Database Design

Description

All collection name, fields name follows naming format: All lower-case, separate words using _.

User

{
    "_id": {
        "<USER_ID: automatically generated by MongoDb>",
        "username": "<USER NAME: length 4-20 string with only a-z, A-Z, 0-9, ~!@#$%^&*-=>", 
        "password": "",
        "email": "<USER EMAIL>",
        "phone_number": "<USER PHONE>"
    }
}