MongoDB document model

A single collection can represent shortened URLs (e.g., ShortUrl).

MongoDB Schema

Field	Type	Description
id	String	Unique ID
originalUrl	String	Original URL
shortCode	String	Unique shortcode
createdAt	DateTime	Creation
expiresAt	DateTime	Expiration dat

Fields

id
- Primary identifier (MongoDB _id / ObjectId or a mapped string).
originalUrl
- The long URL provided by the client.
shortCode
- Unique code used in the redirect path.
createdAt
- When the mapping was created.
expiresAt
- When the mapping becomes invalid (10 days after creation).

Users Collection

This collection store registered users for authentication and ownership tracking

Field	Type	Description
userID	String	Unique User ID
username	String	User Name
password	String	User Password

Fields

userID
- Primary identifier (MongoDB _userID a mapped string).
username
- The username provided by the client.
password
- Unique password provided by the client.

Key design points

Unique `shortCode`