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Online food community purchases contributed to urban residents' food security during the COVID-19 pandemic in Shanghai. The influence of the outbreak on the purchasing behavior of an online food community was examined. An innovative e-commerce model describes how the online community purchases facilitate integration of local food and agri-product resources, and provide consumers, especially residents of densely populated agglomerations, with convenient short-distance distribution. The survey data collected from 1168 residents show that the lockdown severity and food security concerns increased the frequency of residents' online food purchases. Heterogeneity analysis indicated that the Omicron outbreak effected the online food purchases of those born before the 1990s, males, the less educated, and low-income earners through a community group effect. The internet provides a convenient means of disseminating information, promoting access to local foods, and assuring food access during public health emergencies. Purchasing food online can be further enhanced through standardized management of online communities. [ABSTRACT FROM AUTHOR]