This study explores the current challenges and future directions of Internet of Things (IoT) in supply chains, focusing on the drivers and barriers to its adoption. It starts with a review of 913 documents from the Web of Science, spanning 2009 - 2023, and narrows down to 408 relevant publications. Employing bibliometric analysis-descriptive, trend topic, conceptual, and network analyses-the research addresses the challenges at the intersection of IoT and supply chain. Findings highlight a surge in research from 2018, with worldwide contributions. The study identifies the 20 most active countries, top 10 journals, and key papers in the field. The result reveals a transition from studies predominantly focused on enhancing efficiency in the supply chain using IoT to an increased emphasis on resilience, particularly due to global disruptions like COVID-19, while also considering sustainability and digital transformation. Integrating machine learning and IoT to predict future conditions in supply chains marks also a novel approach. Based on the network analysis several critical challenges, including issues of security, privacy, inter- operability, standardization, scalability, and energy efficiency, are identified as obstacles to effective IoT integration. The research also points to blockchain technology as a promising solution for addressing these challenges, facilitating decentralized trust, and enhancing cybersecurity. Moreover, the study emphasizes IoT's capacity for real-time tracking of logistics, production, and agri-food supply chains. A SWOT analysis outlines critical factors for integrating IoT in supply chain management, providing policy recommendations for industry practitioners and a framework for further investigation into IoT's potential and challenges in supply chains.