With increasingly sophisticated technological developments, all sales and purchase transactions can be carried out online through various platforms including websites, social media, e-commerce and other platforms. However, online transactions can cause legal problems. One of the legal problems that often involves the sale and purchase agreement between the seller and the buyer is a breach of contract. Court Decision Number 629/Pdt.G/2020/PN Jkt.Sel is one of the cases of online sale and purchase breach involving Celvin as the buyer as the Plaintiff with Satrya as the owner of the brand "Namastudios" as the Defendant. This article raises the formulation of the problem regarding the legal remedies available to the injured party in the case of an obligation in the decision Number 629/Pdt.G/2020/PN Jkt.Sel involving default in online buying and selling transactions and the implications of the decision Number 629/Pdt.G/2020/PN Jkt.Sel on consumer protection in online buying and selling transactions in Indonesia.