This study aims to thoroughly investigate the changes in customer purchasing behavior across digital marketplaces amid the exceptional emergency caused by the COVID-19 pandemic, which has unparalleled influence on e-commerce. This research adopts a quantitative approach, leveraging survey questionnaires to collect data on customer purchasing behavior across digital marketplaces. Analysis of the collected data is conducted utilizing the Statistical Package for the Social Sciences (SPSS) software, enabling comprehensive statistical analysis to discern trends and patterns in customer behavior during the COVID-19 pandemic. It provides vital insights into the complex dynamics of customer behavior during times of crisis. The key findings emphasize the importance of comprehending customer preferences and behaviors in emergency scenarios for businesses in the e-commerce industry. The study demonstrates that, despite the obstacles presented by the pandemic, internet transactions not only remained viable but also acquired considerable significance for customers in Bangladesh. The Bangladeshi e-commerce sector demonstrated the crucial need for adaptability and resilience by effectively adapting to the changing market conditions caused by the pandemic. This study significantly contributes to understanding the Bangladeshi e-commerce landscape by addressing relevant research topics and objectives. It reveals a direct correlation between customer behavior and the success of e-commerce during pandemic-like events. It offers vital insights to organizations on how to modify their advertising, marketing, and promotional methods to effectively address customers' evolving requirements and priorities during times of crisis. In essence, this thorough examination acts as a vital manual for e-commerce enterprises in Bangladesh and other regions, helping them navigate the obstacles and possibilities presented by the COVID-19 era. It highlights the crucial significance of customer behavior in influencing the future of e-commerce, both in Bangladesh and worldwide.