Humanitarian research with Syrian refugees can be difficult to conduct in-person, due to COVID-19 containment, security, and logistics issues. We assessed whether the online implementation of a brief, culturally grounded resilience measure would yield reliable responses for use with children and adolescents in the Middle East region. We implemented an online survey screening for socio-economic status, insecurity, prosocial behaviour, and resilience (using the Child Youth Resilience Measure, CYRM) with 119 Syrian refugees (14-18 years old; 74 male, 45 female) living in Jordan. Responses were compared with in-person data, available for a separate cohort of 324 Syrian refugees, previously sampled in Jordan with the same survey instruments. The online CYRM produced reliable and valid responses, as shown by analyses of internal reliability, convergent and divergent validity, and 7-day test-retest consistency. We reflect on logistic, ethical, and methodological challenges of online surveys, and suggest ways to plan and execute online research with hard-to-reach, crisis-affected communities.