Ensure Unique Index on Email

MongoDB

Technical Specification

Create a unique index on the email field of users collection so duplicate emails are not allowed.

Input/Output Samples

Input:insert user with existing email

Output:Duplicate key error

Optimal Logic Path

db.users.createIndex(
  { email: 1 },
  { unique: true }
);

Architectural Deep-Dive

Unique indexes enforce data constraints at database level, preventing duplicate user emails.