Database:
Journal Citation Reports
Clarivate Analytics / Thomson Reuters

Journal Citation Reports is a tool that allows you to evaluate and compare journals using citation data. The data are drawn from over 7,000 scholarly and technical journals from more than 3,300 publishers in over 60 countries. JCR includes data about most specialties in the areas of science, technology, and medicine. You can see the most frequently cited journals in a field, highest-impact journals in a field, "hottest" journals in a field, leading journals in a field, and the most published articles in a field.