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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 class="breadcrumbs__item"><span class="breadcrumbs__link">Guides</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">Runtime Requirements</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>Runtime Requirements</h1></header><h2 class="anchor anchorWithStickyNavbar_VKkZ" id="browser">Browser<a href="#browser" class="hash-link" aria-label="Direct link to Browser" title="Direct link to Browser"></a></h2>
<div class="theme-admonition theme-admonition-info admonition_zW3T alert alert--info"><div class="admonitionHeading_WfvQ"><span class="admonitionIcon_nNYq"><svg viewBox="0 0 14 16"><path fill-rule="evenodd" d="M7 2.3c3.14 0 5.7 2.56 5.7 5.7s-2.56 5.7-5.7 5.7A5.71 5.71 0 0 1 1.3 8c0-3.14 2.56-5.7 5.7-5.7zM7 1C3.14 1 0 4.14 0 8s3.14 7 7 7 7-3.14 7-7-3.14-7-7-7zm1 3H6v5h2V4zm0 6H6v2h2v-2z"></path></svg></span>Browser Support</div><div class="admonitionContent_P8nc"><p>We support <strong>IE11</strong> & <strong>2 most recent versions of Edge, Chrome, Firefox & Safari</strong>. If you need older browser support, take a look at <a href="https://github.com/Financial-Times/polyfill-library" target="_blank" rel="noopener noreferrer">polyfill-library</a> that also uses <code>formatjs</code> but pre-bundle other polyfills that we use.</p></div></div>
<p>React Intl relies on these <code>Intl</code> APIs:</p>
<ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/NumberFormat" target="_blank" rel="noopener noreferrer">Intl.NumberFormat</a>: Available on IE11+</li>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DateTimeFormat" target="_blank" rel="noopener noreferrer">Intl.DateTimeFormat</a>: Available on IE11+</li>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/PluralRules" target="_blank" rel="noopener noreferrer">Intl.PluralRules</a>: This can be polyfilled using <a href="/docs/polyfills/intl-pluralrules">this package</a>.</li>
<li>(Optional) <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RelativeTimeFormat" target="_blank" rel="noopener noreferrer">Intl.RelativeTimeFormat</a>: Required if you use <a href="/docs/react-intl/api#formatrelativetime"><code>formatRelativeTime</code></a>
or <a href="/docs/react-intl/components#formattedrelativetime"><code>FormattedRelativeTime</code></a>. This can be polyfilled using <a href="/docs/polyfills/intl-relativetimeformat">this package</a>.</li>
<li>(Optional) <a href="https://tc39.es/proposal-intl-displaynames/" target="_blank" rel="noopener noreferrer">Intl.DisplayNames</a>: Required if you use <a href="/docs/react-intl/api#formatdisplayname"><code>formatDisplayName</code></a>
or <a href="/docs/react-intl/components#formatteddisplayname"><code>FormattedDisplayName</code></a>. This can be polyfilled using <a href="/docs/polyfills/intl-displaynames">this package</a>.</li>
</ul>
<p>We officially support IE11 along with 2 most recent versions of Edge, Chrome & Firefox.</p>
<h2 class="anchor anchorWithStickyNavbar_VKkZ" id="nodejs">Node.js<a href="#nodejs" class="hash-link" aria-label="Direct link to Node.js" title="Direct link to Node.js"></a></h2>
<h3 class="anchor anchorWithStickyNavbar_VKkZ" id="full-icu">full-icu<a href="#full-icu" class="hash-link" aria-label="Direct link to full-icu" title="Direct link to full-icu"></a></h3>
<p>Starting with Node.js 13.0.0 full-icu is supported by default.</p>
<p>If using React Intl in an earlier version of Node.js, your <code>node</code> binary has to either:</p>
<ul>
<li>Get compiled with <code>full-icu</code> using these <a href="https://nodejs.org/api/intl.html" target="_blank" rel="noopener noreferrer">instructions</a></li>
</ul>
<p><strong>OR</strong></p>
<ul>
<li>Uses <a href="https://www.npmjs.com/package/full-icu" target="_blank" rel="noopener noreferrer"><code>full-icu</code> npm package</a></li>
</ul>
<p>If your <code>node</code> version is missing any of the <code>Intl</code> APIs above, you'd have to polyfill them accordingly.</p>
<h2 class="anchor anchorWithStickyNavbar_VKkZ" id="react-native">React Native<a href="#react-native" class="hash-link" aria-label="Direct link to React Native" title="Direct link to React Native"></a></h2>
<p>If you're using <code>react-intl</code> in React Native, make sure your runtime has built-in <code>Intl</code> support (similar to <a href="https://github.com/react-native-community/jsc-android-buildscripts#international-variant" target="_blank" rel="noopener noreferrer">JSC International variant</a>). See these issues for more details:</p>
<ul>
<li><a href="https://github.com/formatjs/formatjs/issues/1356" target="_blank" rel="noopener noreferrer">https://github.com/formatjs/formatjs/issues/1356</a></li>
<li><a href="https://github.com/formatjs/formatjs/issues/992" target="_blank" rel="noopener noreferrer">https://github.com/formatjs/formatjs/issues/992</a></li>
</ul>
<h3 class="anchor anchorWithStickyNavbar_VKkZ" id="react-native-on-ios">React Native on iOS<a href="#react-native-on-ios" class="hash-link" aria-label="Direct link to React Native on iOS" title="Direct link to React Native on iOS"></a></h3>
<p>If you cannot use the Intl variant of JSC (e.g on iOS), follow the instructions in <a href="/docs/polyfills">polyfills</a> to polyfill the following APIs (in this order):</p>
<ol>
<li><a href="/docs/polyfills/intl-getcanonicallocales">Intl.getCanonicalLocales</a></li>
<li><a href="/docs/polyfills/intl-locale">Intl.Locale</a></li>
<li><a href="/docs/polyfills/intl-pluralrules">Intl.PluralRules</a></li>
<li><a href="/docs/polyfills/intl-numberformat">Intl.NumberFormat</a></li>
<li><a href="/docs/polyfills/intl-datetimeformat">Intl.DateTimeFormat</a></li>
</ol></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/guides/runtime-requirements.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="2025-04-19T02:45:48.000Z" itemprop="dateModified">Apr 19, 2025</time></b> by <b>Long Ho</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/guides/distribute-libraries"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Distributing i18n-friendly libraries</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/guides/advanced-usage"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Advanced Usage</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="#browser" class="table-of-contents__link toc-highlight">Browser</a></li><li><a href="#nodejs" class="table-of-contents__link toc-highlight">Node.js</a><ul><li><a href="#full-icu" class="table-of-contents__link toc-highlight">full-icu</a></li></ul></li><li><a href="#react-native" class="table-of-contents__link toc-highlight">React Native</a><ul><li><a href="#react-native-on-ios" class="table-of-contents__link toc-highlight">React Native on iOS</a></li></ul></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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