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JWT (JSON Web Token)

JWT yaani JSON Web Token ek open standard (RFC 7519) hai jo do parties ke beech information ko…

Overview

JWT (JSON Web Token) — Quick Facts

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Property: Detail

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Full Name: JSON Web Token

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Abbreviation: JWT (pronounced "jot")

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Category: Web Security / Authentication /…

Topic 1

Infobox

🌐 | Property | Detail | |---|---| | Full Name | JSON Web Token | | Abbreviation | JWT…

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Kya Hai JWT

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Envelope ke upar likha hai ki yeh…

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Letter ke andar actual message hai…

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Seal/stamp bata raha hai ki yeh…

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Part 1: Header (algorithm + type)

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History aur Background

🖥️ | Year | Event | |---|---| | 2010-2011 | OAuth 2.0 development me token format ki…

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JWT Structure — Three Parts

📱 HEADER.PAYLOAD.SIGNATURE Har part Base64URL encoded hota hai (standard Base64 se…

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Header

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alg: Signing algorithm (e.g.,…

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typ: Token type (usually JWT)

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Optional: kid (Key ID — multiple…

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Payload (Claims)

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name, email, email_verified,…

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OIDC standard claims (given_name,…

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role, department, tenant_id,…

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Signature

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Same secret sign aur verify dono…

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Issuer aur verifier ke paas same…

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Private key se sign hota hai (sirf…

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Public key se verify hota hai (koi…

Topic 8

JWT Flow Diagram

🔒 `mermaid sequenceDiagram participant User participant Client as Client App…

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Registered Claims

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exp: Current time > exp → token…

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nbf: Current time < nbf → token…

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aud: Token ka audience meri…

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iss: Token ka issuer trusted nahi…

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JWS vs JWE — Signed vs Encrypted

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Token me sensitive PII hai…

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Token intermediary systems se…

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Regulatory requirement hai (HIPAA,…

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Usually: JWS ke andar JWE — sign…

Topic 11

Signing Algorithms

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Single service / monolith: HS256…

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Microservices / distributed: RS256…

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High performance + modern: ES256…

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OIDC / OAuth 2.0: RS256 most…

Topic 12

JWT vs Session-based Authentication

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Session-based: Traditional web…

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JWT-based: APIs, microservices,…

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JWT in OAuth 2.0 aur OIDC

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Self-contained: Resource server ko…

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Standard format: Claims structure…

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Interoperable: Multiple services…

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ID Token: Hamesha JWT format me…

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Access Token vs Refresh Token vs ID Token

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Agar access token leak ho jaye,…

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Refresh token se naya access token…

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User ko baar baar login nahi karna…

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Security aur UX dono balanced…

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Token Validation Process

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Authorization server apni public…

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URL example:…

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Resource servers yahan se public…

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Key rotation hone par JWKS…

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Security Best Practices

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alg: none KABHI allow mat karo —…

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Server-side algorithm enforce karo…

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Strong algorithms use karo: RS256,…

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Access tokens short-lived rakho…

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Common Vulnerabilities aur Attacks

🌐 1. alg: none Attack Attack: Attacker token ka alg header none me change kar deta hai →…

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JWT Token Lifecycle

💻 Lifecycle Stages | Stage | Description | |---|---| | 1. Issuance | Auth server user…

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JWT in Microservices Architecture

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Stateless verification: Har…

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User context propagation: JWT me…

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API Gateway pattern: Gateway JWT…

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Service-to-service auth: Internal…

Topic 20

JWT Libraries aur Implementations

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jwt.io: JWT debugger — token…

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jwt.ms: Microsoft JWT decoder

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JWT vs SAML vs SWT

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JWT: Modern applications, APIs,…

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SAML: Enterprise SSO, legacy…

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SWT: Generally deprecated — avoid…

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Real-World Use Cases

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User login karta hai → JWT milta…

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Server JWT verify karke request…

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Most common JWT use case

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User ek baar login karta hai (IdP…

Topic 23

Common Mistakes aur Anti-Patterns

⚡ 1. Sensitive Data in Payload Mistake: Passwords, credit card numbers, secrets JWT payload…

Topic 24

JWT Critics aur Limitations

🔒 1. Revocation Difficulty JWT self-contained hai — once issued, server "cancel" nahi kar…

Topic 25

Best Practices Summary

🌐 | Practice | Recommendation | |---|---| | Algorithm | RS256/ES256 for distributed; HS256…

Topic 26

Future Trends

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Standard profile for JWT-based…

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Consistent claim structures across…

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Interoperability improve hogi

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Sender-constrained tokens — token…

Comparison

JWS vs JWE — Signed vs Encrypted

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RFC: RFC 7515

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Purpose: Integrity + Authentication

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Data Visibility: Payload readable…

Comparison

JWT vs Session-based Authentication

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State: Stateful (session stored on…

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Storage: Server-side session store…

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Scalability: Harder (session…

Comparison

Access Token vs Refresh Token vs ID Token

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Purpose: API access authorize karna

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Format: JWT ya Opaque

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Lifetime: Short (5-60 minutes)

Comparison

JWT vs SAML vs SWT

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Format: JSON (compact)

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Size: Small (~300-2000 bytes)

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Encoding: Base64URL

Diagram

Visual Flow

📊 Diagram visualization — details in narration

Quiz — Question 1

JWT (JSON Web Token) ka sabse sahi definition kya hai?

Quick Quiz

Quiz — Question 2

JWT (JSON Web Token) ka 'Full Name' kya hai?

Complete! 🎉

JWT (JSON Web Token) Complete!

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JWT (JSON Web Token) Complete

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