Computer Science Engineering Notes

Learn Functions in Javascript ✨

How Mobile Internet Works (4G / 5G)

From SIM card to mobile tower to internet server – learn how mobile data works.
Simple explanation for students and beginners.

Margin vs Padding in CSS ✨

Pattern In C programming 💡🙂
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API Routing in NextJS 🔥🔥

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Complete API Development Roadmap 2024: The Ultimate Guide

Breaking down everything you need to build professional-grade APIs:

1. Top Types of APIs:
• REST - Traditional web services
• GraphQL - Flexible data fetching
• gRPC - High-performance services
• WebSocket - Real-time communication
• OpenAPI (Swagger) - API specification

2. Top API Methods:
• GET - Retrieve
• POST - Create
• PUT - Update
• DELETE - Remove
• PATCH - Partial update
• HEAD - Metadata
• OPTIONS - Communication options

3. Top Security Stack:
• SSL/TLS Encryption
• Rate Limiting
• Access Control
• IP Whitelisting
• CSRF Protection
• Input Validation

4. Authentication:
• JWT (JSON Web Tokens)
• OAuth 2.0
• OpenID Connect
• API Keys
• Bearer Tokens
• HMAC Authentication

5. API Testing Suite:
• Unit Testing
• Integration Testing
• Performance Testing
• Security Testing
• Contract Testing
• Load Testing
• Mocking/Stubbing

6. Documentation Essentials:
• OpenAPI (Swagger)
• RAML
• AsyncAPI
• API Blueprint
• Postman Collections
• ReadMe .io
• Stoplight

7. Design Principles:
• Statelessness
• Caching
• Versioning
• Pagination
• Error Handling
• Idempotency
• Resource-Based URI

8. Versioning Strategies:
• URI Versioning
• Header Versioning
• Query Parameter Versioning
• Content Negotiation
• Semantic Versioning
• Backward Compatibility
• Deprecation Strategy

9. Tools & Frameworks:
• Postman
• Swagger
• AWS API Gateway
• Express.js
• Apigee
• Insomnia
• RAML Modeling

Pro Tips:
1. Choose versioning strategy early
2. Automate documentation updates
3. Implement comprehensive testing
4. Design with scalability in mind
5. Monitor performance metrics

Design Patterns in React for learning

Helmet Js JavaScript library/ Node Js library

Software engineer/ Software Developer/ Web developer 🚿🌿
try out https://www.cloudyzx.com

🚀 Understanding the Django Request-Response Cycle 🚀

Have you ever wondered what happens behind the scenes when you hit a URL in your browser on a Django-based web app? 🧐
Let’s dive into the Django request-response cycle!

Client Browser 🌐 It all starts when the user enters a URL or interacts with your web app. The browser sends an HTTP request to your Web Server (like Nginx or Apache).

Web Server 🖥️ The web server receives the request and forwards it to WSGI (Web Server Gateway Interface), which acts as a bridge between the server and your Django app.

WSGI 🛠️ WSGI forwards the request to Django, which processes it through a series of Middlewares.

Request (Middleware) 🔄 Middleware functions are processed first, handling things like authentication, session management, and more. Once the middlewares finish processing, Django moves on to URL resolution.

URL Resolution 🔗 Django matches the request URL to a pattern in your urls.py. If a match is found, it directs the request to the appropriate View.

View 👁️ In the view, the request is handled, and any necessary logic is executed. If the view needs data from the database, it will communicate with the Models.

Models and Managers 🗄️ Models are the interface to your database. Django Managers are used to retrieve objects (data) from the database, process it, and send it back to the view.

Database 💾 The database stores and retrieves the necessary data that the view requested.

Templates 🎨 Once the data is retrieved, it is passed into a Template to generate the HTML response, which is sent back to the browser.

Exceptions ⚠️ Throughout the cycle, Django handles any Exceptions that might occur, returning appropriate error responses (like a 404 for URL not found or 500 for server errors).

Finally, the Response is generated and sent back to the Client Browser, completing the cycle. 🔄
This entire process happens in a fraction of a second, ensuring that users experience a seamless interaction with your web application. ⚡

Best System design resources for Coding Interviews
1. ZTM - https://bit.ly/3YpWu4q
2. ByteByteGo - https://bit.ly/3P3eqMN
1. Grokking the System Design - https://bit.ly/3ckZlsl
3. Pragmatic Design - https://bit.ly/3vFNPid
4. Software Design - https://bit.ly/3BxMXzr
5. Software Architecture 101 - https://bit.ly/3pzJCJh
6. Modern design - https://bit.ly/3OQKX8B
7. DesignGuru - https://bit.ly/3pMiO8g
8. Meetapro - https://bit.ly/48UAXpJ

Must know for every JavaScript Developer 🔥

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Technology used:
PHP CodeIgniter And Laravel, DB MYSQL.
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