JavaScriptCore

E24803

JavaScript engine software library

JavaScriptCore is Apple’s high-performance JavaScript engine used primarily in the Safari web browser and WebKit-based applications.

Predicate	Object
instanceOf	JavaScript engine → software library →
category	runtime system → web browser engine component →
developer	Apple Inc. →
exposesAPI	C API → JavaScriptCore.framework → Objective-C API →
frameworkName	JavaScriptCore.framework →
implementsFeature	DOM-related JavaScript execution (via WebKit integration) → ECMAScript runtime semantics →
integratedInto	Safari Web Inspector tooling →
license	BSD-like license →
openSourceProject	WebKit →
optimizedFor	high performance →
partOf	WebKit project →
platform	iOS → iPadOS → macOS → tvOS → watchOS →
programmingLanguage	C++ →
providesFeature	Garbage collection → JavaScript bytecode interpreter → JavaScript parser → JavaScript runtime → Just-in-time compilation →
relatedTo	Nitro (Safari JavaScript engine name) →
replaces	older WebKit JavaScript interpreters →
repository	https://webkit.org →
supportsFeature	ES6 features (progressively) → generators → promises → strict mode → typed arrays →
supportsLanguage	JavaScript →
supportsOptimization	JIT compilation → code specialization → inline caching →
supportsStandard	ECMAScript →
targetArchitecture	ARM → Apple silicon → x86_64 →
usedFor	embedding JavaScript in applications → executing JavaScript in Safari → running web content in WebKit-based apps →
usedIn	Safari → WebKit →

Subject (surface form when different)	Predicate
ChakraCore → JavaScriptCore ("Nitro (Safari JavaScript engine name)") →	relatedTo
Apple Safari ("Nitro JavaScript engine") → Safari →	usesEngine
WebKit ("KJS") →	basedOn
WebKit →	component
JavaScriptCore ("JavaScriptCore.framework") →	exposesAPI
JavaScriptCore ("JavaScriptCore.framework") →	frameworkName
WebKit ("JavaScriptCore JIT compiler") →	notableComponent
JavaScript →	notableImplementation
Bun →	usesJavaScriptEngine