Practical security guides for developers.
Focused, source-backed guidance for controls that commonly fail in web products and SaaS applications.
How to secure a web application
Build security around trust boundaries: authenticate users safely, authorize every sensitive action and object, constrain untrusted input, protect browser flows, and verify the controls with negative tests before release.
Next.js security checklist for production
Treat every Server Action and Route Handler as a public endpoint, authorize close to the data, keep secrets server-only, set session cookies on the server, and deploy a CSP that matches the rendering mode you actually use.
How to secure a Node.js API
Secure the request lifecycle end to end: bound and parse input, authenticate the caller, authorize the action and object, use safe data APIs, constrain outbound requests, and expose only deliberate errors and logs.
Manual security review vs SAST: when to use each
Use SAST continuously for repeatable code patterns and policy enforcement; use manual review where security depends on business context, identity, data flow across components or whether a candidate is actually exploitable. Mature teams combine both.
How to fix broken access control
Deny by default, express the actor-action-resource policy on the server, scope every object lookup to the current owner or tenant, and prove enforcement with negative tests that swap identities, roles and identifiers.
SaaS security checklist before launch
Before launch, prove tenant isolation and privileged workflows, harden identity and recovery, verify billing and webhooks, remove production secrets from code, and rehearse detection, backup and incident-response paths.
Need the controls checked in your repository?
A code review traces the actual authorization and data flows.