Are you reviewing different journals to decide which one to submit for peer review? As follows are some indicators that may provide clues as to unsuitable journals for publication or review.
If in doubt, ask a mentor or colleague or a librarian.
Shamseer L, Moher D, Maduekwe O, Turner L, Barbour V, Burch R, Clark J, Galipeau J, Roberts J, Shea BJ. Potential predatory and legitimate biomedical journals: can you tell the difference? A cross-sectional comparison. BMC Med. 2017 Mar 16;15(1):28. doi: 10.1186/s12916-017-0785-9. "From our findings, we have developed a list of evidence-based, salient features of suspected predatory journals (Table 10) that are straightforward to assess; we describe them further below. We recognize that these criteria are likely not sensitive enough to detect all potentially illegitimate, predatory journals. However, we feel they are a good starting point."
Table 10: Salient characteristics of potential predatory journals