Is there a way to retrieve the names/values of all global variables on a page?
I would like to write a javascript function to do the following:
How do I do this?
Or you could simply run;
Object.keys(window);
It will show a few extra globals (~5), but far fewer than the for (var i in window) answer.
Object.keys is available in Chrome 5+, Firefox 4+, IE 9+, and Opera 12, ty @rink.attendant.6
Object.keys is available in Chrome 5+, Firefox 4+, IE 9+, and Opera 12+.
Something like this:
function getGlobalProperties(prefix) {
var keyValues = [], global = window; // window for browser environments
for (var prop in global) {
if (prop.indexOf(prefix) == 0) // check the prefix
keyValues.push(prop + "=" + global[prop]);
}
return keyValues.join('&'); // build the string
}
A test usage:
var xxx_foo = "foo";
xxx_bar = "bar";
window.xxx_baz = "baz";
var test = getGlobalProperties('xxx_');
// test contains "xxx_baz=baz&xxx_bar=bar&xxx_foo=foo"
getGlobalProperties("Input"))? That's a global variable, right?In some cases you may want to find non-enumerable properties; therefore for..in won't work (spec, about chrome) and neither would Object.keys as both only use enumerable keys. Notice that for..in is different to in but we can't use this to iterate.
Here is a solution using Object.getOwnPropertyNames (compatibility is IE9+). I've also added support for when you do only want enumerable properties or if you want to search another in context (not global).
function findPrefixed(prefix, context, enumerableOnly) {
var i = prefix.length;
context = context || window;
if (enumerableOnly) return Object.keys(context).filter( function (e) {return e.slice(0,i) === prefix;} );
else return Object.getOwnPropertyNames(context).filter( function (e) {return e.slice(0,i) === prefix;} );
}
findPrefixed('webkit');
// ["webkitAudioContext", "webkitRTCPeerConnection", "webkitMediaStream", etc..
Then if you want to join e.g.
findPrefixed('webkit').map(function (e) {return e+'='+window[e];}).join('&');
// "webkitAudioContext=function AudioContext() { [native code] }&webkitRTCPeerConnection=function RTCPeerConnection() etc..
You could do something like this:
for (var i in window) {
// i is the variable name
// window[i] is the value of the variable
}
Though with this, you'll get a bunch of extra DOM properties attached to window.
Object.keys(window); shows far fewer extra DOM properties.
In my case, the two top answers didn't work, thus I am adding another answer, to highlight the comment of Dan Dascalescu:
Object.keys(window);
When I executed it, it gave:
top,location,document,window,external,chrome,$,jQuery,matchMedia,jQuery1113010234049730934203,match_exists,player_exists,add_me,isLetter,create_match,delete_me,waiting,unsure,refresh,delete_match,jsfunction,check,set_global,autoheight,updateTextbox,update_match,update_player,alertify,swal,sweetAlert,save_match,$body,value_or_null,player,position,ability,obj_need_save,xxx_saves,previousActiveElement
where the player, positon, ability, obj_need_save, xx_saves are my actual global variables.
I just saw that there exists a similar answer to another question.
In case you want to exclude the variables that are present by default in the global window object, such as Object, Function and Array, and those added by the browser, such as dir, dirxml and profile, you can run the following script:
const defaultKeys = ["Object","Function","Array","Number","parseFloat","parseInt","Infinity","NaN","undefined","Boolean","String","Symbol","Date","Promise","RegExp","Error","AggregateError","EvalError","RangeError","ReferenceError","SyntaxError","TypeError","URIError","globalThis","JSON","Math","Intl","ArrayBuffer","Atomics","Uint8Array","Int8Array","Uint16Array","Int16Array","Uint32Array","Int32Array","BigUint64Array","BigInt64Array","Uint8ClampedArray","Float32Array","Float64Array","DataView","Map","BigInt","Set","WeakMap","WeakSet","Proxy","Reflect","FinalizationRegistry","WeakRef","decodeURI","decodeURIComponent","encodeURI","encodeURIComponent","escape","unescape","eval","isFinite","isNaN","console","Option","Image","Audio","webkitURL","webkitRTCPeerConnection","webkitMediaStream","WebKitMutationObserver","WebKitCSSMatrix","XSLTProcessor","XPathResult","XPathExpression","XPathEvaluator","XMLSerializer","XMLHttpRequestUpload","XMLHttpRequestEventTarget","XMLHttpRequest","XMLDocument","WritableStreamDefaultWriter","WritableStreamDefaultController","WritableStream","Worker","WindowControlsOverlayGeometryChangeEvent","WindowControlsOverlay","Window","WheelEvent","WebSocket","WebGLVertexArrayObject","WebGLUniformLocation","WebGLTransformFeedback","WebGLTexture","WebGLSync","WebGLShaderPrecisionFormat","WebGLShader","WebGLSampler","WebGLRenderingContext","WebGLRenderbuffer","WebGLQuery","WebGLProgram","WebGLObject","WebGLFramebuffer","WebGLContextEvent","WebGLBuffer","WebGLActiveInfo","WebGL2RenderingContext","WaveShaperNode","VisualViewport","VisibilityStateEntry","VirtualKeyboardGeometryChangeEvent","ViewTransitionTypeSet","ViewTransition","ViewTimeline","VideoPlaybackQuality","VideoFrame","VideoColorSpace","ValidityState","VTTCue","UserActivation","URLSearchParams","URLPattern","URL","UIEvent","TrustedTypePolicyFactory","TrustedTypePolicy","TrustedScriptURL","TrustedScript","TrustedHTML","TreeWalker","TransitionEvent","TransformStreamDefaultController","TransformStream","TrackEvent","TouchList","TouchEvent","Touch","ToggleEvent","TimeRanges","TextUpdateEvent","TextTrackList","TextTrackCueList","TextTrackCue","TextTrack","TextMetrics","TextFormatUpdateEvent","TextFormat","TextEvent","TextEncoderStream","TextEncoder","TextDecoderStream","TextDecoder","Text","TaskSignal","TaskPriorityChangeEvent","TaskController","TaskAttributionTiming","SyncManager","SubmitEvent","StyleSheetList","StyleSheet","StylePropertyMapReadOnly","StylePropertyMap","StorageEvent","Storage","StereoPannerNode","StaticRange","SourceBufferList","SourceBuffer","ShadowRoot","Selection","SecurityPolicyViolationEvent","ScrollTimeline","ScriptProcessorNode","ScreenOrientation","Screen","Scheduling","Scheduler","SVGViewElement","SVGUseElement","SVGUnitTypes","SVGTransformList","SVGTransform","SVGTitleElement","SVGTextPositioningElement","SVGTextPathElement","SVGTextElement","SVGTextContentElement","SVGTSpanElement","SVGSymbolElement","SVGSwitchElement","SVGStyleElement","SVGStringList","SVGStopElement","SVGSetElement","SVGScriptElement","SVGSVGElement","SVGRectElement","SVGRect","SVGRadialGradientElement","SVGPreserveAspectRatio","SVGPolylineElement","SVGPolygonElement","SVGPointList","SVGPoint","SVGPatternElement","SVGPathElement","SVGNumberList","SVGNumber","SVGMetadataElement","SVGMatrix","SVGMaskElement","SVGMarkerElement","SVGMPathElement","SVGLinearGradientElement","SVGLineElement","SVGLengthList","SVGLength","SVGImageElement","SVGGraphicsElement","SVGGradientElement","SVGGeometryElement","SVGGElement","SVGForeignObjectElement","SVGFilterElement","SVGFETurbulenceElement","SVGFETileElement","SVGFESpotLightElement","SVGFESpecularLightingElement","SVGFEPointLightElement","SVGFEOffsetElement","SVGFEMorphologyElement","SVGFEMergeNodeElement","SVGFEMergeElement","SVGFEImageElement","SVGFEGaussianBlurElement","SVGFEFuncRElement","SVGFEFuncGElement","SVGFEFuncBElement","SVGFEFuncAElement","SVGFEFloodElement","SVGFEDropShadowElement","SVGFEDistantLightElement","SVGFEDisplacementMapElement","SVGFEDiffuseLightingElement","SVGFEConvolveMatrixElement","SVGFECompositeElement","SVGFEComponentTransferElement","SVGFEColorMatrixElement","SVGFEBlendElement","SVGEllipseElement","SVGElement","SVGDescElement","SVGDefsElement","SVGComponentTransferFunctionElement","SVGClipPathElement","SVGCircleElement","SVGAnimationElement","SVGAnimatedTransformList","SVGAnimatedString","SVGAnimatedRect","SVGAnimatedPreserveAspectRatio","SVGAnimatedNumberList","SVGAnimatedNumber","SVGAnimatedLengthList","SVGAnimatedLength","SVGAnimatedInteger","SVGAnimatedEnumeration","SVGAnimatedBoolean","SVGAnimatedAngle","SVGAnimateTransformElement","SVGAnimateMotionElement","SVGAnimateElement","SVGAngle","SVGAElement","Response","ResizeObserverSize","ResizeObserverEntry","ResizeObserver","Request","ReportingObserver","ReportBody","ReadableStreamDefaultReader","ReadableStreamDefaultController","ReadableStreamBYOBRequest","ReadableStreamBYOBReader","ReadableStream","ReadableByteStreamController","Range","RadioNodeList","RTCTrackEvent","RTCStatsReport","RTCSessionDescription","RTCSctpTransport","RTCRtpTransceiver","RTCRtpSender","RTCRtpReceiver","RTCPeerConnectionIceEvent","RTCPeerConnectionIceErrorEvent","RTCPeerConnection","RTCIceTransport","RTCIceCandidate","RTCErrorEvent","RTCError","RTCEncodedVideoFrame","RTCEncodedAudioFrame","RTCDtlsTransport","RTCDataChannelEvent","RTCDTMFToneChangeEvent","RTCDTMFSender","RTCCertificate","PromiseRejectionEvent","ProgressEvent","Profiler","ProcessingInstruction","PopStateEvent","PointerEvent","PluginArray","Plugin","PictureInPictureWindow","PictureInPictureEvent","PeriodicWave","PerformanceTiming","PerformanceServerTiming","PerformanceScriptTiming","PerformanceResourceTiming","PerformancePaintTiming","PerformanceObserverEntryList","PerformanceObserver","PerformanceNavigationTiming","PerformanceNavigation","PerformanceMeasure","PerformanceMark","PerformanceLongTaskTiming","PerformanceLongAnimationFrameTiming","PerformanceEventTiming","PerformanceEntry","PerformanceElementTiming","Performance","Path2D","PannerNode","PageTransitionEvent","OverconstrainedError","OscillatorNode","OffscreenCanvasRenderingContext2D","OffscreenCanvas","OfflineAudioContext","OfflineAudioCompletionEvent","NodeList","NodeIterator","NodeFilter","Node","NetworkInformation","NavigatorUAData","Navigator","NavigationTransition","NavigationHistoryEntry","NavigationDestination","NavigationCurrentEntryChangeEvent","Navigation","NavigateEvent","NamedNodeMap","MutationRecord","MutationObserver","MouseEvent","MimeTypeArray","MimeType","MessagePort","MessageEvent","MessageChannel","MediaStreamTrackVideoStats","MediaStreamTrackProcessor","MediaStreamTrackGenerator","MediaStreamTrackEvent","MediaStreamTrackAudioStats","MediaStreamTrack","MediaStreamEvent","MediaStreamAudioSourceNode","MediaStreamAudioDestinationNode","MediaStream","MediaSourceHandle","MediaSource","MediaRecorder","MediaQueryListEvent","MediaQueryList","MediaList","MediaError","MediaEncryptedEvent","MediaElementAudioSourceNode","MediaCapabilities","MathMLElement","Location","LayoutShiftAttribution","LayoutShift","LargestContentfulPaint","KeyframeEffect","KeyboardEvent","IntersectionObserverEntry","IntersectionObserver","InputEvent","InputDeviceInfo","InputDeviceCapabilities","Ink","ImageData","ImageCapture","ImageBitmapRenderingContext","ImageBitmap","IdleDeadline","IIRFilterNode","IDBVersionChangeEvent","IDBTransaction","IDBRequest","IDBOpenDBRequest","IDBObjectStore","IDBKeyRange","IDBIndex","IDBFactory","IDBDatabase","IDBCursorWithValue","IDBCursor","History","HighlightRegistry","Highlight","Headers","HashChangeEvent","HTMLVideoElement","HTMLUnknownElement","HTMLUListElement","HTMLTrackElement","HTMLTitleElement","HTMLTimeElement","HTMLTextAreaElement","HTMLTemplateElement","HTMLTableSectionElement","HTMLTableRowElement","HTMLTableElement","HTMLTableColElement","HTMLTableCellElement","HTMLTableCaptionElement","HTMLStyleElement","HTMLSpanElement","HTMLSourceElement","HTMLSlotElement","HTMLSelectElement","HTMLScriptElement","HTMLQuoteElement","HTMLProgressElement","HTMLPreElement","HTMLPictureElement","HTMLParamElement","HTMLParagraphElement","HTMLOutputElement","HTMLOptionsCollection","HTMLOptionElement","HTMLOptGroupElement","HTMLObjectElement","HTMLOListElement","HTMLModElement","HTMLMeterElement","HTMLMetaElement","HTMLMenuElement","HTMLMediaElement","HTMLMarqueeElement","HTMLMapElement","HTMLLinkElement","HTMLLegendElement","HTMLLabelElement","HTMLLIElement","HTMLInputElement","HTMLImageElement","HTMLIFrameElement","HTMLHtmlElement","HTMLHeadingElement","HTMLHeadElement","HTMLHRElement","HTMLFrameSetElement","HTMLFrameElement","HTMLFormElement","HTMLFormControlsCollection","HTMLFontElement","HTMLFieldSetElement","HTMLEmbedElement","HTMLElement","HTMLDocument","HTMLDivElement","HTMLDirectoryElement","HTMLDialogElement","HTMLDetailsElement","HTMLDataListElement","HTMLDataElement","HTMLDListElement","HTMLCollection","HTMLCanvasElement","HTMLButtonElement","HTMLBodyElement","HTMLBaseElement","HTMLBRElement","HTMLAudioElement","HTMLAreaElement","HTMLAnchorElement","HTMLAllCollection","GeolocationPositionError","GeolocationPosition","GeolocationCoordinates","Geolocation","GamepadHapticActuator","GamepadEvent","GamepadButton","Gamepad","GainNode","FormDataEvent","FormData","FontFaceSetLoadEvent","FontFace","FocusEvent","FileReader","FileList","File","FeaturePolicy","External","EventTarget","EventSource","EventCounts","Event","ErrorEvent","EncodedVideoChunk","EncodedAudioChunk","ElementInternals","Element","EditContext","DynamicsCompressorNode","DragEvent","DocumentType","DocumentTimeline","DocumentFragment","Document","DelegatedInkTrailPresenter","DelayNode","DecompressionStream","DataTransferItemList","DataTransferItem","DataTransfer","DOMTokenList","DOMStringMap","DOMStringList","DOMRectReadOnly","DOMRectList","DOMRect","DOMQuad","DOMPointReadOnly","DOMPoint","DOMParser","DOMMatrixReadOnly","DOMMatrix","DOMImplementation","DOMException","DOMError","CustomStateSet","CustomEvent","CustomElementRegistry","Crypto","CountQueuingStrategy","ConvolverNode","ContentVisibilityAutoStateChangeEvent","ConstantSourceNode","CompressionStream","CompositionEvent","Comment","CloseWatcher","CloseEvent","ClipboardEvent","CharacterData","CharacterBoundsUpdateEvent","ChannelSplitterNode","ChannelMergerNode","CanvasRenderingContext2D","CanvasPattern","CanvasGradient","CanvasCaptureMediaStreamTrack","CSSVariableReferenceValue","CSSUnparsedValue","CSSUnitValue","CSSTranslate","CSSTransition","CSSTransformValue","CSSTransformComponent","CSSSupportsRule","CSSStyleValue","CSSStyleSheet","CSSStyleRule","CSSStyleDeclaration","CSSStartingStyleRule","CSSSkewY","CSSSkewX","CSSSkew","CSSScopeRule","CSSScale","CSSRuleList","CSSRule","CSSRotate","CSSPropertyRule","CSSPositionValue","CSSPositionTryRule","CSSPositionTryDescriptors","CSSPerspective","CSSPageRule","CSSNumericValue","CSSNumericArray","CSSNestedDeclarations","CSSNamespaceRule","CSSMediaRule","CSSMatrixComponent","CSSMathValue","CSSMathSum","CSSMathProduct","CSSMathNegate","CSSMathMin","CSSMathMax","CSSMathInvert","CSSMathClamp","CSSLayerStatementRule","CSSLayerBlockRule","CSSKeywordValue","CSSKeyframesRule","CSSKeyframeRule","CSSImportRule","CSSImageValue","CSSGroupingRule","CSSFontPaletteValuesRule","CSSFontFaceRule","CSSCounterStyleRule","CSSContainerRule","CSSConditionRule","CSSAnimation","CSS","CSPViolationReportBody","CDATASection","ByteLengthQueuingStrategy","BrowserCaptureMediaStreamTrack","BroadcastChannel","BlobEvent","Blob","BiquadFilterNode","BeforeUnloadEvent","BeforeInstallPromptEvent","BaseAudioContext","BarProp","AudioWorkletNode","AudioSinkInfo","AudioScheduledSourceNode","AudioProcessingEvent","AudioParamMap","AudioParam","AudioNode","AudioListener","AudioDestinationNode","AudioData","AudioContext","AudioBufferSourceNode","AudioBuffer","Attr","AnimationTimeline","AnimationPlaybackEvent","AnimationEvent","AnimationEffect","Animation","AnalyserNode","AbstractRange","AbortSignal","AbortController","window","self","document","name","location","customElements","history","navigation","locationbar","menubar","personalbar","scrollbars","statusbar","toolbar","status","closed","frames","length","top","opener","parent","frameElement","navigator","origin","external","screen","innerWidth","innerHeight","scrollX","pageXOffset","scrollY","pageYOffset","visualViewport","screenX","screenY","outerWidth","outerHeight","devicePixelRatio","event","clientInformation","offscreenBuffering","screenLeft","screenTop","styleMedia","onsearch","trustedTypes","performance","onappinstalled","onbeforeinstallprompt","crypto","indexedDB","sessionStorage","localStorage","onbeforexrselect","onabort","onbeforeinput","onbeforematch","onbeforetoggle","onblur","oncancel","oncanplay","oncanplaythrough","onchange","onclick","onclose","oncontentvisibilityautostatechange","oncontextlost","oncontextmenu","oncontextrestored","oncuechange","ondblclick","ondrag","ondragend","ondragenter","ondragleave","ondragover","ondragstart","ondrop","ondurationchange","onemptied","onended","onerror","onfocus","onformdata","oninput","oninvalid","onkeydown","onkeypress","onkeyup","onload","onloadeddata","onloadedmetadata","onloadstart","onmousedown","onmouseenter","onmouseleave","onmousemove","onmouseout","onmouseover","onmouseup","onmousewheel","onpause","onplay","onplaying","onprogress","onratechange","onreset","onresize","onscroll","onsecuritypolicyviolation","onseeked","onseeking","onselect","onslotchange","onstalled","onsubmit","onsuspend","ontimeupdate","ontoggle","onvolumechange","onwaiting","onwebkitanimationend","onwebkitanimationiteration","onwebkitanimationstart","onwebkittransitionend","onwheel","onauxclick","ongotpointercapture","onlostpointercapture","onpointerdown","onpointermove","onpointerrawupdate","onpointerup","onpointercancel","onpointerover","onpointerout","onpointerenter","onpointerleave","onselectstart","onselectionchange","onanimationend","onanimationiteration","onanimationstart","ontransitionrun","ontransitionstart","ontransitionend","ontransitioncancel","onafterprint","onbeforeprint","onbeforeunload","onhashchange","onlanguagechange","onmessage","onmessageerror","onoffline","ononline","onpagehide","onpageshow","onpopstate","onrejectionhandled","onstorage","onunhandledrejection","onunload","isSecureContext","crossOriginIsolated","scheduler","alert","atob","blur","btoa","cancelAnimationFrame","cancelIdleCallback","captureEvents","clearInterval","clearTimeout","close","confirm","createImageBitmap","fetch","find","focus","getComputedStyle","getSelection","matchMedia","moveBy","moveTo","open","postMessage","print","prompt","queueMicrotask","releaseEvents","reportError","requestAnimationFrame","requestIdleCallback","resizeBy","resizeTo","scroll","scrollBy","scrollTo","setInterval","setTimeout","stop","structuredClone","webkitCancelAnimationFrame","webkitRequestAnimationFrame","Iterator","chrome","WebAssembly","caches","cookieStore","ondevicemotion","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er","PushSubscription","PushSubscriptionOptions","RTCDataChannel","RemotePlayback","RestrictionTarget","SharedStorage","SharedStorageWorklet","SharedWorker","SnapEvent","SpeechSynthesis","SpeechSynthesisErrorEvent","SpeechSynthesisEvent","SpeechSynthesisUtterance","SpeechSynthesisVoice","WebSocketError","WebSocketStream","webkitSpeechGrammar","webkitSpeechGrammarList","webkitSpeechRecognition","webkitSpeechRecognitionError","webkitSpeechRecognitionEvent","webkitRequestFileSystem","webkitResolveLocalFileSystemURL"];
const browserKeys = ['dir', 'dirxml', 'profile', 'profileEnd', 'clear', 'table', 'keys', 'values', 'debug', 'undebug', 'monitor', 'unmonitor', 'inspect', 'copy', 'queryObjects', '$_', '$0', '$1', '$2', '$3', '$4', 'getEventListeners', 'getAccessibleName', 'getAccessibleRole', 'monitorEvents', 'unmonitorEvents', '$', '$$', '$x'];
window.myFooKey = "foobar"; // adds a custom key to the window object
const windowKeys = Reflect.ownKeys(window);
const otherKeys = windowKeys.filter(x => !defaultKeys.includes(x))
.filter(x => !browserKeys.includes(x));
console.log(otherKeys);In this situation, you will be able to get any key that truly has been bound to a given window object by a external library, for instance.
Did you know that there are
windowkeys present in a browser that are not necessarily present in others? For instance, the Edge browser has more than 30 keys that don't exist in Chrome (as of March 2025):['WebGLObject', 'ViewTransitionTypeSet', 'ReportBody', 'PerformanceScriptTiming', 'PerformanceLongAnimationFrameTiming', 'MediaStreamTrackAudioStats', 'CloseWatcher', 'CSSPositionTryRule', 'CSSPositionTryDescriptors', 'CSSNestedDeclarations', 'CSPViolationReportBody', 'AICreateMonitor', 'ProtectedAudience', 'DevicePosture', 'FileSystemObserver', 'NotRestoredReasonDetails', 'NotRestoredReasons', 'PressureObserver', 'PressureRecord', 'XRHand', 'XRJointPose', 'XRJointSpace', 'onpageswap', 'onpagereveal', 'onscrollsnapchange', 'onscrollsnapchanging', 'CSSMarginRule', 'CSSViewTransitionRule', 'CaretPosition', 'ChapterInformation', 'NavigationActivation', 'PageRevealEvent', 'PageSwapEvent', 'RestrictionTarget', 'SnapEvent', 'WebSocketError', 'WebSocketStream']
window