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class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item"><a class="breadcrumbs__link" itemprop="item" href="/docs/category/concepts">Concepts</a><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active">Evaluation Context<meta itemprop="position" content="2"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Evaluation Context</h1></header>  The <a href="/specification/glossary#evaluation-context">evaluation context</a> is a container for arbitrary contextual data that can be used as a basis for dynamic evaluation. Static data such as the host or an identifier for the application can be configured globally. Dynamic evaluation context, such as the IP address of the client in a web application, can be implicitly propagated or explicitly passed to during flag evaluation, and can be merged with static values.  <div class="video-container"><link rel="preload" href="https://i.ytimg.com/vi_webp/L4iSvkxVnFI/maxresdefault.webp" as="image"><article class="yt-lite" data-title="YouTube video player" style="background-image:url(https://i.ytimg.com/vi_webp/L4iSvkxVnFI/maxresdefault.webp);--aspect-ratio:56.25%"><button type="button" class="lty-playbtn" aria-label="Watch YouTube video player"></button></article></div> <h2 class="anchor anchorWithStickyNavbar_LWe7" id="providing-evaluation-context">Providing Evaluation Context<a href="#providing-evaluation-context" class="hash-link" aria-label="Direct link to Providing Evaluation Context" title="Direct link to Providing Evaluation Context"></a></h2> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="dynamic-context-implementations-server-side-sdks">Dynamic Context Implementations (Server-side SDKs)<a href="#dynamic-context-implementations-server-side-sdks" class="hash-link" aria-label="Direct link to Dynamic Context Implementations (Server-side SDKs)" title="Direct link to Dynamic Context Implementations (Server-side SDKs)"></a></h3> In <a href="/docs/reference/concepts/sdk-paradigms#dynamic-context-paradigm-server-side-sdks">server-side SDKs</a>, values relevant for flag evaluation can be included in the evaluation context at multiple points: globally (on the top level API), on the client, and at the point of flag evaluation (invocation). <div class="tabs-container tabList__CuJ"><ul role="tablist" aria-orientation="horizontal" class="tabs"><li role="tab" tabindex="0" aria-selected="true" class="tabs__item tabItem_LNqP tabs__item--active">TypeScript</li><li role="tab" tabindex="-1" aria-selected="false" class="tabs__item tabItem_LNqP">Java</li><li role="tab" tabindex="-1" aria-selected="false" class="tabs__item tabItem_LNqP">C#</li><li role="tab" tabindex="-1" aria-selected="false" class="tabs__item tabItem_LNqP">Go</li><li role="tab" tabindex="-1" aria-selected="false" class="tabs__item tabItem_LNqP">PHP</li><li role="tab" tabindex="-1" aria-selected="false" class="tabs__item tabItem_LNqP">Python</li></ul><div class="margin-top--md"><div role="tabpanel" class="tabItem_Ymn6"><div class="language-ts codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-ts codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">// add a value to the global context OpenFeature.setContext({ myGlobalKey: 'myGlobalValue' }); // add a value to the client context const client = OpenFeature.getClient(); client.setContext({ myClientKey: 'myClientValue' }); // add a value to the invocation context const context: EvaluationContext = { myInvocationKey: 'myInvocationValue', }; const boolValue = await client.getBooleanValue('boolFlag', false, context); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div></div><div role="tabpanel" class="tabItem_Ymn6" hidden=""><div class="language-java codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-java codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">// add a value to the global context OpenFeatureAPI api = OpenFeatureAPI.getInstance(); api.setEvaluationContext(new MutableContext().add("myGlobalKey", "myGlobalValue")); // add a value to the client context Client client = api.getClient(); client.setEvaluationContext(new MutableContext().add("myClientKey", "myClientValue")); // add a value to the invocation context EvaluationContext context = new MutableContext(); context.addStringAttribute("myInvocationKey", "myInvocationValue") Boolean boolValue = client.getBooleanValue("boolFlag", false, context); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div></div><div role="tabpanel" class="tabItem_Ymn6" hidden=""><div class="language-csharp codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-csharp codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">// add a value to the global context Api api = Api.Instance; api.SetContext(new EvaluationContextBuilder().Set("myGlobalKey", "myGlobalValue").Build()); // add a value to the client context FeatureClient client = api.GetClient(); client.SetContext(new EvaluationContextBuilder().Set("myClientKey", "myClientValue").Build()); // add a value to the invocation context var context = new EvaluationContext() .Set("myInvocationKey", "myInvocationValue") .Build(); var boolValue = await client.GetBooleanValue("boolFlag", false, context); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div></div><div role="tabpanel" class="tabItem_Ymn6" hidden=""><div class="language-go codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-go codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv"> // add a value to the global context openfeature.SetEvaluationContext(openfeature.NewEvaluationContext( "", map[string]interface{}{ "myGlobalKey": "myGlobalValue", }, )) // add a value to the client context client := openfeature.NewClient("my-app") client.SetEvaluationContext(openfeature.NewEvaluationContext( "", map[string]interface{}{ "myGlobalKey": "myGlobalValue", }, )) // add a value to the invocation context evalCtx := openfeature.NewEvaluationContext( "", map[string]interface{}{ "myInvocationKey": "myInvocationValue", }, ) boolValue, err := client.BooleanValue("boolFlag", false, evalCtx) </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div></div><div role="tabpanel" class="tabItem_Ymn6" hidden=""><div class="language-php codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-php codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">// add a value to the global context $api = OpenFeatureAPI.getInstance(); $api->setEvaluationContext(new EvaluationContext("targetingKey", ["myGlobalKey" => "myGlobalValue"])); // add a value to the client context $client = $api->getClient(); $client->setEvaluationContext(new EvaluationContext("targetingKey", ["myClientKey" => "myClientValue"])); // add a value to the invocation context $context = new EvaluationContext("targetingKey", ["myInvocationKey" => "myInvocationValue"]); $boolValue = $client->getBooleanValue("boolFlag", false, $context); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div></div><div role="tabpanel" class="tabItem_Ymn6" hidden=""><div class="language-python codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-python codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv"># add a value to the global context import openfeature.api context = EvaluationContext("targetingKey", {"myGlobalKey": "myGlobalValue"}) openfeature.api.set_evaluation_context(context) # add a value to the client context client = api.get_client() context = EvaluationContext("targetingKey", {"myClientKey": "myClientValue"}) client.set_evaluation_context(context) # add a value to the invocation context context = EvaluationContext("targetingKey", {"myInvocationKey": "myInvocationValue"}) bool_value = client.get_boolean_value("boolFlag", False, context) </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div></div></div></div> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="context-merging">Context merging<a href="#context-merging" class="hash-link" aria-label="Direct link to Context merging" title="Direct link to Context merging"></a></h4> At the point of flag evaluation, the evaluation context is merged, and duplicate values are overwritten as defined in the <a href="/specification/sections/evaluation-context#32-context-levels-and-merging">specification</a>. <h3 class="anchor anchorWithStickyNavbar_LWe7" id="static-context-implementations-client-side-sdks">Static Context Implementations (Client-side SDKs)<a href="#static-context-implementations-client-side-sdks" class="hash-link" aria-label="Direct link to Static Context Implementations (Client-side SDKs)" title="Direct link to Static Context Implementations (Client-side SDKs)"></a></h3> In <a href="/docs/reference/concepts/sdk-paradigms#static-context-paradigms-client-side-sdks">client-side SDKs</a>, values relevant for flag evaluation are set on the OpenFeature API object. In these implementations, this is an asynchronous operation associated with <a href="/docs/reference/concepts/sdk-paradigms#static-context-paradigms-client-side-sdks">provider reconciliation</a>. <div class="tabs-container tabList__CuJ"><ul role="tablist" aria-orientation="horizontal" class="tabs"><li role="tab" tabindex="0" aria-selected="true" class="tabs__item tabItem_LNqP tabs__item--active">TypeScript</li></ul><div class="margin-top--md"><div role="tabpanel" class="tabItem_Ymn6"><div class="language-ts codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-ts codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">// add a value to the context await OpenFeature.setContext({ myUserData: 'myUserValue' }); // the context is used for all feature flag evaluations automatically. const boolValue = await client.getBooleanValue('boolFlag', false); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div></div></div></div> <h2 class="anchor anchorWithStickyNavbar_LWe7" id="circular-structures-in-evaluation-context">Circular structures in Evaluation Context<a href="#circular-structures-in-evaluation-context" class="hash-link" aria-label="Direct link to Circular structures in Evaluation Context" title="Direct link to Circular structures in Evaluation Context"></a></h2> Many providers serialize the evaluation context as part of their operation. Be careful not to include circular structures in the evaluation context to avoid serialization issues. <h2 class="anchor anchorWithStickyNavbar_LWe7" id="targeting-key">Targeting Key<a href="#targeting-key" class="hash-link" aria-label="Direct link to Targeting Key" title="Direct link to Targeting Key"></a></h2> Many feature flag management systems require an identifier for the subject of flag evaluation. For many feature flag systems this is required in order to perform fractional evaluation or percentage-based rollouts deterministically. In the case of web applications or mobile apps, the subject is frequently an end user, but in other cases it could be a service or client application. The <code>evaluation context</code> includes an optional <code>targeting key</code> field for this purpose. The targeting key should contain a string uniquely identifying the subject (i.e.: a UUID, a hash of some user attribute such as an email, or the hostname of an application or service). Some <a href="/docs/reference/concepts/provider">providers</a> may require this field to be set to function correctly. <h2 class="anchor anchorWithStickyNavbar_LWe7" id="personally-identifiable-information-pii-considerations">Personally Identifiable Information (PII) Considerations<a href="#personally-identifiable-information-pii-considerations" class="hash-link" aria-label="Direct link to Personally Identifiable Information (PII) Considerations" title="Direct link to Personally Identifiable Information (PII) Considerations"></a></h2> Be thoughtful in your inclusion of personal data in the <code>evaluation context</code>. Such data is useful for targeting and dynamic evaluation, but you should consider how the <a href="/docs/reference/concepts/provider">provider</a> in use may handle or persist this data. Hooks (specifically hooks implementing the before stage) can be useful to restrict, filter or anonymize data in the <code>evaluation context</code>.</div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="row margin-top--sm theme-doc-footer-edit-meta-row"><div class="col"><a href="https://github.com/open-feature/openfeature.dev/edit/main/docs/reference/concepts/03-evaluation-context.mdx" target="_blank" rel="noopener noreferrer" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_JAkA"></div></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" 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