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backend/nestjs.md

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+# NestJS
+
+## Summary
+
+- [Introduction](#introduction)
+- [CLI Commands](#cli-commands)
+  - [Installation](#installation)
+  - [Usages](#usages)
+
+## Introduction
+
+**NestJS** is a framework for building efficient, scalable Node.js server-side applications. It uses progressive **JavaScript**, supports **TypeScript** and combines the element of **OOP** (Object Oriented Programming), **FP** (Functional Programming) & **FRP** (Functional Reactive Programming).
+
+[Back to Summary](#summary)
+
+## CLI Commands
+
+### Installation
+
+```code
+$ npm i -g @nestjs/cli
+```
+
+### Usages
+
+**1) nest new**
+
+```code
+$ npm new <project_name> [options]
+```
+
+**Options**
+
+| Option                  | Description                                                                       |
+| :---------------------- | :-------------------------------------------------------------------------------- |
+| _--dry-run_             | Report the changes made, but it doesn't affect the file system. <br/> Alias: _-d_ |
+| _--language [language]_ | Specify programming language (TS or JS).<br/> Alias: _-l_                         |
+
+**2) nest generate**
+
+```code
+$ nest generate <schematic> <name> [options]
+$ nest g <schematic> <name> [options]
+```
+
+where,<br/>
+_&lt;schematic&gt;_ - to generate. <br/>
+_&lt;name&gt;_ - name of the generated component. <br/>
+
+**Schematics**<br/>
+| Name | Description |
+| :---- | :---- |
+|app| Generates a new application within a monorepo|
+|library| Generates a new library within a monorepo|
+|class|Generate a new class|
+|controller|Generate a new controller|
+|decorator|Generate decorator |
+|filter|Generate a filter|
+|gateway|Generate a gateway|
+|guard|Generate a guard|
+|interface|Generate an interface|
+|interceptor|Generate an interceptor|
+|middleware|Generate a middleware|
+|module|Generate a module|
+|pipe|Generate a pipe|
+|provider|Generate a provider|
+|resolver|Generate a resolver|
+|service| Generate a service|
+|resource| Generates a new CRUD resource |
+
+**CRUD generator**
+
+| Commands      | Description                                         |
+| :------------ | :-------------------------------------------------- |
+| **nest g mo** | Generates a module for groping related components   |
+| **nest g co** | Generates a controller to define CRUD routes        |
+| **nest g s**  | Generates a service to implement the business logic |
+
+[Back to Summary](#summary)