Predatory publishers are exploitative publishers charging excess publication fees to authors without offering the usual editorial and publishing support associated with legitimate journals. There isn't a definitive list of predatory publishers available.
Review red flags for recognizing predatory publishers:
Make sure that complete contact information for the publishers is available, including a street address, email, and a working telephone number. Try to verify this information.
Do a web search for the publisher and evaluate what you find.
Check to see if the journal has an ISSN (International Standard Serial Number).
Verify that the members of the editorial board are listed on the journal website with affiliations and contact information.
Evaluate to what degree they are experts in the field.
Determine that a standard article fee schedule is publicly available.
Sample a few articles form the journal to read and evaluate quality,
Search for article authors in Google Scholar or in library databases to see if they have written other articles.
Contact authors who have already published in this journal and ask them about their experience.
Peer Review Process
Make sure the journal's peer review process is clearly described on the website.