# Event Project > the technoligies :+1: > *react* :**frontend** > *nodejs (10.x)* :**backend** > *Exprees*: **backend routing in the front "/"** > ```mermaid= graph TD a(backend)-->b(nodejs(connect to monggoDB,logique,firstframe expreesJs)) ``` title slug =>unique dtaes ={ dates evente [one day, multiday] , date limite register date limite inscription ....... } chair : multi person / users =>notify to accept (with notification and mail) commities { type of commity : multi person / users =>notify to accept (with notification and mail) } photos() commetaire , status <!-- https://www.pexels.com/photo/photo-of-people-watching-a-concert-2747449/ -->