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class="breadcrumbs__link">Polyfills</span><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Intl.ListFormat</span><meta itemprop="position" content="2"></li></ul></nav><div class="tocCollapsible_zW8v theme-doc-toc-mobile tocMobile_Hun5"><button type="button" class="clean-btn tocCollapsibleButton_MpPC">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Intl.ListFormat</h1></header><p>A spec-compliant polyfill for Intl.ListFormat fully tested by the <a href="https://github.com/tc39/test262" target="_blank" rel="noopener noreferrer">official ECMAScript Conformance test suite</a></p>
<p><a href="https://www.npmjs.org/package/@formatjs/intl-listformat" target="_blank" rel="noopener noreferrer"><img decoding="async" loading="lazy" src="https://img.shields.io/npm/v/@formatjs/intl-listformat.svg?style=flat-square" alt="npm Version" class="img_q4K_"></a>
<img decoding="async" loading="lazy" src="https://badgen.net/bundlephobia/minzip/@formatjs/intl-listformat" alt="size" class="img_q4K_"></p>
<h2 class="anchor anchorWithStickyNavbar_VKkZ" id="installation">Installation<a href="#installation" class="hash-link" aria-label="Direct link to Installation" title="Direct link to Installation">​</a></h2>
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<div class="tabs-container tabList_Mlii"><ul role="tablist" aria-orientation="horizontal" class="tabs"><li role="tab" tabindex="0" aria-selected="true" class="tabs__item tabItem_P5p4 tabs__item--active">npm</li><li role="tab" tabindex="-1" aria-selected="false" class="tabs__item tabItem_P5p4">yarn</li></ul><div class="margin-top--md"><div role="tabpanel" class="tabItem_nQMB"><div class="language-sh codeBlockContainer_GIky theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_SSiY"><pre tabindex="0" class="prism-code language-sh codeBlock_AAA6 thin-scrollbar" style="color:#bfc7d5;background-color:#292d3e"><code class="codeBlockLines_dKky"><span class="token-line" style="color:#bfc7d5"><span class="token plain">npm i @formatjs/intl-listformat</span><br></span></code></pre><div class="buttonGroup_F6md"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_tzcC" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_vXBr"><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_Gjy7"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div></div><div role="tabpanel" class="tabItem_nQMB" hidden=""><div class="language-sh codeBlockContainer_GIky theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_SSiY"><pre tabindex="0" class="prism-code language-sh codeBlock_AAA6 thin-scrollbar" style="color:#bfc7d5;background-color:#292d3e"><code class="codeBlockLines_dKky"><span class="token-line" style="color:#bfc7d5"><span class="token plain">yarn add @formatjs/intl-listformat</span><br></span></code></pre><div class="buttonGroup_F6md"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_tzcC" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_vXBr"><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_Gjy7"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div></div></div></div>
<h2 class="anchor anchorWithStickyNavbar_VKkZ" id="requirements">Requirements<a href="#requirements" class="hash-link" aria-label="Direct link to Requirements" title="Direct link to Requirements">​</a></h2>
<ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/getCanonicalLocales" target="_blank" rel="noopener noreferrer"><code>Intl.getCanonicalLocales</code></a> or <a href="/docs/polyfills/intl-getcanonicallocales">polyfill</a></li>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/Locale" target="_blank" rel="noopener noreferrer"><code>Intl.Locale</code></a> or <a href="/docs/polyfills/intl-locale">polyfill</a>.</li>
</ul>
<h2 class="anchor anchorWithStickyNavbar_VKkZ" id="usage">Usage<a href="#usage" class="hash-link" aria-label="Direct link to Usage" title="Direct link to Usage">​</a></h2>
<h3 class="anchor anchorWithStickyNavbar_VKkZ" id="via-polyfill-fastlyio">Via polyfill-fastly.io<a href="#via-polyfill-fastlyio" class="hash-link" aria-label="Direct link to Via polyfill-fastly.io" title="Direct link to Via polyfill-fastly.io">​</a></h3>
<p>You can use <a href="https://polyfill-fastly.io/" target="_blank" rel="noopener noreferrer">polyfill-fastly.io URL Builder</a> to create a polyfill script tag for <code>Intl.ListFormat</code>. By default the created URL does not come with any locale data. In order to add locale data, append <code>Intl.ListFormat.~locale.&lt;locale&gt;</code> to your list of features. For example:</p>
<div class="language-html codeBlockContainer_GIky theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_SSiY"><pre tabindex="0" class="prism-code language-html codeBlock_AAA6 thin-scrollbar" style="color:#bfc7d5;background-color:#292d3e"><code class="codeBlockLines_dKky"><span class="token-line" style="color:#bfc7d5"><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">&lt;!-- Polyfill Intl.ListFormat, its dependencies &amp; `en` locale data --&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">&lt;</span><span class="token tag" style="color:rgb(255, 85, 114)">script</span><span class="token tag" style="color:rgb(255, 85, 114)"> </span><span class="token tag attr-name" style="color:rgb(255, 203, 107)">src</span><span class="token tag attr-value punctuation attr-equals" style="color:rgb(199, 146, 234)">=</span><span class="token tag attr-value punctuation" style="color:rgb(199, 146, 234)">&quot;</span><span class="token tag attr-value" style="color:rgb(255, 85, 114)">https://polyfill-fastly.io/v3/polyfill.min.js?features=Intl.ListFormat,Intl.ListFormat.~locale.en</span><span class="token tag attr-value punctuation" style="color:rgb(199, 146, 234)">&quot;</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">&gt;</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">&lt;/</span><span class="token tag" style="color:rgb(255, 85, 114)">script</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">&gt;</span><br></span></code></pre><div class="buttonGroup_F6md"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_tzcC" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_vXBr"><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_Gjy7"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div>
<h3 class="anchor anchorWithStickyNavbar_VKkZ" id="simple">Simple<a href="#simple" class="hash-link" aria-label="Direct link to Simple" title="Direct link to Simple">​</a></h3>
<div class="language-tsx codeBlockContainer_GIky theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_SSiY"><pre tabindex="0" class="prism-code language-tsx codeBlock_AAA6 thin-scrollbar" style="color:#bfc7d5;background-color:#292d3e"><code class="codeBlockLines_dKky"><span class="token-line" style="color:#bfc7d5"><span class="token keyword" style="font-style:italic">import</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">&#x27;@formatjs/intl-listformat/polyfill&#x27;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token keyword" style="font-style:italic">import</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">&#x27;@formatjs/intl-listformat/locale-data/en&#x27;</span><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">// locale-data for en</span><br></span></code></pre><div class="buttonGroup_F6md"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_tzcC" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_vXBr"><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_Gjy7"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div>
<h3 class="anchor anchorWithStickyNavbar_VKkZ" id="dynamic-import--capability-detection">Dynamic import + capability detection<a href="#dynamic-import--capability-detection" class="hash-link" aria-label="Direct link to Dynamic import + capability detection" title="Direct link to Dynamic import + capability detection">​</a></h3>
<div class="language-tsx codeBlockContainer_GIky theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_SSiY"><pre tabindex="0" class="prism-code language-tsx codeBlock_AAA6 thin-scrollbar" style="color:#bfc7d5;background-color:#292d3e"><code class="codeBlockLines_dKky"><span class="token-line" style="color:#bfc7d5"><span class="token keyword" style="font-style:italic">import</span><span class="token plain"> </span><span class="token imports punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token imports">shouldPolyfill</span><span class="token imports punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">from</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">&#x27;@formatjs/intl-listformat/should-polyfill&#x27;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token keyword" style="font-style:italic">async</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">function</span><span class="token plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">polyfill</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">locale</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token builtin" style="color:rgb(130, 170, 255)">string</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">  </span><span class="token keyword" style="font-style:italic">const</span><span class="token plain"> unsupportedLocale </span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">shouldPolyfill</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">locale</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">  </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">// This locale is supported</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">  </span><span class="token keyword" style="font-style:italic">if</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token operator" style="color:rgb(137, 221, 255)">!</span><span class="token plain">unsupportedLocale</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">    </span><span class="token keyword" style="font-style:italic">return</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">  </span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">  </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">// Load the polyfill 1st BEFORE loading data</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">  </span><span class="token keyword" style="font-style:italic">await</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">import</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">&#x27;@formatjs/intl-listformat/polyfill-force&#x27;</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">  </span><span class="token keyword" style="font-style:italic">await</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">import</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token template-string template-punctuation string" style="color:rgb(195, 232, 141)">`</span><span class="token template-string string" style="color:rgb(195, 232, 141)">@formatjs/intl-listformat/locale-data/</span><span class="token template-string interpolation interpolation-punctuation punctuation" style="color:rgb(199, 146, 234)">${</span><span class="token template-string interpolation">unsupportedLocale</span><span class="token template-string interpolation interpolation-punctuation punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token template-string template-punctuation string" style="color:rgb(195, 232, 141)">`</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><br></span></code></pre><div class="buttonGroup_F6md"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_tzcC" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_vXBr"><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_Gjy7"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div>
<h2 class="anchor anchorWithStickyNavbar_VKkZ" id="tests">Tests<a href="#tests" class="hash-link" aria-label="Direct link to Tests" title="Direct link to Tests">​</a></h2>
<p>This library is fully <a href="https://github.com/tc39/test262/tree/master/test/intl402/ListFormat" target="_blank" rel="noopener noreferrer">test262</a>-compliant.</p></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/formatjs/formatjs/edit/main/website/docs/polyfills/intl-listformat.md" target="_blank" rel="noopener noreferrer" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_KVys" 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_XIYD"><span class="theme-last-updated">Last updated<!-- --> on <b><time datetime="2025-04-04T10:16:29.000Z" itemprop="dateModified">Apr 4, 2025</time></b> by <b>renovate[bot]</b></span></div></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/docs/polyfills/intl-getcanonicallocales"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Intl.getCanonicalLocales</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/polyfills/intl-locale"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Intl.Locale</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_rRp3 thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#installation" class="table-of-contents__link toc-highlight">Installation</a></li><li><a href="#requirements" class="table-of-contents__link toc-highlight">Requirements</a></li><li><a href="#usage" class="table-of-contents__link toc-highlight">Usage</a><ul><li><a href="#via-polyfill-fastlyio" class="table-of-contents__link toc-highlight">Via polyfill-fastly.io</a></li><li><a href="#simple" class="table-of-contents__link toc-highlight">Simple</a></li><li><a href="#dynamic-import--capability-detection" class="table-of-contents__link toc-highlight">Dynamic import + capability detection</a></li></ul></li><li><a href="#tests" class="table-of-contents__link toc-highlight">Tests</a></li></ul></div></div></div></div></main></div></div></div><footer class="footer footer--dark"><div class="container container-fluid"><div class="row footer__links"><div class="col footer__col"><div class="footer__title">Docs</div><ul class="footer__items clean-list"><li class="footer__item"><a class="footer__link-item" href="/docs/getting-started/installation">Getting Started</a></li><li class="footer__item"><a class="footer__link-item" href="/docs/polyfills">Polyfills</a></li><li class="footer__item"><a class="footer__link-item" href="/docs/intl-messageformat">Libraries</a></li><li class="footer__item"><a class="footer__link-item" href="/docs/tooling/cli">Tooling</a></li></ul></div><div class="col footer__col"><div class="footer__title">Community</div><ul class="footer__items clean-list"><li class="footer__item"><a href="https://stackoverflow.com/questions/tagged/formatjs" target="_blank" rel="noopener noreferrer" class="footer__link-item">Stack Overflow<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_x79Z"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li><li class="footer__item"><a href="https://formatjs.slack.com/" target="_blank" rel="noopener noreferrer" class="footer__link-item">Slack<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_x79Z"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li></ul></div><div class="col footer__col"><div class="footer__title">Social</div><ul class="footer__items clean-list"><li class="footer__item"><a href="https://github.com/formatjs/formatjs" target="_blank" rel="noopener noreferrer" class="footer__link-item">GitHub<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_x79Z"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li></ul></div></div><div class="footer__bottom text--center"><div class="footer__copyright">Copyright © 2025 FormatJS. Built with Docusaurus.</div></div></div></footer></div>
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