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 is listed with 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 31 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

38.3/100 thin ▬ flat Agent 10/100 agent aware Front door AI 1/6 silent saas Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessPaidOpen

1 API 1 MCP Servers

Frontend JavaScriptLightning Web ComponentsSalesforce Web ComponentsCustom ElementsShadow DOMOpen Source UI FrameworkComponent Library

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 38.3/100 · thin

Contract Quality 1.4 / 21

Developer Ergonomics 11.3 / 17

Access Clarity 7.2 / 17

Operational Transparency 3.9 / 11

Contract Governance 1.9 / 10

Discoverability 5.4 / 9

Regulatory Posture 4.4 / 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

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

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/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document Ask about this →
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author Ask about this →
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey) Ask about this →
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented) Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →

9 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 6.5 — up to +23.4 composite points Ask about this →
Access Clarity scores 42.6 — up to +11.5 composite points Ask about this →
Contract Governance scores 18.2 — up to +9.8 composite points Ask about this →

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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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 the provider profile at artifacts.apis.io/lightning-web-components/apis.yml: open an issue on github.com/api-evangelist/lightning-web-components to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

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 requiring OAuth; 13 tools listed.

MCP SERVER

Lightning Web Components API pricing

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

Terms of Service 1

What its API terms permit and prohibit, quoted from its own page.

Lightning Web Components

6 quoted statements, read from Lightning Web Components's own page on 2026-11-09.

TERMS

Privacy & Data 1

Its role, the data it processes, retention and transfers, quoted from its own privacy page.

Lightning Web Components

26 quoted statements, read from Lightning Web Components's own page on 2026-11-09.

PRIVACY

Eligibility 1

Who may sign up and where, quoted from its own terms.

Lightning Web Components

2 quoted statements, read from Lightning Web Components's own page on 2026-11-09.

ELIGIBILITY

Data License 1

How its data and outputs may be reused, quoted from its own terms.

Lightning Web Components

2 quoted statements, read from Lightning Web Components's own page on 2026-11-09.

LICENSE

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

ErrorCatalog

Lifecycle

Conventions

Components

Build 6

SDKs, sample code, and the tooling you integrate with

Examples

Packages

SDKs

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

ChangeLog

RateLimits

Support

Commercial 7

Pricing, plans, and the legal terms of use

FinOps

Plans

License

TermsOfService

PrivacyPolicy

UsageTerms

DataLicense

Scroll for all 7

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

DataProcessing

DataProcessing

Eligibility

Eligibility

Source (apis.yml)

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: saas
  license_evidence:
    not_product:
    - salesforce/lwc
  open_source: unknown
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: low
  source:
  - pricing
  - repository-not-product
  generated: '2026-09-25'
  method: derived
accessModel:
  pricing: paid
  onboarding: open
  trial: false
  try_now: false
  public: true
  gated: none
  gated_source:
  - onboarding
  label: Paid · Open access
  confidence: medium
  source:
  - finops
  - rate-limits
  - security
  - sandbox
  generated: '2026-11-13'
  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
- Open-Source
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: FinOps
  url: finops/lightning-web-components-finops.yml
- 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/
- type: UsageTerms
  url: terms/lightning-web-components-terms-of-service.yml
- type: DataProcessing
  url: privacy/lightning-web-components-privacy-policy.yml
- type: Eligibility
  url: eligibility/lightning-web-components-eligibility.yml
- type: DataLicense
  url: data-license/lightning-web-components-data-license.yml
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

Lightning Web Components API — frequently asked questions

Does Lightning Web Components have an API?

Yes. APIs.io lists 1 API from Lightning Web Components, including Lightning Web Components Runtime API.

Does Lightning Web Components have an MCP server?

Yes. APIs.io lists 1 MCP server for Lightning Web Components: MCP server requiring OAuth; 13 tools listed.

Is the Lightning Web Components API ready for AI agents?

Lightning Web Components has a Kin Score of 38.3 out of 100 (thin) and an Agent Readiness score of 10.1 (agent-aware), scored by API Evangelist on 2026-11-13.

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