To determine if a journal is peer-reviewed:
The h-index represents the productivity and the citation impact of an author. The index is based on the author's most cited papers and the number of citations that they have received in other publications.
To locate an author's h-index:
There are different metrics that can be used to rank journals. One widely used is the Impact Factor, which measures the frequency with which the average article in a journal has been cited in a particular year.
For most metrics, an individual measure doesn't mean much, but it can be used in comparison.