⚡ Complete LWC Series 2026
Salesforce LWC Interview Questions — Complete Guide 2026
120 questions across 3 parts — from basic decorators to advanced architecture. Everything you need to crack any LWC interview in 2026.
120Questions
3Parts
🟢🟠🔴All Levels
100%Free
Part 1 · Q1–Q40
LWC Fundamentals & Core Concepts
LWC vs Aura, Decorators, Lifecycle Hooks, Wire, Events, LMS, LDS, Navigation & more
Why LWC over Aura?
@api, @track, @wire
All 5 Lifecycle Hooks
Wire vs Imperative Apex
Parent ↔ Child Communication
Lightning Message Service
Lightning Data Service (LDS)
NavigationMixin
Toast Notifications
refreshApex()
cacheable=true
Pagination (20K records)
40 Questions
Read Part 1 →
Part 2 · Q41–Q80
Advanced LWC — Slots, Datatable & Integration
Shadow DOM, Dynamic Components, Record Forms, Datatable, Platform Events, Jest & Performance
Slots — Default & Named
Shadow DOM Deep Dive
lwc:if vs if:true
Dynamic Components
lightning-datatable
Inline Editing + Apex Save
Platform Events (EmpApi)
Static Resources
Custom Modal
LWC Jest Testing
CSS Custom Properties
Performance Optimization
40 Questions
Read Part 2 →
Part 3 · Q81–Q120
Expert LWC — Architecture & Real Builds
Accessibility, CDC, Kanban, Virtual Scroll, Agentforce, Anti-Patterns & Senior Interview Topics
Accessibility & ARIA
Lightning Locker & LWS
Change Data Capture
Lightning Flow in LWC
Kanban with Drag & Drop
Star Rating Component
Virtual Scroll
Reactive Properties Deep Dive
Service Component Pattern
Optimistic UI Updates
Agentforce LWC Actions
LWC Anti-Patterns
40 Questions
Read Part 3 →
🎓 Beyond Interview Prep
Want to Actually Build LWCs — Not Just Answer Questions About Them?
120 questions test your knowledge. This free course builds the skill itself, from zero.
🆕 Free Complete Course 2026
LWC Zero to Hero
The most practical LWC course online — every concept paired with a real mini-implementation, a common-bugs "Gotcha" callout, and interview-style Q&As. From absolute programming basics through a production-grade capstone project.
16Modules (incl. Bonus)
3Live Now
90+Q&As (Planned)
100%Free Forever
M0
Bonus: Absolute Programming Basics (variables, loops, functions)
✅ Live
M1
Modern JavaScript Essentials for LWC (let/const, arrow fns, destructuring, spread/rest, classes, modules)
✅ Live
M2
Component Anatomy & Lifecycle Hooks (HTML/JS/meta.xml, full lifecycle sequence)
✅ Live
M3–M5
Templates & Directives, Data Binding & Reactivity, @api Properties
🔜 Soon
M6–M8
Component Communication — Events, Pub-Sub & LMS, Navigation/Modals/Toasts
🔜 Soon
M9–M11
Data Integration — @wire Adapters, Imperative Apex, Caching & Refresh
🔜 Soon
M12–M15
Performance, Jest Testing, Security & Deployment, Capstone Project
🔜 Soon
3 / 15 Modules Live 🔥
📋 Complete Topic Index — All 120 Questions
More Free Salesforce Interview Prep
1,400+ questions across 22 topics. 4 free courses. All free. No signup. No paywall. Ever.
Explore All Topics → Free Agentforce Course