See the NPM docs and semver docs: ~version “Approximately equivalent to version”, will update you to all future patch versions, without incrementing the minor version. ~1.2.3 will use releases from 1.2.3 to <1.3.0. ^version “Compatible with version”, will update you to all future minor/patch versions, without incrementing the major version. ^2.3.4 will use releases from … Read more
It means that there are 23 packages in your package.json (or dependencies of packages in your package.json) that have reported vulnerabilities. If you own the code base you could try to update the dependencies to newer versions and hope that the authors have released new versions with the vulnerabilities fixed. If you don’t own the … Read more
As pointed out in this answer: Don’t worry it’s just warnings but not errors. The packages which you are installing require different minimal versions of node.js. But your version of node.js (0.12.0) is ok for them too