@sushree.suravibuyan
We don’t have an activity pack dedicated to work with MongoDB, but you can create your own and plug it into UiPath. Here(https://docs.mongodb.org/ecosystem/drivers/csharp/) you can find a library that allows MongoDB interaction from a C# library.
You need to develop a custom C# assembly that implements activities for each action you want to perform, afterwards, pack both your assembly and the MongoDB driver dll into a NuGet activity pack and plug it into UiPath Studio following the instructions here.