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+---
+author: ["Saurav Dhakal"]
+title: "Understanding Separation of Concerns (SoC) in NestJS"
+date: "2025-08-19"
+summary: "A guide to understanding Separation of Concerns in NestJS using modules, services, and controllers."
+tags: ["nestjs", "typescript", "architecture"]
+categories: ["Backend Development", "NestJS"]
+series: ["NestJS"]
+ShowToc: true
+TocOpen: false
+---
+
+When building applications, one of the most important design principles to keep in mind is **Separation of Concerns (SoC)**. NestJS, with its modular architecture, makes applying SoC almost effortless — but understanding _why_ it matters and _how_ to use it properly will help you write cleaner, testable, and future-proof code.
+
+## What is Separation of Concerns and Why it Matters?
+
+The basic idea is:
+
+> A program should be divided into distinct sections, where each section addresses a single responsibility.