Node.js does not come with RPMs for CentOS 6.3. Here are instructions to build node rpms from source.
- sudo yum groupinstall 'Development Tools'
 - sudo yum install openssl-devel python
 - mkdir -p ~/rpmbuild/BUILD ~/rpmbuild/RPMS ~/rpmbuild/RPMS/i386 ~/rpmbuild/RPMS/noarch ~/rpmbuild/RPMS/x86_64 ~/rpmbuild/RPMS/ ~/rpmbuild/SOURCES ~/rpmbuild/SPECS ~/rpmbuild/SRPMS
 - echo '%_topdir %(echo $HOME)/rpmbuild' >> ~/.rpmmacros
 - wget -P ~/rpmbuild/SOURCES http://nodejs.org/dist/v0.10.20/node-v0.10.20.tar.gz
 - wget -P ~/rpmbuild/SPECS https://raw.github.com/jordanconway/node-rpm-spec/master/nodejs.spec
 - rpmbuild -ba ~/rpmbuild/SPECS/nodejs.spec
 - rm ~/.rpmmacros