#Rest Apis

REST API INTERVIEW QUESTIONS ⚡️ Most Frequent Questions asked in Interview (No Over-Prep) Comment "pdf" for interview precise answers to all these questions. BASICS 1️⃣What is a REST API? 2️⃣What are the core principles of REST architecture? 3️⃣What HTTP methods are used in REST APIs? 4️⃣What is the difference between GET and POST? 5️⃣What is the difference between PUT and PATCH? 6️⃣What is idempotency in REST APIs? 7️⃣What are common HTTP status codes used in REST? 8️⃣What is the difference between @RestController and @Controller in Spring Boot? 9️⃣What is @RequestBody and @PathVariable? 1️⃣0️⃣What is the role of @RequestMapping? IMPORTANT 1️⃣1️⃣ How does Spring Boot internally handle a REST request? (High-level flow) 1️⃣2️⃣ How do you implement global exception handling in Spring Boot? 1️⃣3️⃣ How do you implement pagination and sorting in a REST API? 1️⃣4️⃣ What is content negotiation in REST APIs? 1️⃣5️⃣How do you secure a REST API using Spring Security? 1️⃣6️⃣What is CORS and how do you configure it? 1️⃣7️⃣How do you validate incoming request payloads? 1️⃣8️⃣How do you version a REST API? 1️⃣9️⃣What is the difference between 401 and 403? 2️⃣0️⃣. How do you design a REST API for high scalability? SUPER IMPORTANT 2️⃣1️⃣How would you handle rate limiting in a distributed system? 2️⃣2️⃣How do you ensure idempotency for POST requests? 2️⃣3️⃣What are REST API design best practices? 2️⃣4️⃣How do you handle API backward compatibility? 2️⃣5️⃣How do you implement JWT authentication in Spring Boot? 2️⃣6️⃣What is an API Gateway and why is it needed? 2️⃣7️⃣How do you handle large file uploads in REST APIs? 2️⃣8️⃣How do you implement centralized logging and monitoring for REST services? 2️⃣9️⃣What are common mistakes developers make while designing REST APIs? Comment "pdf" for rest of the interview questions and precise answers to all these questions. #systemdesign #engineers #developers #softwareengineering #springboot [coding, system design, springboot, genAl developers, software engineer, coders, java]

Comment “API” to get the links! 🔥 Trying to build modern software without understanding APIs is like wiring systems together without agreeing on a language. If you don’t truly get what APIs are, how REST works, and why gateways exist, you’ll build fragile systems, misuse tools, and struggle with scaling and integration. This mini roadmap fixes that. ⚡ What Is an API? (Application Programming Interface) A clear explanation of what APIs actually are, why they exist, and how software systems communicate—without hand-wavy abstractions. 📚 What Is a REST API? A practical breakdown of REST principles, HTTP methods, statelessness, and resource-based design—so you stop guessing and start designing APIs correctly. 🎓 What Is an API Gateway? Learn why API Gateways exist, what problems they solve (auth, rate limiting, routing), and when you actually need one—versus when you don’t. 💡 With these API resources you will: 🚀 Stop treating APIs as “just controllers” 🧠 Build a correct mental model of client–server communication 🏗 Design cleaner, more scalable backend interfaces ⚙ Avoid common REST and API design mistakes ☁ Level up for Backend, Frontend, Microservices, and Cloud architectures If you want to move from “my endpoint works” to “my system scales, integrates, and evolves cleanly,” API fundamentals aren’t optional—they’re foundational. 📌 Save this post so you never lose this API roadmap. 💬 Comment “API” and I’ll send you all the links! 👉 Follow for more Backend Engineering, System Design, and Career Growth.

Different types of APIs explained simply but here’s the real question, can you actually use any of them? Most people can recognize terms like REST, SOAP, or third-party APIs, but get stuck when it comes to sending requests, handling responses, or using them in real projects. That gap between knowing and doing is exactly what we’re fixing in our API Masterclass. You won’t just learn the concepts, you’ll work with real APIs, real data, and real applications step by step. 📅 Starts: 29th April 🎟️ Limited slots remaining If you’re ready to stop just recognizing terms and start building with APIs, this is your next step. Book your slot now, link is on our bio. 🔁 @coding.kitty #APIs #APImasterclass #TechSkills #SoftwareDevelopment #CodingJourney

Follow @cloud_x_berry for more info #APIResponseTime #SystemDesign #BackendPerformance #WebArchitecture #NetworkingProtocols API performance comparison, gRPC protocol, GraphQL API, REST API, WebSocket protocol, binary protocol, single endpoint API, HTTP caching, persistent connections, full HTTP request, latency optimization, network overhead, API throughput, real time communication, client server architecture, performance benchmarking, scalable APIs, backend optimization, protocol efficiency, user experience speed

Most developers use REST APIs every single day. Very few actually understand what they are. REST is not just about writing GET and POST endpoints. It’s an architectural style based on: • Resources • Representations • Stateless communication • Standard HTTP methods • Uniform interface When you call: GET /users You’re requesting a representation of a resource’s current state. When you send: POST /orders You’re transferring a new state to the server. REST APIs are stateless — which means every request is independent. No server-side memory of previous calls. That’s why modern systems scale. And here’s the truth most people miss: REST is format-agnostic. It can return JSON, XML, HTML, YAML, even binary formats. JSON is popular. It’s not mandatory. If you truly understand REST APIs, you understand how frontend talks to backend, how microservices communicate, and how scalable systems are designed. Master this once. It will show up in every interview, every backend role, every system design discussion. #restapi #backenddevelopment #systemdesign #softwareengineering #microservices webdevelopment techcontent developers

A REST API (Representational State Transfer Application Programming Interface) enables interaction between computer systems on the web using the principles of REST, a lightweight architecture style for web services. Key Concepts of REST APIs Resources • Resource: Anything that can be named, such as a document, image, or service. • URI (Uniform Resource Identifier): The unique address for each resource. ○ Example: /books, /books/{id} HTTP Methods • GET: Retrieve a resource. ○ Example: GET /books (Retrieves all books) • POST: Create a new resource. ○ Example: POST /books (Adds a new book) • PUT: Update an existing resource. ○ Example: PUT /books/{id} (Updates the book with specified ID) • DELETE: Delete a resource. ○ Example: DELETE /books/{id} (Deletes the book with specified ID) Stateless • Each request from client to server must contain all the information needed to understand and process the request. • The server does not store any session information. Client-Server Architecture • Clients (users or other services) request resources. • Servers provide resources or services. • Separation allows clients and servers to evolve independently. HTTP Status Codes • 200 OK: The request was successful. • 201 Created: The resource was successfully created. • 204 No Content: The request was successful but no content to return. • 400 Bad Request: The request could not be understood or was missing required parameters. • 401 Unauthorized: Authentication failed or user does not have permissions. • 404 Not Found: Resource was not found. • 500 Internal Server Error: An error occurred on the server. . . . #coding #software #softwaredeveloper #job #faang #google #amazon #development #developer #career #programming #leetcode #codingquestions #googleinterview #microsoftinterview #softwareengineer #amazonjobs #softwaredevelopment #problemsolving #leetcodequestion #interview #dsaquestions #discipline #restapi #api #codingquestions #dsa #datastructures #algorithm #itsruntym

Day 13/365 Challenge ⬇️ Everyone says they know REST APIs. But interviews don’t test if you can “build an endpoint” — they test if you understand the fundamentals. Here are the REST API concepts you MUST know: 1️⃣ What is REST & why it is stateless 2️⃣ HTTP Methods (GET, POST, PUT, PATCH, DELETE) — when to use what 3️⃣ Idempotency (Why PUT is idempotent but POST isn’t) 4️⃣ Status Codes (200 vs 201 vs 204 vs 400 vs 401 vs 403 vs 404 vs 500) 5️⃣ Request vs Response structure 6️⃣ Path Params vs Query Params 7️⃣ Headers (Authorization, Content-Type, Accept) 8️⃣ Authentication vs Authorization 9️⃣ Rate Limiting 🔟 Versioning (/v1/ vs header versioning) 1️⃣1️⃣ Pagination, Filtering, Sorting 1️⃣2️⃣ Caching (ETag, Cache-Control) Why this matters 👇 Because companies don’t just want coders. They want engineers who understand scalability, reliability, and proper API design. If you don’t know: • Why REST is stateless • Why 201 is returned after POST • Or why PUT must replace the entire resource You’re not interview ready yet. Master fundamentals. That’s what separates 6 LPA from 25 LPA developers. 🚀 Save this. Revise this. Practice explaining each concept clearly. 👉 Save this for your backend interview prep 👉 Share this with your developer friend 👉 Follow for daily system design & backend content 🚀 👉 Want 60 Most Asked System Design Questions? Just Follow + Comment yes #techreels #systemdesign #backenddeveloper #softwaredevelopment #cloudcomputing

RESTful APIs Explained

Everyone says they know REST APIs. But interviews don’t test if you can “build an endpoint” — they test if you understand the fundamentals. Here are the REST API concepts you MUST know: 1️⃣ What is REST & why it is stateless 2️⃣ HTTP Methods (GET, POST, PUT, PATCH, DELETE) — when to use what 3️⃣ Idempotency (Why PUT is idempotent but POST isn’t) 4️⃣ Status Codes (200 vs 201 vs 204 vs 400 vs 401 vs 403 vs 404 vs 500) 5️⃣ Request vs Response structure 6️⃣ Path Params vs Query Params 7️⃣ Headers (Authorization, Content-Type, Accept) 8️⃣ Authentication vs Authorization 9️⃣ Rate Limiting 🔟 Versioning (/v1/ vs header versioning) 1️⃣1️⃣ Pagination, Filtering, Sorting 1️⃣2️⃣ Caching (ETag, Cache-Control) Why this matters 👇 Because companies don’t just want coders. They want engineers who understand scalability, reliability, and proper API design. If you don’t know: • Why REST is stateless • Why 201 is returned after POST • Or why PUT must replace the entire resource You’re not interview ready yet. Master fundamentals. That’s what separates 6 LPA from 25 LPA developers. 🚀 Save this. Revise this. Practice explaining each concept clearly. 👉 Save this for your backend interview prep 👉 Share this with your developer friend 👉 Follow for daily system design & backend content 🚀 👉 Want 60 Most Asked System Design Questions? Link in bio 🔥 #techreels #systemdesign #backenddeveloper #softwaredevelopment #cloudcomputing

REST API vs FastAPI… confusion ends here 👇 REST = the rules 📖 FastAPI = the tool 🔧 One defines how APIs should work The other helps you build them fast ⚡ Now it finally makes sense, right? 🚀 #restapi #fastapi #reels #viralreels #nikhil2k5

Backend concepts you should know 👇🏻 Comment "link" to get this document in Dm Core Concepts 1. What is an API 2. REST vs GraphQL 3. HTTP methods (GET, POST, PUT etc) 4. HTTP status codes (2xx, 4xx, 5xx) 5. Stateless vs Stateful APIs 6. Authentication vs Authorization 7. Session-based auth vs JWT 8. OAuth 2.0 (Login with Google, GitHub, etc.) 9. Rate limiting vs Throttling 10. Idempotency (especially for payments) ⸻ Databases & Data Handling 11. SQL vs NoSQL — when to use what 12. Indexes and how they speed up queries 13. ACID properties 14. Transactions & isolation levels 15. Database normalization vs denormalization 16. Pagination (offset vs cursor-based) 17. Sharding & partitioning 18. Read replicas & write scaling 19. Handling duplicate records 20. Optimistic vs pessimistic locking ⸻ Caching & Performance 21. What is caching and where to cache 22. Cache eviction strategies (TTL, LRU) 23. Cache consistency & stale cache problems 24. CDN and edge caching 25. Why cache can make systems wrong ⸻ Distributed Systems & Scaling 26. Load balancing (round-robin, least connections, hashing) 27. Horizontal vs vertical scaling 28. Microservices vs monoliths (trade-offs) 29. Service-to-service communication (sync vs async) 30. Message queues (Kafka, RabbitMQ, SQS) ⸻ Reliability & Real-World Problems 31. Exactly-once vs at-least-once processing 32. Retries, timeouts, and circuit breakers 33. Handling race conditions 34. Distributed locking 35. Event-driven architecture 36. Saga pattern (distributed transactions) 37. Graceful degradation 38. Observability (logs, metrics, tracing) 39. Deployments (blue-green, rolling) 40. Handling traffic spikes & viral load #BackendEngineering #SystemDesign #softwareengineering #softwareengineer #techcareers (backend interview preparation, system design concepts, API basics, backend engineering roadmap, software engineering interviews)

🚀 From zero to microservices hero — one step at a time. Mastering microservices isn’t about jumping into complex systems… it’s about building strong foundations and stacking skills strategically. Here’s the path 👇 1️⃣ Learn REST, APIs & system design basics 2️⃣ Build with Java + Spring Boot 3️⃣ Understand databases & state management 4️⃣ Dive into Kafka & event-driven systems 5️⃣ Containerize with Docker & Kubernetes 6️⃣ Ship like a pro with CI/CD & observability Consistency > speed. Keep building. Keep scaling. 📈 💬 Which step are you currently on? #Microservices #JavaDeveloper #SpringBoot #BackendDevelopment #SoftwareEngineer CodingJourney SystemDesign Docker Kubernetes Kafka DevOps LearnToCode TechCareer ProgrammingLife