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<!DOCTYPE html><html class="default" lang="en" data-base=".."><head><meta charset="utf-8"/><meta http-equiv="x-ua-compatible" content="IE=edge"/><title>W3CTraceContextPropagator | OpenTelemetry SDK</title><meta name="description" content="Documentation for OpenTelemetry SDK"/><meta name="viewport" content="width=device-width, initial-scale=1"/><link rel="stylesheet" href="../assets/style.css"/><link rel="stylesheet" href="../assets/highlight.css"/><script defer src="../assets/main.js"></script><script async src="../assets/icons.js" id="tsd-icons-script"></script><script async src="../assets/search.js" id="tsd-search-script"></script><script async src="../assets/navigation.js" id="tsd-nav-script"></script><script async src="../assets/hierarchy.js" id="tsd-hierarchy-script"></script></head><body><script>document.documentElement.dataset.theme = localStorage.getItem("tsd-theme") || "os";document.body.style.display="none";setTimeout(() => app?app.showPage():document.body.style.removeProperty("display"),500)</script><header class="tsd-page-toolbar"><div class="tsd-toolbar-contents container"><div class="table-cell" id="tsd-search"><div class="field"><label for="tsd-search-field" class="tsd-widget tsd-toolbar-icon search no-caption"><svg width="16" height="16" viewBox="0 0 16 16" fill="none" aria-hidden="true"><use href="../assets/icons.svg#icon-search"></use></svg></label><input type="text" id="tsd-search-field" aria-label="Search"/></div><div class="field"><div id="tsd-toolbar-links"></div></div><ul class="results"><li class="state loading">Preparing search index...</li><li class="state failure">The search index is not available</li></ul><a href="../index.html" class="title">OpenTelemetry SDK</a></div><div class="table-cell" id="tsd-widgets"><a href="#" class="tsd-widget tsd-toolbar-icon menu no-caption" data-toggle="menu" aria-label="Menu"><svg width="16" height="16" viewBox="0 0 16 16" fill="none" aria-hidden="true"><use href="../assets/icons.svg#icon-menu"></use></svg></a></div></div></header><div class="container container-main"><div class="col-content"><div class="tsd-page-title"><ul class="tsd-breadcrumb"><li><a href="../index.html">OpenTelemetry SDK</a></li><li><a href="../modules/_opentelemetry_sdk-node.html">@opentelemetry/sdk-node</a></li><li><a href="../modules/_opentelemetry_sdk-node.core.html">core</a></li><li><a href="_opentelemetry_sdk-node.core.W3CTraceContextPropagator.html">W3CTraceContextPropagator</a></li></ul><h1>Class W3CTraceContextPropagator</h1></div><section class="tsd-panel tsd-comment"><div class="tsd-comment tsd-typography"><p>Propagates <a href="../interfaces/_opentelemetry_sdk-node._opentelemetry_api.SpanContext.html" class="tsd-kind-interface">SpanContext</a> through Trace Context format propagation.</p>
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<p>Based on the Trace Context specification:
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<a href="https://www.w3.org/TR/trace-context/">https://www.w3.org/TR/trace-context/</a></p>
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</div><div class="tsd-comment tsd-typography"></div></section><section class="tsd-panel"><h4>Implements</h4><ul class="tsd-hierarchy"><li><a href="../modules/_opentelemetry_sdk-node._opentelemetry_api.html" class="tsd-signature-type tsd-kind-namespace">@opentelemetry/api</a><span class="tsd-signature-symbol">.</span><a href="../interfaces/_opentelemetry_sdk-node._opentelemetry_api.TextMapPropagator.html" class="tsd-signature-type tsd-kind-interface">TextMapPropagator</a></li></ul></section><aside class="tsd-sources"><ul><li>Defined in packages/opentelemetry-core/build/src/trace/W3CTraceContextPropagator.d.ts:21</li></ul></aside><section class="tsd-panel-group tsd-index-group"><section class="tsd-panel tsd-index-panel"><details class="tsd-index-content tsd-accordion" open><summary class="tsd-accordion-summary tsd-index-summary"><h5 class="tsd-index-heading uppercase" role="button" aria-expanded="false" tabIndex="0"><svg width="16" height="16" viewBox="0 0 16 16" fill="none" aria-hidden="true"><use href="../assets/icons.svg#icon-chevronSmall"></use></svg> Index</h5></summary><div class="tsd-accordion-details"><section class="tsd-index-section"><h3 class="tsd-index-heading">Constructors</h3><div class="tsd-index-list"><a href="_opentelemetry_sdk-node.core.W3CTraceContextPropagator.html#constructor" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Constructor"><use href="../assets/icons.svg#icon-512"></use></svg><span>constructor</span></a>
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</div></section><section class="tsd-index-section"><h3 class="tsd-index-heading">Methods</h3><div class="tsd-index-list"><a href="_opentelemetry_sdk-node.core.W3CTraceContextPropagator.html#extract" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../assets/icons.svg#icon-2048"></use></svg><span>extract</span></a>
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<a href="_opentelemetry_sdk-node.core.W3CTraceContextPropagator.html#fields" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../assets/icons.svg#icon-2048"></use></svg><span>fields</span></a>
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<a href="_opentelemetry_sdk-node.core.W3CTraceContextPropagator.html#inject" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../assets/icons.svg#icon-2048"></use></svg><span>inject</span></a>
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</div></section></div></details></section></section><details class="tsd-panel-group tsd-member-group tsd-accordion" open><summary class="tsd-accordion-summary" data-key="section-Constructors"><h2><svg width="20" height="20" viewBox="0 0 24 24" fill="none" aria-hidden="true"><use href="../assets/icons.svg#icon-chevronDown"></use></svg> Constructors</h2></summary><section><section class="tsd-panel tsd-member"><a id="constructor" class="tsd-anchor"></a><h3 class="tsd-anchor-link"><span>constructor</span><a href="#constructor" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul class="tsd-signatures"><li class=""><div class="tsd-signature tsd-anchor-link"><a id="constructorw3ctracecontextpropagator" class="tsd-anchor"></a><span class="tsd-signature-keyword">new</span> <span class="tsd-kind-constructor-signature">W3CTraceContextPropagator</span><span class="tsd-signature-symbol">()</span><span class="tsd-signature-symbol">:</span> <a href="../modules/_opentelemetry_sdk-node.core.html" class="tsd-signature-type tsd-kind-namespace">core</a><span class="tsd-signature-symbol">.</span><a href="_opentelemetry_sdk-node.core.W3CTraceContextPropagator.html" class="tsd-signature-type tsd-kind-class">W3CTraceContextPropagator</a><a href="#constructorw3ctracecontextpropagator" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></div><div class="tsd-description"><h4 class="tsd-returns-title">Returns <a href="../modules/_opentelemetry_sdk-node.core.html" class="tsd-signature-type tsd-kind-namespace">core</a><span class="tsd-signature-symbol">.</span><a href="_opentelemetry_sdk-node.core.W3CTraceContextPropagator.html" class="tsd-signature-type tsd-kind-class">W3CTraceContextPropagator</a></h4></div></li></ul></section></section></details><details class="tsd-panel-group tsd-member-group tsd-accordion" open><summary class="tsd-accordion-summary" data-key="section-Methods"><h2><svg width="20" height="20" viewBox="0 0 24 24" fill="none" aria-hidden="true"><use href="../assets/icons.svg#icon-chevronDown"></use></svg> Methods</h2></summary><section><section class="tsd-panel tsd-member"><a id="extract" class="tsd-anchor"></a><h3 class="tsd-anchor-link"><span>extract</span><a href="#extract" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul class="tsd-signatures"><li class=""><div class="tsd-signature tsd-anchor-link"><a id="extract-1" class="tsd-anchor"></a><span class="tsd-kind-call-signature">extract</span><span class="tsd-signature-symbol">(</span><br/> <span class="tsd-kind-parameter">context</span><span class="tsd-signature-symbol">:</span> <a href="../modules/_opentelemetry_sdk-node._opentelemetry_api.html" class="tsd-signature-type tsd-kind-namespace">@opentelemetry/api</a><span class="tsd-signature-symbol">.</span><a href="../interfaces/_opentelemetry_sdk-node._opentelemetry_api.Context.html" class="tsd-signature-type tsd-kind-interface">Context</a><span class="tsd-signature-symbol">,</span><br/> <span class="tsd-kind-parameter">carrier</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">unknown</span><span class="tsd-signature-symbol">,</span><br/> <span class="tsd-kind-parameter">getter</span><span class="tsd-signature-symbol">:</span> <a href="../modules/_opentelemetry_sdk-node._opentelemetry_api.html" class="tsd-signature-type tsd-kind-namespace">@opentelemetry/api</a><span class="tsd-signature-symbol">.</span><a href="../interfaces/_opentelemetry_sdk-node._opentelemetry_api.TextMapGetter.html" class="tsd-signature-type tsd-kind-interface">TextMapGetter</a><span class="tsd-signature-symbol">,</span><br/><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">:</span> <a href="../modules/_opentelemetry_sdk-node._opentelemetry_api.html" class="tsd-signature-type tsd-kind-namespace">@opentelemetry/api</a><span class="tsd-signature-symbol">.</span><a href="../interfaces/_opentelemetry_sdk-node._opentelemetry_api.Context.html" class="tsd-signature-type tsd-kind-interface">Context</a><a href="#extract-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></div><div class="tsd-description"><div class="tsd-comment tsd-typography"><p>Given a <code>Context</code> and a carrier, extract context values from a
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carrier and return a new context, created from the old context, with the
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extracted values.</p>
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</div><div class="tsd-parameters"><h4 class="tsd-parameters-title">Parameters</h4><ul class="tsd-parameter-list"><li><span><span class="tsd-kind-parameter">context</span>: <a href="../modules/_opentelemetry_sdk-node._opentelemetry_api.html" class="tsd-signature-type tsd-kind-namespace">@opentelemetry/api</a><span class="tsd-signature-symbol">.</span><a href="../interfaces/_opentelemetry_sdk-node._opentelemetry_api.Context.html" class="tsd-signature-type tsd-kind-interface">Context</a></span><div class="tsd-comment tsd-typography"><p>the Context from which to extract values to transmit over
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the wire.</p>
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</div><div class="tsd-comment tsd-typography"></div></li><li><span><span class="tsd-kind-parameter">carrier</span>: <span class="tsd-signature-type">unknown</span></span><div class="tsd-comment tsd-typography"><p>the carrier of propagation fields, such as http request
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headers.</p>
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</div><div class="tsd-comment tsd-typography"></div></li><li><span><span class="tsd-kind-parameter">getter</span>: <a href="../modules/_opentelemetry_sdk-node._opentelemetry_api.html" class="tsd-signature-type tsd-kind-namespace">@opentelemetry/api</a><span class="tsd-signature-symbol">.</span><a href="../interfaces/_opentelemetry_sdk-node._opentelemetry_api.TextMapGetter.html" class="tsd-signature-type tsd-kind-interface">TextMapGetter</a></span><div class="tsd-comment tsd-typography"><p>an optional <a href="../interfaces/_opentelemetry_sdk-node._opentelemetry_api.TextMapGetter.html" class="tsd-kind-interface">TextMapGetter</a>. If undefined, keys will be all
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own properties, and keys will be accessed by direct object access.</p>
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</div><div class="tsd-comment tsd-typography"></div></li></ul></div><h4 class="tsd-returns-title">Returns <a href="../modules/_opentelemetry_sdk-node._opentelemetry_api.html" class="tsd-signature-type tsd-kind-namespace">@opentelemetry/api</a><span class="tsd-signature-symbol">.</span><a href="../interfaces/_opentelemetry_sdk-node._opentelemetry_api.Context.html" class="tsd-signature-type tsd-kind-interface">Context</a></h4><div class="tsd-comment tsd-typography"></div><aside class="tsd-sources"><p>Implementation of <a href="../interfaces/_opentelemetry_sdk-node._opentelemetry_api.TextMapPropagator.html">TextMapPropagator</a>.<a href="../interfaces/_opentelemetry_sdk-node._opentelemetry_api.TextMapPropagator.html#extract">extract</a></p><ul><li>Defined in packages/opentelemetry-core/build/src/trace/W3CTraceContextPropagator.d.ts:23</li></ul></aside></div></li></ul></section><section class="tsd-panel tsd-member"><a id="fields" class="tsd-anchor"></a><h3 class="tsd-anchor-link"><span>fields</span><a href="#fields" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul class="tsd-signatures"><li class=""><div class="tsd-signature tsd-anchor-link"><a id="fields-1" class="tsd-anchor"></a><span class="tsd-kind-call-signature">fields</span><span class="tsd-signature-symbol">()</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">[]</span><a href="#fields-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></div><div class="tsd-description"><div class="tsd-comment tsd-typography"><p>Return a list of all fields which may be used by the propagator.</p>
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</div><h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">[]</span></h4><div class="tsd-comment tsd-typography"></div><aside class="tsd-sources"><p>Implementation of <a href="../interfaces/_opentelemetry_sdk-node._opentelemetry_api.TextMapPropagator.html">TextMapPropagator</a>.<a href="../interfaces/_opentelemetry_sdk-node._opentelemetry_api.TextMapPropagator.html#fields">fields</a></p><ul><li>Defined in packages/opentelemetry-core/build/src/trace/W3CTraceContextPropagator.d.ts:24</li></ul></aside></div></li></ul></section><section class="tsd-panel tsd-member"><a id="inject" class="tsd-anchor"></a><h3 class="tsd-anchor-link"><span>inject</span><a href="#inject" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul class="tsd-signatures"><li class=""><div class="tsd-signature tsd-anchor-link"><a id="inject-1" class="tsd-anchor"></a><span class="tsd-kind-call-signature">inject</span><span class="tsd-signature-symbol">(</span><br/> <span class="tsd-kind-parameter">context</span><span class="tsd-signature-symbol">:</span> <a href="../modules/_opentelemetry_sdk-node._opentelemetry_api.html" class="tsd-signature-type tsd-kind-namespace">@opentelemetry/api</a><span class="tsd-signature-symbol">.</span><a href="../interfaces/_opentelemetry_sdk-node._opentelemetry_api.Context.html" class="tsd-signature-type tsd-kind-interface">Context</a><span class="tsd-signature-symbol">,</span><br/> <span class="tsd-kind-parameter">carrier</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">unknown</span><span class="tsd-signature-symbol">,</span><br/> <span class="tsd-kind-parameter">setter</span><span class="tsd-signature-symbol">:</span> <a href="../modules/_opentelemetry_sdk-node._opentelemetry_api.html" class="tsd-signature-type tsd-kind-namespace">@opentelemetry/api</a><span class="tsd-signature-symbol">.</span><a href="../interfaces/_opentelemetry_sdk-node._opentelemetry_api.TextMapSetter.html" class="tsd-signature-type tsd-kind-interface">TextMapSetter</a><span class="tsd-signature-symbol">,</span><br/><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">void</span><a href="#inject-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></div><div class="tsd-description"><div class="tsd-comment tsd-typography"><p>Injects values from a given <code>Context</code> into a carrier.</p>
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<p>OpenTelemetry defines a common set of format values (TextMapPropagator),
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and each has an expected <code>carrier</code> type.</p>
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</div><div class="tsd-parameters"><h4 class="tsd-parameters-title">Parameters</h4><ul class="tsd-parameter-list"><li><span><span class="tsd-kind-parameter">context</span>: <a href="../modules/_opentelemetry_sdk-node._opentelemetry_api.html" class="tsd-signature-type tsd-kind-namespace">@opentelemetry/api</a><span class="tsd-signature-symbol">.</span><a href="../interfaces/_opentelemetry_sdk-node._opentelemetry_api.Context.html" class="tsd-signature-type tsd-kind-interface">Context</a></span><div class="tsd-comment tsd-typography"><p>the Context from which to extract values to transmit over
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the wire.</p>
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</div><div class="tsd-comment tsd-typography"></div></li><li><span><span class="tsd-kind-parameter">carrier</span>: <span class="tsd-signature-type">unknown</span></span><div class="tsd-comment tsd-typography"><p>the carrier of propagation fields, such as http request
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headers.</p>
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</div><div class="tsd-comment tsd-typography"></div></li><li><span><span class="tsd-kind-parameter">setter</span>: <a href="../modules/_opentelemetry_sdk-node._opentelemetry_api.html" class="tsd-signature-type tsd-kind-namespace">@opentelemetry/api</a><span class="tsd-signature-symbol">.</span><a href="../interfaces/_opentelemetry_sdk-node._opentelemetry_api.TextMapSetter.html" class="tsd-signature-type tsd-kind-interface">TextMapSetter</a></span><div class="tsd-comment tsd-typography"><p>an optional <a href="../interfaces/_opentelemetry_sdk-node._opentelemetry_api.TextMapSetter.html" class="tsd-kind-interface">TextMapSetter</a>. If undefined, values will be
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set by direct object assignment.</p>
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</div><div class="tsd-comment tsd-typography"></div></li></ul></div><h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">void</span></h4><div class="tsd-comment tsd-typography"></div><aside class="tsd-sources"><p>Implementation of <a href="../interfaces/_opentelemetry_sdk-node._opentelemetry_api.TextMapPropagator.html">TextMapPropagator</a>.<a href="../interfaces/_opentelemetry_sdk-node._opentelemetry_api.TextMapPropagator.html#inject">inject</a></p><ul><li>Defined in packages/opentelemetry-core/build/src/trace/W3CTraceContextPropagator.d.ts:22</li></ul></aside></div></li></ul></section></section></details></div><div class="col-sidebar"><div class="page-menu"><div class="tsd-navigation settings"><details class="tsd-accordion"><summary class="tsd-accordion-summary"><h3><svg width="20" height="20" viewBox="0 0 24 24" fill="none" aria-hidden="true"><use href="../assets/icons.svg#icon-chevronDown"></use></svg>Settings</h3></summary><div class="tsd-accordion-details"><div class="tsd-filter-visibility"><span class="settings-label">Member Visibility</span><ul id="tsd-filter-options"><li class="tsd-filter-item"><label class="tsd-filter-input"><input type="checkbox" id="tsd-filter-protected" name="protected"/><svg width="32" height="32" viewBox="0 0 32 32" aria-hidden="true"><rect class="tsd-checkbox-background" width="30" height="30" x="1" y="1" rx="6" fill="none"></rect><path class="tsd-checkbox-checkmark" d="M8.35422 16.8214L13.2143 21.75L24.6458 10.25" stroke="none" stroke-width="3.5" stroke-linejoin="round" fill="none"></path></svg><span>Protected</span></label></li><li class="tsd-filter-item"><label class="tsd-filter-input"><input type="checkbox" id="tsd-filter-inherited" name="inherited" checked/><svg width="32" height="32" viewBox="0 0 32 32" aria-hidden="true"><rect class="tsd-checkbox-background" width="30" height="30" x="1" y="1" rx="6" fill="none"></rect><path class="tsd-checkbox-checkmark" d="M8.35422 16.8214L13.2143 21.75L24.6458 10.25" stroke="none" stroke-width="3.5" stroke-linejoin="round" fill="none"></path></svg><span>Inherited</span></label></li><li class="tsd-filter-item"><label class="tsd-filter-input"><input type="checkbox" id="tsd-filter-external" name="external"/><svg width="32" height="32" viewBox="0 0 32 32" aria-hidden="true"><rect class="tsd-checkbox-background" width="30" height="30" x="1" y="1" rx="6" fill="none"></rect><path class="tsd-checkbox-checkmark" d="M8.35422 16.8214L13.2143 21.75L24.6458 10.25" stroke="none" stroke-width="3.5" stroke-linejoin="round" fill="none"></path></svg><span>External</span></label></li></ul></div><div class="tsd-theme-toggle"><label class="settings-label" for="tsd-theme">Theme</label><select id="tsd-theme"><option value="os">OS</option><option value="light">Light</option><option value="dark">Dark</option></select></div></div></details></div><details open class="tsd-accordion tsd-page-navigation"><summary class="tsd-accordion-summary"><h3><svg width="20" height="20" viewBox="0 0 24 24" fill="none" aria-hidden="true"><use href="../assets/icons.svg#icon-chevronDown"></use></svg>On This Page</h3></summary><div class="tsd-accordion-details"><details open class="tsd-accordion tsd-page-navigation-section"><summary class="tsd-accordion-summary" data-key="section-Constructors"><svg width="20" height="20" viewBox="0 0 24 24" fill="none" aria-hidden="true"><use href="../assets/icons.svg#icon-chevronDown"></use></svg>Constructors</summary><div><a href="#constructor" class=""><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Constructor"><use href="../assets/icons.svg#icon-512"></use></svg><span>constructor</span></a></div></details><details open class="tsd-accordion tsd-page-navigation-section"><summary class="tsd-accordion-summary" data-key="section-Methods"><svg width="20" height="20" viewBox="0 0 24 24" fill="none" aria-hidden="true"><use href="../assets/icons.svg#icon-chevronDown"></use></svg>Methods</summary><div><a href="#extract" class=""><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../assets/icons.svg#icon-2048"></use></svg><span>extract</span></a><a href="#fields" class=""><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../assets/icons.svg#icon-2048"></use></svg><span>fields</span></a><a href="#inject" class=""><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../assets/icons.svg#icon-2048"></use></svg><span>inject</span></a></div></details></div></details></div><div class="site-menu"><nav class="tsd-navigation"><a href="../index.html">OpenTelemetry SDK</a><ul class="tsd-small-nested-navigation" id="tsd-nav-container"><li>Loading...</li></ul></nav></div></div></div><footer><p class="tsd-generator">Generated using <a href="https://typedoc.org/" target="_blank">TypeDoc</a></p></footer><div class="overlay"></div></body></html>
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