Lightning Web Components website screenshot

Lightning Web Components

Lightning Web Components (LWC) is Salesforce's MIT-licensed, open-source JavaScript UI framework, built directly on native web standards — custom elements, shadow DOM and ES modules — rather than on a proprietary component abstraction. It compiles components to native custom elements, renders in the browser and on the server, and is the component model for the Salesforce Platform as well as a standalone framework for any web app. LWC is distributed exclusively through npm: there is no hosted API, no API key, no pricing and no rate limit. Its contract surface is a JavaScript API — LightningElement, the @api, @track and @wire decorators, lifecycle hooks and wire adapters — accompanied by a published 109-code compiler diagnostic registry, a semver versioning and breaking-change policy, and a lightning-* base component library of 91 consumer-facing components.

Lightning Web Components publishes 1 API on the APIs.io network. Tagged areas include Frontend, JavaScript, Lightning Web Components, Salesforce, and Web Components.

Lightning Web Components’ developer surface includes documentation, getting-started guide, code examples, changelog, CLI, sandbox, API reference, and 26 more developer resources.

🌐 Visit website 📡 Source on GitHub
41.8/100 developing ▬ flat Agent 10/100 agent aware Full breakdown ↓
scored 2026-09-14 · rubric v0.22.0
AccessFreemium
1 APIs 1 MCP Servers
FrontendJavaScriptLightning Web ComponentsSalesforceWeb ComponentsCustom ElementsShadow DOMOpen-SourceUI FrameworkComponent Library

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-09-14 · rubric v0.22.0
Composite quality — 41.8/100 · developing
Contract Quality 1.4 / 21
Developer Ergonomics 11.3 / 17
Access Clarity 7.6 / 17
Operational Transparency 4.1 / 11
Contract Governance 1.9 / 10
Discoverability 5.7 / 9
Regulatory Posture 8.3 / 15
Agent readiness — 10/100 · agent aware
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 10
Documented Reversibility 0 / 6
MCP Server 12 / 12
Machine-Readable Auth 0 / 10
Idempotency 0 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 7 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 0 / 4
Delegated User Identity 0 / 6
Protected Resource Metadata 0 / 5
Registration Without a Human 0 / 6
Agentic Commerce Well-Known Document 0 / 5
Regulatory Posture applies to this provider. Its tags matched the Education & Research regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.
Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.
The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/lightning-web-components: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 1

Individual APIs this provider publishes, each with its own machine-readable definition.

Lightning Web Components Runtime API

Core JavaScript APIs for building Lightning Web Components including decorators, wire service, and component lifecycle methods.

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Salesforce DX MCP Server — LWC toolsets

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Lightning Web Components Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Lightning Web Components Rate Limits

0 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Lightning Web Components Finops

FINOPS

Security Posture 3

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Lightning Web Components Domain Security

TLSv1.3 · DNSSEC · DMARC

SECURITY

Lightning Web Components Vulnerability Disclosure

Hackerone

SECURITY

Lightning Web Components Trust Center

PCI DSS, IRAP

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

GettingStarted
GettingStarted
 Sandbox
Sandbox
 DeveloperPortal
DeveloperPortal

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

MCPServer
MCPServer
 LLMsTxt
LLMsTxt

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conformance
Conformance
 ErrorCatalog
ErrorCatalog
 Lifecycle
Lifecycle
 Conventions
Conventions
 Components
Components

Build 6

SDKs, sample code, and the tooling you integrate with

Examples
Examples
 Packages
Packages
 SDKs
SDKs
 CLI
CLI
 GitHubOrganization
GitHubOrganization
 SourceCode
SourceCode

Access & Security 5

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 VulnerabilityDisclosure
VulnerabilityDisclosure
 Security
Security
 TrustCenter
TrustCenter
 Compliance
Compliance

Operate 4

Status, limits, changes, and where to get help

Deprecation
Deprecation
 ChangeLog
ChangeLog
 RateLimits
RateLimits
 Support
Support

Commercial 4

Pricing, plans, and the legal terms of use

Plans
Plans
 License
License
 TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: lightning-web-components
name: Lightning Web Components
description: 'Lightning Web Components (LWC) is Salesforce''s MIT-licensed, open-source JavaScript UI framework, built directly
  on native web standards — custom elements, shadow DOM and ES modules — rather than on a proprietary component abstraction.
  It compiles components to native custom elements, renders in the browser and on the server, and is the component model for
  the Salesforce Platform as well as a standalone framework for any web app. LWC is distributed exclusively through npm: there
  is no hosted API, no API key, no pricing and no rate limit. Its contract surface is a JavaScript API — LightningElement,
  the @api, @track and @wire decorators, lifecycle hooks and wire adapters — accompanied by a published 109-code compiler
  diagnostic registry, a semver versioning and breaking-change policy, and a lightning-* base component library of 91 consumer-facing
  components.'
type: Index
deliveryModel:
  model: unknown
  open_source: unknown
  commercial: true
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - pricing
  - repository-unlicensed
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/lightning-web-components.png
tags:
- Frontend
- JavaScript
- Lightning Web Components
- Salesforce
- Web Components
- Custom Elements
- Shadow DOM
- Open-Source
- UI Framework
- Component Library
tags_raw:
- Frontend
- JavaScript
- Lightning Web Components
- Salesforce
- Web Components
- Custom Elements
- Shadow DOM
- Open Source
- UI Framework
- Component Library
url: https://raw.githubusercontent.com/api-evangelist/lightning-web-components/refs/heads/main/apis.yml
created: '2024-01-15'
modified: '2026-08-27'
specificationVersion: '0.23'
apis:
- aid: lightning-web-components:lightning-web-components
  name: Lightning Web Components Runtime API
  description: Core JavaScript APIs for building Lightning Web Components including decorators, wire service, and component
    lifecycle methods.
  humanURL: https://developer.salesforce.com/docs/component-library/documentation/en/lwc
  tags:
  - Frontend
  - JavaScript
  - Salesforce
  - Web Components
  properties:
  - type: Documentation
    url: https://developer.salesforce.com/docs/component-library/documentation/en/lwc
common:
- type: Website
  url: https://lwc.dev/
- type: DomainSecurity
  url: security/lightning-web-components-domain-security.yml
- url: https://developer.salesforce.com/docs/component-library/overview/components
  type: Documentation
- url: https://developer.salesforce.com/docs/component-library/documentation/en/lwc/lwc.get_started_introduction
  type: GettingStarted
- url: https://github.com/trailheadapps/lwc-recipes
  type: Examples
- type: Packages
  url: packages/lightning-web-components-packages.yml
- type: SDKs
  url: packages/lightning-web-components-packages.yml
- type: MCPServer
  url: mcp/lightning-web-components-mcp.yml
- type: LLMsTxt
  url: llms/lightning-web-components-llms.txt
- type: Conformance
  url: conformance/lightning-web-components-conformance.yml
- type: ErrorCatalog
  url: errors/lightning-web-components-error-codes.yml
- type: Lifecycle
  url: lifecycle/lightning-web-components-lifecycle.yml
- type: Deprecation
  url: lifecycle/lightning-web-components-lifecycle.yml
- type: ChangeLog
  url: changelog/lightning-web-components-changelog.yml
- type: Conventions
  url: conventions/lightning-web-components-conventions.yml
- type: CLI
  url: cli/lightning-web-components-cli.yml
- type: Components
  url: components/lightning-web-components-components.yml
- type: Sandbox
  url: sandbox/lightning-web-components-sandbox.yml
- type: VulnerabilityDisclosure
  url: security/lightning-web-components-vulnerability-disclosure.yml
- type: Security
  url: security/lightning-web-components-vulnerability-disclosure.yml
- type: TrustCenter
  url: security/lightning-web-components-trust-center.yml
- type: Compliance
  url: security/lightning-web-components-trust-center.yml
- type: Plans
  url: plans/lightning-web-components-plans-pricing.yml
- type: RateLimits
  url: rate-limits/lightning-web-components-rate-limits.yml
- type: DeveloperPortal
  url: https://lwc.dev/
- type: APIReference
  url: https://lwc.dev/guide/reference
- type: Support
  url: https://lwc.dev/community
- type: Blog
  url: https://developer.salesforce.com/blogs/
- type: GitHubOrganization
  url: https://github.com/salesforce
- type: SourceCode
  url: https://github.com/salesforce/lwc
- type: License
  url: https://github.com/salesforce/lwc/blob/master/LICENSE.md
- type: TermsOfService
  url: https://www.salesforce.com/company/legal/sfdc-website-terms-of-service/
- type: PrivacyPolicy
  url: https://www.salesforce.com/company/privacy/
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-enrichment:
  date: '2026-08-27'
  status: enriched
  artifacts_added: 14
  pass: local-v1
x-parent: salesforce
x-relationship: product

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