Security Blog

Insights, guides, and best practices for JavaScript security

Node.jsRace ConditionsBusiness LogicTOCTOUTransactionsIdempotencyPostgreSQLAPI SecurityOWASP

Race Conditions and Business Logic Flaws in Node.js: Atomic Endpoints and TOCTOU Defenses [2026]

Your auth can be bulletproof while attackers drain your balance two requests at a time. Business logic flaws and race conditions are how 'correct' code loses money and data. Here's how check-then-act bugs actually happen in Node.js, and the atomic fixes — conditional updates, row-locked transactions, unique constraints, and idempotency keys — that close them.

Read more →
Node.jsNext.jsSQL InjectionNoSQL InjectionPrismaMongoDBDatabase SecurityOWASP

SQL and NoSQL Injection Prevention in Node.js: ORM Safety and Parameterized Queries [2026]

Injection is still the #1 web application risk — and ORMs are not bulletproof. Here's how SQL injection and NoSQL injection actually happen in Node.js, which ORM APIs are safe, and a defense-in-depth strategy for Prisma, Knex, Sequelize, and MongoDB.

Read more →
Node.jsNext.jsSecrets ManagementEnvironment VariablesDevSecOpsCI/CDDockerAPI Keys

Secrets Management for Node.js and Next.js: Protect Your API Keys in 2026

Leaked API keys, committed .env files, and secrets baked into Docker images are how most startups get breached. Here's a production-grade secrets management strategy for Node.js and Next.js: env validation, git history hygiene, vaults, CI/CD masking, and rotation.

Read more →
JavaScriptNode.jsPrototype PollutionObject SecurityOWASP Top 10Backend SecurityInput Validation

Prototype Pollution in JavaScript and Node.js: Prevention Guide for 2026

Prototype pollution is one of the most misunderstood yet dangerous vulnerabilities in JavaScript applications. Here's how it works, how attackers exploit it in Node.js and React/Next.js apps, and the concrete patterns — safe merge, Object.create(null), schema validation, and defensive coding — you need to prevent it.

Read more →
Node.jsNext.jsFile UploadAPI SecurityOWASP Top 10Web SecurityBackend Security

Secure File Upload in Node.js and Next.js: Defenses, Code Examples, and Audit Checklist [2026]

File upload is one of the most exploited attack surfaces in modern web apps. Learn how to secure file uploads in Node.js and Next.js — with production-grade code for validation, sanitization, malware scanning, and a complete audit checklist for your next security review.

Read more →
GraphQLNode.jsNext.jsAPI SecurityApolloRate LimitingAuthorizationOWASP Top 10

GraphQL Security for Node.js and Next.js: Attacks, Defenses, and Production Checklists

GraphQL gives clients enormous power — and that power can be weaponized. Learn how to secure your Node.js GraphQL API against introspection leaks, query bombing, batching attacks, resolver-level authZ bypasses, and injection via variables — with production-ready code and testing tools.

Read more →
Node.jsNext.jsSSRFAPI SecurityServer ComponentsOWASP Top 10Backend SecurityNetwork Security

SSRF Prevention in Node.js and Next.js: Server-Side Request Forgery Defense Guide [2026]

Server-Side Request Forgery (SSRF) is one of the most dangerous vulnerabilities for modern full-stack applications. Here's how to prevent SSRF in Node.js backends, Next.js Server Components, API routes, and server actions — with practical code examples and a production-ready validation library.

Read more →
Node.jsOWASPExpressBackend SecuritySQL InjectionSecurity ChecklistAPI Security

OWASP Top 10 for Node.js Backends: A Practical Security Guide for 2026

The OWASP Top 10 mapped to Node.js and Express backends — with real code examples for each vulnerability, exploitation patterns, and concrete mitigations every Node.js team should have in their audit checklist.

Read more →
Node.jsNext.jsRate LimitingAPI SecurityDDoSBrute ForceRedis

API Rate Limiting and Brute Force Protection in Node.js and Next.js [2026]

Rate limiting is your first line of defense against brute force attacks, DDoS, and API abuse. Here's how to implement production-grade rate limiting in Node.js and Next.js using Express middleware, Next.js middleware, and Redis-backed sliding windows.

Read more →
ReactNext.jsCSPContent Security PolicyXSSWeb Security

Content Security Policy in React and Next.js: A Practical Guide to CSP with Nonces and strict-dynamic [2026]

Implementing a production-grade Content Security Policy for React and Next.js applications. Covers nonce-based CSP, strict-dynamic, reporting, eval management, and real-world deployment patterns for 2026.

Read more →
ReactNext.jsAuthenticationJWTSession ManagementCSRF

Auth & Session Management in React and Next.js: A Security-First Guide for 2026

JWT storage, CSRF protection, session hijacking prevention, and secure authentication patterns for React and Next.js applications. A practical guide for startups building production auth systems.

Read more →
ReactXSSSecurityCSPFrontend

XSS in React: What Every Developer Needs to Know in 2026

React's JSX protects against XSS by default, but dangerouslySetInnerHTML, SSR hydration, URL injection, and third-party scripts still leave applications vulnerable. Here's a complete guide to preventing XSS in React applications.

Read more →
Next.jsReactSecuritySSRFull-Stack

Next.js Security Best Practices: A Complete Guide for 2026

Next.js combines server and client rendering, creating unique attack surfaces. Learn how to secure your App Router app with CSP nonces, middleware guardrails, safe data fetching, and a full checklist.

Read more →
Node.jsnpmSecuritySupply ChainDependencies

npm Audit is Not Enough: Node.js Dependency Security in 2026

npm audit is a good start, but it won't protect your Node.js app from real-world supply chain attacks. Here's a complete dependency security strategy with Snyk, Semgrep, and OWASP Dependency-Check.

Read more →
ReactSecurityAuditOWASP

React Security Audit: A Complete Guide for Developers

Learn how to conduct a comprehensive React security audit. Covers XSS prevention, CSP headers, dependency security, OWASP Top 10, and more. Includes a practical checklist.

Read more →