Nestjs full course 3 headers access and validation

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okay, let's dive into a comprehensive guide on nestjs, covering full cors configuration (handling headers and access), validation techniques, and providing detailed code examples. this will be a long and thorough explanation, so buckle up!

**table of contents**

1. **introduction to nestjs**
2. **project setup and core concepts**
3. **cors configuration in nestjs**
* understanding cors
* global cors configuration
* route-specific cors configuration
* advanced cors options: custom origin function
4. **request validation in nestjs**
* why validation is crucial
* using `class-validator` and `class-transformer`
* validation pipes: global, controller-level, and route-specific
* creating custom validation decorators
5. **detailed code examples**
* cors implementation
* validation implementation
* full example: user registration
6. **error handling and custom exceptions**
7. **best practices and security considerations**
8. **conclusion**

**1. introduction to nestjs**

nestjs is a progressive node.js framework for building efficient, reliable, and scalable server-side applications. it leverages typescript and combines elements of oop (object-oriented programming), fp (functional programming), and frp (functional reactive programming). this architecture promotes modularity, testability, and maintainability.

**key features:**

* **typescript:** strong typing improves code quality and developer productivity.
* **modular architecture:** applications are built from reusable modules.
* **dependency injection:** manages dependencies between components, promoting loose coupling.
* **decorators:** simplify configuration and metadata declaration.
* **built-in support for common patterns:** mvc, cqrs, and more.
* **testing:** designed with testability in mind.

**2. project setup and core concepts**

before we start with cors and validation, let's create a basic nestjs project.
**explanat ...

#NestJS #FullCourse #coding
NestJS
full course
headers access
validation
API development
middleware
decorators
request validation
response handling
security best practices
TypeScript
server-side development
RESTful services
authentication
authorization

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