#Jwt

How Jwt Token works ? #education #codewithyuki #coding #jwt #authentication

Most real systems use both JWT and Sessions. JWT for scalable customer-facing apps. Sessions for tightly controlled internal systems. Same company. Different needs. Different architecture. #backenddevelopment #systemdesign #jwt #authentication #softwareengineering

JWT is NOT encryption. It doesn’t hide your data — it just protects it from being changed. Anyone can read a JWT. No secret. No hack. Just decode it. What JWT actually guarantees: ✔ The data wasn’t tampered ✔ The token was issued by the server What JWT does NOT guarantee: ❌ Data secrecy ❌ Hidden user details Think of JWT like a transparent ID card with a seal: You can read it. You can’t modify it. That’s why: 👉 Never store passwords, secrets, or sensitive data in JWT 👉 HTTPS encrypts data in transit, not the token itself Readable ≠ Encrypted. Untampered ≠ Hidden. Save this. Most freshers (and many devs) get this wrong. #jwt #authentication #authorization #websecurity #backendengineering softwareengineering developers cybersecurity tokens api techeducation

Comment “blog” & I’ll share the blog link & my notes with you in your DM 🤝🏻 (Make sure to follow else automation won’t work) Topic: JSON Web token (JWT) Save for your future interviews 📩 #dsa #systemdesign #tech #coding #codinglife #jwt [dsa, system design, jwt, tech, json web token]

JWT doesn’t break security. Bad implementation does. #JWT #WebSecurity #CyberSecurity #EthicalHacking #HackToRoot

System Design Interview: JWT 🔥 What is JSON Web Token and how is it used in authentication? We cover the structure of a JWT, how verification works, and the main pros and cons engineers should know before using it in production systems. A quick breakdown for backend engineers preparing for system design interviews. Follow @alex_pro_ai for more 💻 #jwt #softwareengineer #systemdesign #development #ai

ASMR - Tutorial Autenticación JWT con Python 🚀 Aprende las bases para proteger tu APIs con tokens JWT #python #jwt #javascript #webdevelopment #backenddev

Interviewer : JWT never stored on server. Then how does server verify it? 🤔 Most devs say “server checks database.” Wrong. JWT needs zero DB lookup. That’s the whole point. Here’s how 👇 Think of it like a signed cheque 🏦 Bank doesn’t remember every cheque issued. But checks the signature when presented. Signature valid? Genuine. No record needed. JWT works exactly like this. Step 1️⃣ — JWT Structure JWT = 3 parts → xxxxx.yyyyy.zzzzz → Header → algorithm used → Payload → user_id, role, expiry → Signature → the magic ✨ Step 2️⃣ — How Signature Created → Server takes Header + Payload → Runs HMAC with SECRET_KEY → Produces unique Signature → SECRET_KEY never leaves server 🔐 Step 3️⃣ — How Server Verifies You send JWT → server 👇 → Re-runs HMAC on header + payload → Compares with signature in token → Match → Valid ✅ → No match → Rejected ❌ Zero DB call. Instant. ⚡ Nobody fakes this without SECRET_KEY. Step 4️⃣ — The Logout Problem JWT can’t be invalidated before expiry ⚠️ Fix used in production 👇 → Short expiry 15 mins + Refresh Token → Blacklist only logged out tokens in Redis Real World 👇 → Swiggy → JWT for user sessions → Zerodha → JWT for trading sessions → Every REST API → should use JWT ✅ Simple way to remember 🧠 👉 JWT = signed cheque 👉 Server re-signs and compares 👉 SECRET_KEY = never share it 👉 Short expiry + refresh token = production standard Follow @abhi_techhub ❤️ for daily interview prep . . . #JWT #Authentication #SystemDesign #BackendDev #TechInterview SoftwareEngineering CodingInterview Security NodeJS abhi_techhub

Authentication vs Authorization 🔐 This looks simple, but interviewers use it to see how you think about systems — not just UI screens. AUTHENTICATION 👤 Answers: Who are you? Verifies the identity of a user, service, or system. Common methods: Username & password 🔑 OTP / Biometrics 📱👆 API keys 🧩 OAuth / JWT 🎫 👉 Login is just one type. ❌ If authentication fails, request stops immediately. AUTHORIZATION 🛂 Answers: What can you do? Checks if authenticated identity can access a resource. Evaluates: Roles 👥 Permissions 📝 Scopes 🎯 Policies 📜 Contextual rules (time/device/location) ⏰📍💻 👉 Happens after authentication. ✅ Only permitted actions are executed. REAL-LIFE EXAMPLE ✈️ Authentication = Showing your ID at the airport. Authorization = Access to cockpit vs passenger area. Same identity, different permissions. INTERVIEW ONE-LINER 🎯 Authentication → verifies who you are. Authorization → decides what you can do. Follow @codedsoul_05 ❤️ #backend #java #springboot #jwt #security techinterviews systemdesign softwareengineer

Comment “session” to get the links for difference 🚀 Ever wondered how your app remembers you after login? Session and JWT both solve this… but in completely different ways ⚡ Session → server remembers you JWT → you carry your identity Understand this difference → you unlock real backend system design 🔥 #backend #jwt #interviewprep #systemdesign #coding Keywords: jwt vs session, authentication vs authorization, stateful vs stateless, backend system design, token based authentication, session based auth, cookies vs bearer token, redis session store, microservices auth, api security, login system design, scalable backend, refresh token flow, access token jwt, security best practices, coding interview prep, faang backend prep, developer mindset, distributed systems basics, Chandan Agrawal Microsoft

Link do lab: https://portswigger.net/web-security/jwt/lab-jwt-authentication-bypass-via-unverified-signature JWT é um token usado para autenticação em aplicações web. Ele é dividido em três partes: header, payload e assinatura. O header diz qual algoritmo foi usado. O payload carrega os dados do usuário, como nome e permissões. A assinatura garante que ninguém adulterou o token. O problema acontece quando o servidor não valida essa assinatura. Nesse caso, qualquer pessoa pode editar o payload, trocar o próprio usuário por um admin, e o servidor aceita sem questionar. #web #jwt #bypass #tecnologia #cibersegurança

Access Token vs Refresh Token — explained simply 🚀 Most auth bugs happen because devs confuse these two. If you’re building secure APIs, JWT auth, or scalable backend systems, this is a must-know concept. Save this reel 💾 — it’ll help you in interviews & real projects. #backenddevelopment #devops #systemdesign #jwt #authentication websecurity api nodejs fullstackdeveloper softwareengineering programmingreels techeducation developersofinstagram codinglife learnbackend