version.
- You are not required to pay royalties or seek permission.
- You do need to retain the original copyright and license notice if you redistribute Node.js itself (rare for typical app deployments, since most teams just run Node.js rather than redistribute the runtime).
For the vast majority of teams shipping a web service or CLI tool, the Node.js license itself is a non-issue.
Where the Real License Risk Lives: npm Dependencies
A typical Node.js application depends on dozens of direct packages and, once transitive dependencies are counted, often hundreds. Each one carries its own license — MIT and Apache-2.0 dominate the npm ecosystem, but GPL, LGPL, and the copyleft AGPL-3.0 show up often enough to matter, especially in packages that wrap native binaries or database drivers.
The risk shows up in a few specific ways:
- Copyleft contamination — a package under GPL or AGPL can, depending on how it's linked and used, obligate you to release your own source code or offer it to users who interact with your service over a network (the AGPL's specific trigger).
- License changes mid-stream — packages sometimes relicense between versions (the Elastic License and SSPL changes of the early 2020s are the widely cited examples), meaning a dependency that was permissive at pin time may not stay that way after an upgrade.
- Missing or ambiguous licenses — a surprising number of small npm packages ship without a clear
LICENSEfile orlicensefield inpackage.json, which technically leaves usage rights undefined. - Dual-licensed packages — some packages offer a free tier under one license and a commercial tier under another, and picking the wrong build can violate the terms without anyone noticing until an audit.
How to Actually Manage License Exposure in a Node.js App
Manually reading the license of every transitive dependency does not scale past a handful of packages. In practice, teams rely on automated license scanning integrated into CI, which flags disallowed license types (typically AGPL, SSPL, and other strong copyleft licenses) before a pull request merges, rather than during a legal review months later. A defined open source policy — which license categories are pre-approved, which require legal sign-off, and which are outright banned — turns this from an ad hoc judgment call into a repeatable gate.
npm ls --all combined with a license-checking tool (or an SCA platform's dependency graph) gives you the full picture of what's actually shipping, not just what's declared in your top-level package.json.
FAQ
Does the Node.js MIT license require me to open-source my app?
No. MIT is permissive and does not require you to release your own source code, even in a commercial product. This is unrelated to what your npm dependencies might require.
Can I use GPL-licensed npm packages in a proprietary Node.js app?
It depends on how the package is used and linked, and GPL terms are notoriously fact-specific. As a rule of thumb, treat any GPL or AGPL dependency as a flag for legal review rather than assuming it's safe by default.
How do I find out what license an npm package uses?
Check the license field in its package.json, or use a license-scanning tool that aggregates this across your full dependency tree, since manually checking hundreds of transitive packages isn't realistic.
Is Node.js license compliance a one-time check?
No — dependencies update, get replaced, and sometimes relicense entirely. License compliance for a Node.js app is an ongoing check, ideally automated in CI so new violations are caught before they ship rather than discovered during an audit.