Side-by-Side Parity Audit

Verify the modernization by performing a side-by-side architectural and interaction audit between the legacy and modern applications.

Objective

Ensure 1:1 functional parity by systematically comparing the live behavior and internal logic of both applications. The goal is to prove the new code is a perfect functional replacement.

Prerequisites

1. Legacy App: Running on http://localhost:3000.
2. Modern App: Running on http://localhost:3001.
3. Unified State (MongoDB): Both applications must target the same database instance to ensure data consistency during side-by-side testing.

Pre-Audit Environment Setup

Before performing the audit, you MUST ensure a stable MongoDB environment: