Salesforce LWC Interview Questions 2026 — Complete Guide (120 Questions) | SF Interview Pro
Complete LWC Series 2026 · Free

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
AllLevels Covered
100%Free
Start Part 1 All Topics
The Three Parts
1
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
2
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
3
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
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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 Live
M6–M8 Component Communication — Events, Pub-Sub & LMS, Navigation/Modals/Toasts Live
M9–M11 Data Integration — @wire Adapters, Imperative Apex, Caching & Refresh Live
M12–M15 Performance, Jest Testing, Security & Deployment, Capstone Project Live
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Complete Topic Index — All 120 Questions
Q#TopicLevelPart
Q1Why LWC over Aura? What is faster?BasicPart 1
Q2–Q3HTML File & JavaScript File in LWC BundleBasicPart 1
Q4–Q5Types of Decorators — @api, @track, @wire explainedIntermediatePart 1
Q6–Q9Wire — How many times, connectedCallback vs Wire, inside connectedCallbackIntermediatePart 1
Q8All 5 LWC Lifecycle Hooks with differencesIntermediatePart 1
Q10Lightning Message Service (LMS)AdvancedPart 1
Q12Toast Notifications — ShowToastEventBasicPart 1
Q14–Q15Parent → Child & Child → Parent CommunicationIntermediatePart 1
Q20cacheable=true — what it means, limitationsAdvancedPart 1
Q23–Q25Ways to call Apex — Wire vs Imperative deep diveIntermediatePart 1
Q28–Q30Lightning Data Service — getRecord, createRecord, updateRecordAdvancedPart 1
Q38refreshApex() — when and how to useIntermediatePart 1
Q39–Q40Pagination for 20,000 records + Chaining Apex callsAdvancedPart 1
Q41–Q42Slots (Default & Named) + Shadow DOMIntermediatePart 2
Q43–Q44lwc:if vs if:true + for:each vs iteratorIntermediatePart 2
Q45Dynamic Components — lwc:component + lwc:isAdvancedPart 2
Q46–Q47lightning-record-form Family + Custom ValidationBasicPart 2
Q48–Q49lightning-datatable + Inline Editing with ApexIntermediatePart 2
Q50Platform Events — EmpApi subscribe/unsubscribeAdvancedPart 2
Q53–Q54File Upload + Custom Modal in LWCAdvancedPart 2
Q57–Q58Performance Optimization + LWC Jest TestingAdvancedPart 2
Q62–Q63Apex Error Handling + DOM Access in LWCIntermediatePart 2
Q64Custom Lookup Component — full buildAdvancedPart 2
Q70–Q71Dependent Picklist + Picklist Values without ApexAdvancedPart 2
Q72Multi-Step Wizard / StepperAdvancedPart 2
Q75Server-side Pagination — SOQL LIMIT/OFFSETAdvancedPart 2
Q77–Q78All Communication Patterns + Reusable Search FilterAdvancedPart 2
Q80Senior LWC Developer Interview TopicsAdvancedPart 2
Q81Accessibility & ARIA in LWC — WCAG 2.1IntermediatePart 3
Q82Lightning Locker & Lightning Web SecurityAdvancedPart 3
Q83Change Data Capture (CDC) in LWCAdvancedPart 3
Q84–Q85Lightning Flow in LWC + External LibrariesIntermediatePart 3
Q86–Q90Real Builds — Star Rating, Kanban, Timeline, Data Grid, Progress TrackerAdvancedPart 3
Q91–Q92All Wire Adapters Reference + CurrentPageReferenceIntermediatePart 3
Q93–Q95Aura to LWC Migration + Common Bugs + Code Review ChecklistIntermediatePart 3
Q98–Q99Newest LWC Features 2025-26 + Agentforce ActionsAdvancedPart 3
Q100Complete Lifecycle Deep Dive — All PhasesAdvancedPart 3
Q113–Q114Race Conditions + Virtual Scroll for Large DataAdvancedPart 3
Q115–Q116Reactive Properties Deep Dive + Service Component PatternAdvancedPart 3
Q119–Q120LWC Anti-Patterns + Certification Mastery GuideAdvancedPart 3
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