MongoDB Atlas has rate limit of 100 requests per minute per project but if I host mongodb on my own server then will it have a rate limit or I can make unlimited read/write calls per minute to database. (obviously it is relative to the specifications of server) I am using Node js for making calls with mongoose
No, when you install MongoDB in your own premises, then you don't have any limit. Of course, the system has some MongoDB Limits and Thresholds but I don't think you will hit any of them.