Justice is a core value in Islamic teachings and serves as the foundational principle in Islamic business law. This study examines the concept of justice in Islamic business law, specifically within the context of modern contracts and transactions. Using a qualitative approach with normative and descriptive methods, the research classical Islamic legal principles and their application to contemporary practices such as smart contracts, cryptocurrency, and digital crowdfunding. Findings reveal that justice in Islamic business is not merely a moral imperative but an operational standard to ensure fairness, transparency, and balance in transactions. The study highlights the need for reinterpretation through contemporary ijtihad to address legal issues emerging from economic digitalization while remaining aligned with shariah. Additionally, the research underscores the role of regulators and Islamic financial institutions in promoting equitable business practices. Enhanced legal awareness and ethical literacy among Muslim entrepreneurs are also emphasized as key to ensuring just practices in the evolving business landscape. This study contributes to the dynamic understanding of Islamic law as a relevant legal system capable of responding to modern challenges without compromising its core values.Keywords : contract, digital transaction, Islamic business law, justice, shariah.

The increasing demand for electric vehicles (EVs) due to global warming and environmental issues necessitates specialized knowledge in this field. This research develops an electric motorcycle trainer kit designed to enhance learning in vocational high schools, specifically in the Electrical Engineering and Automotive departments. The research aimed to design and validate a trainer kit that accurately represents an electric motorcycle's electrical system, facilitating hands-on learning for students. The methodology involved data collection, product design, and implementation with validation by field experts. Results showed that the trainer kit significantly improved students' understanding and practical skills related to electric vehicle systems. In conclusion, the electric motorcycle trainer kit proved to be an effective educational tool, supporting the development of competencies required for the growing electric vehicle industry. Further improvements in the aesthetic and technical aspects of the kit could enhance its future applications.