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Internet of Things (IoT) is about augmenting the existing power of the Internet beyond computers and smartphones to a whole range of other things, processes, and environments involving living or non-living species. It can bring life to the objects and enable them to communicate. This study presents the bibliometric analysis and science-mapping analysis on IoT. The data were extracted from the Web of Science (WoS) database from 1989–2019. In total 14,469 documents (articles, review, editorial material, proceedings, etc) were retrieved, which were further processed by VOSviewer software to perform advanced bibliometric analysis and science-mapping analysis. This research identifies the most productive or leading authors, countries, journals, institutions, keywords and to know their co-authorship pattern, co-citation pattern, bibliographic coupling pattern, the co-occurrence of keywords pattern in the research area of IoT. Results showed that Joel J.P.C Rodrigues was the most productive author, the People’s Republic of China was the most productive country, the Journal of EEE Access was the leading journal, Luigi Atzori was the most cited author. The main keywords more frequently occurred were Internet of things, and Internet, and Security. The analysis showed a collaboration relation between authors, countries and institutions. The visualizations conducted on this topic offer exploratory information on current status and trends on the scientific literature of IoT and provides insights for established and novice researchers in the understanding of this research topic.