Wiki Article · Cinematic

Express.js Security

Express.js security ka matlab hai ke ek Express application ko web attacks, data leaks, aur…

Overview

Express.js Security — Quick Facts

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Property: Detail

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Full Name: Express.js Security

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Category: Web Security, Backend Engineering,…

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Framework: Express.js (Node.js)

Topic 1

Kyun Zaroori Hai

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Data breach — user passwords,…

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Financial loss — downtime, legal…

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Reputation damage — users ka trust…

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Legal liability — data protection…

Topic 2

Common Threats

🛡️ OWASP Top 10 se relevant Express.js threats: | # | Threat | Description | Express Impact…

Topic 3

Helmet.js — Security Headers

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Content-Security-Policy — XSS aur…

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X-Content-Type-Options: nosniff —…

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X-Frame-Options: DENY —…

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Strict-Transport-Security (HSTS) —…

Topic 4

Input Validation aur Sanitization

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Har input field ka type, length,…

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Libraries: express-validator, Joi,…

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Example checks: email format,…

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Input se dangerous characters…

Topic 5

Injection Prevention

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Cause: User input directly SQL…

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Prevention: Parameterized queries…

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ORMs (Sequelize, Knex, TypeORM) by…

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Cause: User input me $gt, $ne…

Topic 6

XSS Prevention

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Stored XSS — malicious script…

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Reflected XSS — script URL…

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DOM-based XSS — client-side…

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Output encoding/escaping — HTML…

Topic 7

CSRF Protection

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CSRF Token — har form me unique…

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SameSite Cookie — SameSite=Strict…

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Double Submit Pattern — cookie +…

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API-only apps — JWT/Bearer token…

Topic 8

Authentication aur Authorization

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JWT (JSON Web Token) — stateless…

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Session-based — server-side…

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OAuth 2.0 — third-party login…

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Passport.js — Express ke liye…

Topic 9

CORS Configuration

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Problem: By default browsers…

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Solution: Server CORS headers set…

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Best Practice: Wildcard (*)…

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Credentials: credentials: true tab…

Topic 10

Rate Limiting

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express-rate-limit — per-IP…

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Window strategies — fixed window,…

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Redis store — distributed rate…

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Different limits — login endpoint…

Topic 11

HTTPS aur TLS

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HTTP se data plaintext me jaata…

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HTTPS = HTTP + TLS encryption —…

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SSL/TLS certificate — Let's…

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Production me: Nginx/Load Balancer…

Topic 12

Security Checklist

⚠️ | Area | Action | Priority | |---|---|---| | Headers | Helmet.js install + use | Critical…

Topic 13

Security Architecture

🔐 `mermaid flowchart TD Client[Client Request] --> WAF[WAF / CDN - CloudFlare] WAF -->…

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Best Practices

👁️ 1. Helmet.js Day 1 se lagao — ek line aur sab critical headers set ho jaate hain 2. Never…

Diagram

Visual Flow

📊 Diagram visualization — details in narration

Quiz — Question 1

Express.js Security ka sabse sahi definition kya hai?

Quick Quiz

Quiz — Question 2

Express.js Security ka 'Full Name' kya hai?

Complete! 🎉

Express.js Security Complete!

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