How can i use Appwrite with my own MongoDB database?

In my web application, i want to store the auth data after logging in from google and facebook into my own mongodb database

You can’t directly connect your own MongoDB with Appwrite.

But You can use functions to communicate and store the data into your MongoDB.

could you provide some examples?

You can learn about functions here https://appwrite.io/docs/products/functions

Do you have REST API to communicate with your MongoDB?