licenseValidity

Enforces that the license property is valid.

✅ This rule is included in the package-json logical presets.

This rule checks that the license property is a string containing a valid SPDX license, “UNLICENSED”, or a note referencing a license file (e.g. “SEE LICENSE IN LICENSE.md”).

Examples

❌ Incorrect

{
  "license": "GPL3"
}

✅ Correct

{
  "license": "GPL-3.0-only"
}

When Not To Use It

If you don’t need compliance with npm’s license field specification, you can disable this rule. For example, if you use a different package manager that treats the field differently, this rule may not be correct for you.

Related Rules

• licensePresence - Enforces that the license property is present.

Further Reading

• npm: package.json > license
• SPDX Documentation

Equivalents in Other Linters

• ESLint: package-json/valid-license