The study aims to analyze the comparative perspectives between Islamic Law and Indonesian Positive Law in the practices of online buying and selling (trading). This study uses a juridical and normative approach with a specification of descriptive-analytical research. The data comes from primary law, secondary law, and tertiary law, and the researcher used a qualitative method to analyse the data. The shift and development of offline-based buying and selling (trading) practices to online practices today has required special regulation in the Indonesian Positive Law. The absence of specific rules regarding the practice of online buying and selling indicates that these activities should be subjected to the existing positive Indonesian laws. The principle of freedom of making contracts in the Civil Code (KUH Perdata) provides freedom to make any trade agreements. For the sake of legal certainty in the execution of online buying and selling, the parties must refer to the provisions of the Civil Code, the Information and Electronic Transaction Law (ITE Law), and the Consumer Protection Law (UUPK Law) that are relevant to the trading practice. In addition to these provisions, Islamic Law within the scope of mu’amalah also provides guidelines for the practice of direct buying and selling, but not online buying and selling; however, Islamic law also provides freedom in mu’amalah. The existence of these provisions makes it interesting to conduct a comparative study on the principles of online trading practices from the perspectives of Islamic law and Indonesian positive law. Islamic Law considers it legal to conduct online buying and selling if the terms and conditions of buying and selling are fulfilled, if it provides benefits and negates harm, and if it does not conflict with Al-Qur’an and Al-Hadith, and if it can be designated as al-‘adatu muhakkamah (a custom which is defined as law). According to the Indonesian positive law, in principle, online trading is legal as long as it fulfills the provisions of trading, that is the fulfillment of the terms, elements, principles, rights, and obligations of the parties regulated in the provisions of the Civil Code, Information and Electronic Transaction’s Law, and Consumer Protection Law, along with providing legal assurance and protection for the parties.
Keywords: comparative study, online buying and selling, Islamic law, Indonesian positive law