Keep passkeys consistent with credentials on your server with the Signal API | Identity

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href="https://developer.chrome.google.cn/docs/identity/webauthn-signal-api?hl=vi" /><title>Keep passkeys consistent with credentials on your server with the Signal API  |  Identity  |  Chrome for Developers</title> <meta property="og:title" content="Keep passkeys consistent with credentials on your server with the Signal API  |  Identity  |  Chrome for Developers"><meta name="description" content="The WebAuthn Signal API allows a relying party to signal the state of existing credentials to the passkey provider, so that the passkeys are consistent with credentials on the server."> <meta property="og:description" content="The WebAuthn Signal API allows a relying party to signal the state of existing credentials to the passkey provider, so that the passkeys are consistent with credentials on the server."><meta property="og:url" content="https://developer.chrome.com/docs/identity/webauthn-signal-api"><meta property="og:locale" content="en"><script type="application/ld+json"> { "@context": 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</li> <li role="presentation"> <a role="menuitem" lang="tr" >Türkçe</a> </li> <li role="presentation"> <a role="menuitem" lang="ru" >Русский</a> </li> <li role="presentation"> <a role="menuitem" lang="he" >עברית</a> </li> <li role="presentation"> <a role="menuitem" lang="ar" >العربيّة</a> </li> <li role="presentation"> <a role="menuitem" lang="fa" >فارسی</a> </li> <li role="presentation"> <a role="menuitem" lang="hi" >हिंदी</a> </li> <li role="presentation"> <a role="menuitem" lang="bn" >বাংলা</a> </li> <li role="presentation"> <a role="menuitem" lang="th" >ภาษาไทย</a> </li> <li role="presentation"> <a role="menuitem" lang="zh_cn" >中文 – 简体</a> </li> <li role="presentation"> <a role="menuitem" lang="zh_tw" >中文 – 繁體</a> </li> <li role="presentation"> <a role="menuitem" lang="ja" >日本語</a> </li> <li role="presentation"> <a role="menuitem" lang="ko" >한국어</a> </li> </ul> </devsite-language-selector> <devsite-user enable-profiles id="devsite-user"> <span class="button devsite-top-button" aria-hidden="true" visually-hidden>Sign in</span> </devsite-user> </div> </div> </div> <div class="devsite-collapsible-section devsite-header-no-lower-tabs "> <div class="devsite-header-background"> <div class="devsite-product-id-row" > <div class="devsite-product-description-row"> <ul class="devsite-breadcrumb-list" > <li class="devsite-breadcrumb-item "> <a href="https://developer.chrome.com/docs/identity" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Lower Header" data-value="1" track-type="globalNav" track-name="breadcrumb" track-metadata-position="1" track-metadata-eventdetail="Identity" > Identity </a> </li> </ul> </div> </div> </div> </div> </div> </devsite-header> <devsite-book-nav scrollbars hidden> <div class="devsite-book-nav-filter" hidden> <span class="filter-list-icon material-icons" aria-hidden="true"></span> <input type="text" placeholder="Filter" aria-label="Type to filter" role="searchbox"> <span 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class="devsite-nav-text" tooltip menu="Docs"> More </span> <span class="devsite-nav-icon material-icons" data-icon="forward" menu="Docs"> </span> </span> </li> </ul> </li> <li class="devsite-nav-item"> <a href="/new" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: New in Chrome" track-name="new in chrome" data-category="Site-Wide Custom Events" data-label="Responsive Tab: New in Chrome" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > New in Chrome </span> </a> </li> </ul> </div> <div class="devsite-mobile-nav-bottom"> <ul class="devsite-nav-list" menu="Docs" aria-label="Side menu" hidden> <li class="devsite-nav-item devsite-nav-heading"> <span class="devsite-nav-title" tooltip > <span class="devsite-nav-text" tooltip > Build with Chrome </span> </span> </li> <li class="devsite-nav-item"> <a href="/docs/web-platform" class="devsite-nav-title 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tooltip > Chromium </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/aurora" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Aurora" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Aurora </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/android" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Web on Android" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Web on Android </span> </a> </li> <li class="devsite-nav-item"> <a href="https://developer.chrome.com/origintrials/" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Origin trials" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Origin trials </span> </a> </li> <li class="devsite-nav-item"> <a href="/release-notes" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Release notes" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Release notes </span> </a> </li> <li class="devsite-nav-item devsite-nav-heading"> <span class="devsite-nav-title" tooltip > <span class="devsite-nav-text" tooltip > Productivity </span> </span> </li> <li class="devsite-nav-item"> <a href="/docs/devtools" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: DevTools" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > DevTools </span> </a> </li> <li class="devsite-nav-item"> <a 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data-category="Site-Wide Custom Events" data-label="Responsive Tab: Identity" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Identity </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/payments" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Payments" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Payments </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/privacy-security" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Privacy and security" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Privacy and security </span> </a> </li> <li class="devsite-nav-item devsite-nav-heading"> <span class="devsite-nav-title" tooltip > <span class="devsite-nav-text" tooltip > Resources </span> </span> </li> <li class="devsite-nav-item"> <a href="/docs" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: All documentation" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > All documentation </span> </a> </li> <li class="devsite-nav-item"> <a href="https://web.dev/baseline" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Baseline" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Baseline </span> </a> </li> <li class="devsite-nav-item"> <a href="https://web.dev" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: web.dev" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > web.dev </span> </a> </li> <li class="devsite-nav-item"> <a href="https://pagespeed.web.dev" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: PageSpeed Insights audit" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > PageSpeed Insights audit </span> </a> </li> </ul> </div> </div> </nav> </devsite-book-nav> <section id="gc-wrapper"> <main role="main" id="main-content" class="devsite-main-content" has-sidebar > <div class="devsite-sidebar"> <div class="devsite-sidebar-content"> <devsite-toc class="devsite-nav" role="navigation" aria-label="On this page" depth="2" scrollbars ></devsite-toc> <devsite-recommendations-sidebar class="nocontent devsite-nav"> </devsite-recommendations-sidebar> </div> </div> <devsite-content> <article class="devsite-article"> <div class="devsite-article-meta nocontent" role="navigation"> <ul class="devsite-breadcrumb-list" aria-label="Breadcrumb"> <li class="devsite-breadcrumb-item "> <a href="https://developer.chrome.com/" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Breadcrumbs" data-value="1" track-type="globalNav" track-name="breadcrumb" track-metadata-position="1" track-metadata-eventdetail="" > Home </a> </li> <li class="devsite-breadcrumb-item "> <div class="devsite-breadcrumb-guillemet material-icons" aria-hidden="true"></div> <a href="https://developer.chrome.com/docs" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Breadcrumbs" data-value="2" track-type="globalNav" track-name="breadcrumb" track-metadata-position="2" track-metadata-eventdetail="Docs" > Docs </a> </li> <li class="devsite-breadcrumb-item "> <div class="devsite-breadcrumb-guillemet material-icons" aria-hidden="true"></div> <a href="https://developer.chrome.com/docs/identity" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Breadcrumbs" data-value="3" track-type="globalNav" track-name="breadcrumb" track-metadata-position="3" track-metadata-eventdetail="Identity" > Identity </a> </li> </ul> <devsite-thumb-rating position="header"> </devsite-thumb-rating> </div> <h1 class="devsite-page-title" tabindex="-1"> Keep passkeys consistent with credentials on your server with the Signal API </h1> <devsite-feature-tooltip ack-key="AckCollectionsBookmarkTooltipDismiss" analytics-category="Site-Wide Custom Events" analytics-action-show="Callout Profile displayed" analytics-action-close="Callout Profile dismissed" analytics-label="Create Collection Callout" class="devsite-page-bookmark-tooltip nocontent" dismiss-button="true" id="devsite-collections-dropdown" dismiss-button-text="Dismiss" close-button-text="Got it"> <devsite-bookmark></devsite-bookmark> <span slot="popout-heading"> Stay organized with collections </span> <span slot="popout-contents"> Save and categorize content based on your preferences. </span> </devsite-feature-tooltip> <div class="devsite-page-title-meta"><devsite-view-release-notes></devsite-view-release-notes></div> <devsite-toc class="devsite-nav" depth="2" devsite-toc-embedded > </devsite-toc> <div class="devsite-article-body clearfix "> <p><style> .wd-authors { --avatar-size: 65px; display: flex; gap: 2em; } .wd-author { display: flex; flex-wrap: wrap; gap: 1em; line-height: calc(var(--avatar-size) / 2); } .wd-author img { border-radius: 50%; height: var(--avatar-size, 65px); width: var(--avatar-size, 65px); } .dcc-authors { --avatar-size: 65px; display: flex; gap: 2em; } .dcc-author { display: flex; flex-wrap: wrap; gap: 1em; line-height: calc(var(--avatar-size) / 2); } .dcc-author img { border-radius: 50%; height: var(--avatar-size, 65px); width: var(--avatar-size, 65px); } .dcc-author__links a { margin-inline-end: 6px; } .dcc-author__links a:last-of-type { margin-inline-end: 0; } </style> <div class="dcc-authors" translate="no"> <div class="dcc-author"> <img class="devsite-landing-row-item-icon" alt="Eiji Kitamura" src="https://web.dev/images/authors/agektmr.jpg" decoding="async" height="64" loading="lazy" width="64"> <div> <span> Eiji Kitamura </span> <div class="dcc-author__links"> <a href="https://twitter.com/agektmr" aria-label="Eiji Kitamura on X" rel="me"> <svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 300 271"> <title>X</title> <path fill="currentColor" d="m236 0h46l-101 115 118 156h-92.6l-72.5-94.8-83 94.8h-46l107-123-113-148h94.9l65.5 86.6zm-16.1 244h25.5l-165-218h-27.4z"></path> </svg></a> <a href="https://github.com/agektmr" aria-label="Eiji Kitamura on GitHub" rel="me"> <svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 32.6 31.8"> <title>GitHub</title> 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style="stroke:none;stroke-miterlimit:10;fill-rule:evenodd;"></path> </svg></a> <a href="https://bsky.app/profile/agektmr.com" aria-label="Eiji Kitamura on Bluesky" rel="me"> <svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 568 501"> <title>Bluesky</title> <path fill="currentColor" d="M123.121 33.664C188.241 82.553 258.281 181.68 284 234.873c25.719-53.192 95.759-152.32 160.879-201.21C491.866-1.611 568-28.906 568 57.947c0 17.346-9.945 145.713-15.778 166.555-20.275 72.453-94.155 90.933-159.875 79.748C507.222 323.8 536.444 388.56 473.333 453.32c-119.86 122.992-172.272-30.859-185.702-70.281-2.462-7.227-3.614-10.608-3.631-7.733-.017-2.875-1.169.506-3.631 7.733-13.43 39.422-65.842 193.273-185.702 70.281-63.111-64.76-33.89-129.52 80.986-149.071-65.72 11.185-139.6-7.295-159.875-79.748C9.945 203.659 0 75.291 0 57.946 0-28.906 76.135-1.612 123.121 33.664Z"/> </svg> </a> </div> </div> </div> </div></p> <p> <p class="wd-pubdates" style="font-size: 90%; border-bottom: 1px solid var(--devsite-ref-palette--grey200);color: var(--devsite-ref-palette--blue-grey700)"> Published: November 12, 2024, Last updated: November 29, 2024 </p> </p> <p><a href="https://w3c.github.io/webauthn/#sctn-signal-methods">The WebAuthn Signal API</a> allows relying parties to signal existing credentials to connected passkey providers. With this, a supporting passkey provider can update or remove incorrect or revoked passkeys from its storage so they are no longer offered to users.</p> <h2 id="compatibility" data-text="Compatibility" tabindex="-1">Compatibility</h2> <p>Chrome on desktop supports Signal API starting from Chrome 132. Google Password Manager can update passkeys reflecting the signal. For Chrome extension based passkey providers, it's up to them whether they will reflect the signal or not.</p> <p>Chrome on Android support is coming later.</p> <p><a href="https://github.com/WebKit/standards-positions/issues/400">Safari is supportive</a> but not implemented yet. <a href="https://github.com/mozilla/standards-positions/issues/1075">Firefox hasn't shared their opinions</a> yet.</p> <h2 id="background" data-text="Background" tabindex="-1">Background</h2> <p>When a passkey (<a href="https://web.dev/articles/webauthn-discoverable-credentials">a discoverable credential</a>) is created, metadata such as a username and a display name are saved to the passkey provider (such as a password manager) along with the private key, while the public key credential is saved to the relying party's (RP's) server. Saving the username and display name helps the user to identify which of the offered passkeys to sign in with when prompted. This is especially useful when they have more than two passkeys from different passkey providers.</p> <p>However, there are a couple of cases where inconsistencies between the passkey provider's passkey list and the server's credentials list can lead to confusion.</p> <p>The first case is when a user deletes a credential on the server leaving the passkey in the passkey provider untouched. The next time the user tries to sign in with a passkey, that passkey will still be presented to the user by the passkey provider. However, the attempt to sign in will fail because the server won't be able to verify with the public key which was deleted.</p> <p>The second case is when a user updates their username or the display name on the server. The next time the user tries to sign in, the passkey in the passkey provider continues to display the old username and display name despite it's updated on the server. Ideally they should be in sync.</p> <h2 id="signal_api" data-text="Signal API" tabindex="-1">Signal API</h2> <p>The Signal API is a WebAuthn API that resolves these confusions by allowing RPs to signal changes to the passkey provider. There are three methods:</p> <ul> <li><a href="#signal-that-a-credential-does-not-exist"><code translate="no" dir="ltr">PublicKeyCredential.signalUnknownCredential</code></a>: Signal that a credential does not exist</li> <li><a href="#signal-a-list-of-saved-credentials"><code translate="no" dir="ltr">PublicKeyCredential.signalAllAcceptedCredentials</code></a>: Signal a list of saved credentials</li> <li><a href="#signal-updated-username-and-display-name"><code translate="no" dir="ltr">PublicKeyCredential.signalCurrentUserDetails</code></a>: Signal updated username and/or display name</li> </ul> <h3 id="signal-that-a-credential-does-not-exist" data-text="Signal that a credential does not exist" tabindex="-1">Signal that a credential does not exist</h3> <div></div><devsite-code><pre class="devsite-click-to-copy" translate="no" dir="ltr" is-upgraded syntax="JavaScript"><code translate="no" dir="ltr"><span class="devsite-syntax-kd">const</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nx">credential</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-k">await</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nx">navigator</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-nx">credentials</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-nx">get</span><span class="devsite-syntax-p">({</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">...</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">});</span> <span class="devsite-syntax-kd">const</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nx">payload</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nx">credential</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-nx">toJSON</span><span class="devsite-syntax-p">();</span> <span class="devsite-syntax-kd">const</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nx">result</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-k">await</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nx">fetch</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-s1">'/login'</span><span class="devsite-syntax-p">,</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">...</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">});</span> <span class="devsite-syntax-c1">// Detect authentication failure due to lack of the credential</span> <span class="devsite-syntax-k">if</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-nx">result</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-nx">status</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">===</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-mf">404</span><span class="devsite-syntax-p">)</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-c1">// Feature detection</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-k">if</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-nx">PublicKeyCredential</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-nx">signalUnknownCredential</span><span class="devsite-syntax-p">)</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-k">await</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nx">PublicKeyCredential</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-nx">signalUnknownCredential</span><span class="devsite-syntax-p">({</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-nx">rpId</span><span class="devsite-syntax-o">:</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-s2">"example.com"</span><span class="devsite-syntax-p">,</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-nx">credentialId</span><span class="devsite-syntax-o">:</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-s2">"vI0qOggiE3OT01ZRWBYz5l4MEgU0c7PmAA"</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-c1">// base64url encoded credential ID</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">});</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">}</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-k">else</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-c1">// Encourage the user to delete the passkey from the password manager nevertheless.</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">...</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">}</span> <span class="devsite-syntax-p">}</span> </code></pre></devsite-code> <p>By calling <code translate="no" dir="ltr">PublicKeyCredential.signalUnknownCredential()</code> with an RP ID and a credential ID, the RP can inform the passkey provider that the specified credential has been removed or does not exist. It's up to the passkey provider how to deal with this signal, but the associated passkey is expected to be removed so that the user won't sign in with a passkey as the associated credential does not exist.</p> <p> <div class="dcc-browser-compat" translate="no"> <p>Browser Support</p> <ul> <li data-support="yes"> <img alt="Chrome: 132." src="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='-10 -10 276 276'%3E%3ClinearGradient id='a' x1='145' x2='34' y1='253' y2='61' gradientUnits='userSpaceOnUse'%3E%3Cstop offset='0' stop-color='%231e8e3e'/%3E%3Cstop offset='1' stop-color='%2334a853'/%3E%3C/linearGradient%3E%3ClinearGradient id='b' x1='111' x2='222' y1='254' y2='62' gradientUnits='userSpaceOnUse'%3E%3Cstop offset='0' stop-color='%23fcc934'/%3E%3Cstop offset='1' stop-color='%23fbbc04'/%3E%3C/linearGradient%3E%3ClinearGradient id='c' x1='17' x2='239' y1='80' y2='80' gradientUnits='userSpaceOnUse'%3E%3Cstop offset='0' 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This way, the RP can prevent the user from attempting to sign in with a passkey that doesn't have an associated credential. Unlike <code translate="no" dir="ltr">signalAllAcceptedCredentials</code>, this method does not require passing the entire list of credential IDs, so it should be used whenever the user is not authenticated to avoid revealing the number of passkeys for a given user.</p> <figure class="screenshot"> <img src="/static/docs/identity/webauthn-signal-api/image/deleted-passkey.jpg" alt="A dialog displayed when a passkey is deleted from Google Password Manager on Chrome." srcset="https://developer.chrome.com/static/docs/identity/webauthn-signal-api/image/deleted-passkey_36.jpg 36w,https://developer.chrome.com/static/docs/identity/webauthn-signal-api/image/deleted-passkey_48.jpg 48w,https://developer.chrome.com/static/docs/identity/webauthn-signal-api/image/deleted-passkey_72.jpg 72w,https://developer.chrome.com/static/docs/identity/webauthn-signal-api/image/deleted-passkey_96.jpg 96w,https://developer.chrome.com/static/docs/identity/webauthn-signal-api/image/deleted-passkey_480.jpg 480w,https://developer.chrome.com/static/docs/identity/webauthn-signal-api/image/deleted-passkey_720.jpg 720w,https://developer.chrome.com/static/docs/identity/webauthn-signal-api/image/deleted-passkey_856.jpg 856w,https://developer.chrome.com/static/docs/identity/webauthn-signal-api/image/deleted-passkey_960.jpg 960w,https://developer.chrome.com/static/docs/identity/webauthn-signal-api/image/deleted-passkey_1440.jpg 1440w,https://developer.chrome.com/static/docs/identity/webauthn-signal-api/image/deleted-passkey_1920.jpg 1920w,https://developer.chrome.com/static/docs/identity/webauthn-signal-api/image/deleted-passkey_2880.jpg 2880w" sizes="(max-width: 840px) 100vw, 856px"> <figcaption>A dialog displayed when a passkey is deleted from Google Password Manager on Chrome.</figcaption> </figure> <h3 id="signal-a-list-of-saved-credentials" data-text="Signal a list of saved credentials" tabindex="-1">Signal a list of saved credentials</h3> <div></div><devsite-code><pre class="devsite-click-to-copy" translate="no" dir="ltr" is-upgraded syntax="JavaScript"><code translate="no" dir="ltr"><span class="devsite-syntax-c1">// After a user deletes a passkey or a user is signed in.</span> <span class="devsite-syntax-c1">// Feature detection</span> <span class="devsite-syntax-k">if</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-nx">PublicKeyCredential</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-nx">signalAllAcceptedCredentials</span><span class="devsite-syntax-p">)</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-k">await</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nx">PublicKeyCredential</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-nx">signalAllAcceptedCredentials</span><span class="devsite-syntax-p">({</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-nx">rpId</span><span class="devsite-syntax-o">:</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-s2">"example.com"</span><span class="devsite-syntax-p">,</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-nx">userId</span><span class="devsite-syntax-o">:</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-s2">"M2YPl-KGnA8"</span><span class="devsite-syntax-p">,</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-c1">// base64url encoded user ID</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-nx">allAcceptedCredentialIds</span><span class="devsite-syntax-o">:</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">[</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-c1">// A list of base64url encoded credential IDs</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-s2">"vI0qOggiE3OT01ZRWBYz5l4MEgU0c7PmAA"</span><span class="devsite-syntax-p">,</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">...</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">]</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">});</span> <span class="devsite-syntax-p">}</span> </code></pre></devsite-code> <p>By calling <code translate="no" dir="ltr">PublicKeyCredential.signalAllAcceptedCredentials()</code> with an RP ID, a user ID and a list of credential ID of stored credentials, the RP can inform the passkey provider of the remaining credentials in its storage. It's up to the passkey provider how to deal with this signal, but the passkeys that don't match this list are expected to be removed so that the user won't see passkeys on sign in for which the associated credential does not exist.</p> <p> <div class="dcc-browser-compat" translate="no"> <p>Browser Support</p> <ul> <li data-support="yes"> <img alt="Chrome: 132." src="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='-10 -10 276 276'%3E%3ClinearGradient id='a' x1='145' x2='34' y1='253' y2='61' gradientUnits='userSpaceOnUse'%3E%3Cstop offset='0' stop-color='%231e8e3e'/%3E%3Cstop offset='1' stop-color='%2334a853'/%3E%3C/linearGradient%3E%3ClinearGradient id='b' x1='111' x2='222' y1='254' y2='62' gradientUnits='userSpaceOnUse'%3E%3Cstop offset='0' stop-color='%23fcc934'/%3E%3Cstop offset='1' stop-color='%23fbbc04'/%3E%3C/linearGradient%3E%3ClinearGradient id='c' x1='17' x2='239' y1='80' y2='80' gradientUnits='userSpaceOnUse'%3E%3Cstop offset='0' 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Use caution when invoking it, as omitting valid passkeys will prevent the user from signing in with them. For example, passing an empty list may remove all of the user's passkeys.<br> Some credential providers may support restoring the passkeys on a subsequent call to <code translate="no" dir="ltr">signalAllAcceptedCredentials</code> with the previously removed credential IDs.</span></aside> <h3 id="signal-updated-username-and-display-name" data-text="Signal updated username and display name" tabindex="-1">Signal updated username and display name</h3> <div></div><devsite-code><pre class="devsite-click-to-copy" translate="no" dir="ltr" is-upgraded syntax="JavaScript"><code translate="no" dir="ltr"><span class="devsite-syntax-c1">// After a user updated their username and/or display name</span> <span class="devsite-syntax-c1">// or a user is signed in.</span> <span class="devsite-syntax-c1">// Feature detection</span> <span class="devsite-syntax-k">if</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-nx">PublicKeyCredential</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-nx">signalCurrentUserDetails</span><span class="devsite-syntax-p">)</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-k">await</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nx">PublicKeyCredential</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-nx">signalCurrentUserDetails</span><span class="devsite-syntax-p">({</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-nx">rpId</span><span class="devsite-syntax-o">:</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-s2">"example.com"</span><span class="devsite-syntax-p">,</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-nx">userId</span><span class="devsite-syntax-o">:</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-s2">"M2YPl-KGnA8"</span><span class="devsite-syntax-p">,</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-c1">// base64url encoded user ID</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-nx">name</span><span class="devsite-syntax-o">:</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-s2">"a.new.email.address@example.com"</span><span class="devsite-syntax-p">,</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-c1">// username</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-nx">displayName</span><span class="devsite-syntax-o">:</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-s2">"J. Doe"</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">});</span> <span class="devsite-syntax-p">}</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-k">else</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-p">}</span> </code></pre></devsite-code> <p>By calling <code translate="no" dir="ltr">PublicKeyCredential.signalCurrentUserDetails()</code> with an RP ID, a user ID, a username and a display name, the RP can inform the passkey provider of the updated user information. 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<figcaption>A dialog displayed when a passkey metadata is updated in Google Password Manager on Chrome.</figcaption> </figure> <aside class="special"><strong>Important:</strong><span> If a user edits their username or display name in Google Password Manager, this will be respected. Even if a user changes their username or display name on the RP, that change will not be reflected in Google Password Manager.</span></aside> <h2 id="summary" data-text="Summary" tabindex="-1">Summary</h2> <p>The Signal API helps you build a better passkey experience by eliminating chances of unexpected sign-in failure. With Signal API, relying parties can signal the list of existing credentials and their metadata, so they can keep passkeys on the passkey provider in-sync.</p> <p>To learn more about passkeys, start from <a href="https://goo.gle/passkeys">Passwordless login with passkeys</a>.</p> </div> <devsite-thumb-rating position="footer"> </devsite-thumb-rating> <div class="devsite-floating-action-buttons"> </div> </article> <devsite-content-footer class="nocontent"> <p>Except as otherwise noted, the content of this page is licensed under the <a href="https://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution 4.0 License</a>, and code samples are licensed under the <a href="https://www.apache.org/licenses/LICENSE-2.0">Apache 2.0 License</a>. For details, see the <a href="https://developers.google.com/site-policies">Google Developers Site Policies</a>. 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