LWC Mistakes Every Dev Makes

Most Lightning Web Components ship with the same performance and security bugs — and the devs who wrote them have no idea. Get these wrong and your components end up slow, leaking data, and wide open to attack. In this breakdown, we walk through the 7 mistakes hiding in most LWCs — and how to fix every one of them, plus a pre-ship checklist you can run on every component. WHAT YOU'LL LEARN: ✅ Why fetching data in renderedCallback creates a fetch-render loop — and where to fetch instead ✅ How Lightning Data Service gives you caching and refresh for free vs hand-rolled Apex for basic CRUD ✅ How to stop hammering Apex on every keystroke with debouncing — and fix sloppy list rendering with stable keys ✅ Why Apex in LWC needs WITH SECURITY_ENFORCED or stripInaccessible — system mode won't protect you ✅ Why client-side-only validation and unsanitized innerHTML are security holes — and how to close them WHO THIS IS FOR: Salesforce developers, admins building LWC, and architects who want components that are fast, secure, and built to scale without drowning in technical debt. ABOUT THE SANDBOX: Real-world Salesforce platform best practices — architecture, Flow, Apex, security, data modeling, and Agentforce. No fluff, no theory-only tutorials. Just what works, what breaks, and why. #Salesforce #LWC #LightningWebComponents #SalesforceDeveloper #SalesforceSecurity Not affiliated with Salesforce. Some content is AI-assisted and reviewed by a working Salesforce developer