There is no one source for this information, nor are there universal standards.
Check a journal's website for editorial information or ask the publisher if you have questions about a specific journal. Please note that individual publishers may define "peer-reviewed" in different ways.
To limit to peer-reviewed in CINAHL (and a few other EBSCO databases), go to Advanced Search and check the Peer Reviewed box under Limit your results. In MGH OneSearch, the limit is identified as Scholarly (Peer Reviewed) Journals.