Major.Minor.Patch, ^=minor, ~=patch

Semantic Versioning (SemVer)

The default versioning method in npm. Version numbers mean something!

"package": "MAJOR.MINOR.PATCH"

Definitons

MAJOR - Increment this when making backwards-incompatible API changes
MINOR - Increment this when you add functionality that’s backwards-compatible
- Prefixing dependencies with ”^” allows npm to use the most recent MINOR release
PATCH - Increment this when you’re doing bugfixes (and bugfixes shall be backwards-compatible)
- Prefixing dependencies with ”~” allows npm to use the most recent PATCH release