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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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" 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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 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fill="currentColor" d="M 15.659 9.592 C 15.424 10.72 13.553 11.956 11.404 12.195 C 10.283 12.32 9.18 12.434 8.003 12.384 C 6.079 12.302 4.56 11.956 4.56 11.956 C 4.56 12.13 4.572 12.297 4.595 12.452 C 4.845 14.224 6.478 14.33 8.025 14.379 C 9.586 14.429 10.976 14.02 10.976 14.02 L 11.04 15.337 C 11.04 15.337 9.948 15.884 8.003 15.984 C 6.93 16.039 5.598 15.959 4.047 15.576 C 0.683 14.746 0.104 11.4 0.015 8.006 C -0.012 6.998 0.005 6.048 0.005 5.253 C 0.005 1.782 2.443 0.765 2.443 0.765 C 3.672 0.238 5.782 0.017 7.975 0 L 8.029 0 C 10.221 0.017 12.332 0.238 13.561 0.765 C 13.561 0.765 15.999 1.782 15.999 5.253 C 15.999 5.253 16.03 7.814 15.659 9.592 Z M 13.124 5.522 L 13.124 9.725 L 11.339 9.725 L 11.339 5.646 C 11.339 4.786 10.951 4.35 10.175 4.35 C 9.317 4.35 8.887 4.867 8.887 5.891 L 8.887 8.124 L 7.113 8.124 L 7.113 5.891 C 7.113 4.867 6.683 4.35 5.825 4.35 C 5.049 4.35 4.661 4.786 4.661 5.646 L 4.661 9.725 L 2.876 9.725 L 2.876 5.522 C 2.876 4.663 3.111 3.981 3.582 3.476 C 4.067 2.971 4.703 2.712 5.493 2.712 C 6.406 2.712 7.098 3.039 7.555 3.695 L 8 4.39 L 8.445 3.695 C 8.902 3.039 9.594 2.712 10.507 2.712 C 11.297 2.712 11.933 2.971 12.418 3.476 C 12.889 3.981 13.124 4.663 13.124 5.522 Z" style="stroke:none;stroke-miterlimit:10;fill-rule:evenodd;"></path> </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 </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> <pre class="prettyprint lang-javascript" translate="no" dir="ltr"><code translate="no" dir="ltr">const credential = await navigator.credentials.get({ ... }); const payload = credential.toJSON(); const result = await fetch('/login', { ... }); // Detect authentication failure due to lack of the credential if (result.status === 404) { // Feature detection if (PublicKeyCredential.signalUnknownCredential) { await PublicKeyCredential.signalUnknownCredential({ rpId: "example.com", credentialId: "vI0qOggiE3OT01ZRWBYz5l4MEgU0c7PmAA" // base64url encoded credential ID }); } else { // Encourage the user to delete the passkey from the password manager nevertheless. ... } } </code></pre> <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>This API can be invoked <strong>when a passkey based sign-in has failed due to an absence of a credential</strong>. 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> <pre class="prettyprint lang-javascript" translate="no" dir="ltr"><code translate="no" dir="ltr">// After a user deletes a passkey or a user is signed in. // Feature detection if (PublicKeyCredential.signalAllAcceptedCredentials) { await PublicKeyCredential.signalAllAcceptedCredentials({ rpId: "example.com", userId: "M2YPl-KGnA8", // base64url encoded user ID allAcceptedCredentialIds: [ // A list of base64url encoded credential IDs "vI0qOggiE3OT01ZRWBYz5l4MEgU0c7PmAA", ... ] }); } </code></pre> <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>This API should be invoked <strong>when a user deletes a passkey</strong> on the RP and on <strong>every sign-in</strong>, so that the passkey provider can keep a synchronized list of passkeys.</p> <aside class="warning"><strong>Warning:</strong><span> This API will remove passkeys that are not present on the list. 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> <pre class="prettyprint lang-javascript" translate="no" dir="ltr"><code translate="no" dir="ltr">// After a user updated their username and/or display name // or a user is signed in. // Feature detection if (PublicKeyCredential.signalCurrentUserDetails) { await PublicKeyCredential.signalCurrentUserDetails({ rpId: "example.com", userId: "M2YPl-KGnA8", // base64url encoded user ID name: "a.new.email.address@example.com", // username displayName: "J. Doe" }); } else { } </code></pre> <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. It's up to the passkey provider how to deal with this signal, but the passkeys the user owns are expected to be updated with the new user information.</p> <p>This API can be invoked <strong>when the user's username or display name are updated</strong>, and on <strong>every sign in</strong>, so that the passkey provider can keep this information synchronized with the server.</p> <figure class="screenshot"> <img src="/static/docs/identity/webauthn-signal-api/image/updated-passkey.jpg" alt="A dialog displayed when a passkey metadata is updated in Google Password Manager on Chrome." srcset="https://developer.chrome.com/static/docs/identity/webauthn-signal-api/image/updated-passkey_36.jpg 36w,https://developer.chrome.com/static/docs/identity/webauthn-signal-api/image/updated-passkey_48.jpg 48w,https://developer.chrome.com/static/docs/identity/webauthn-signal-api/image/updated-passkey_72.jpg 72w,https://developer.chrome.com/static/docs/identity/webauthn-signal-api/image/updated-passkey_96.jpg 96w,https://developer.chrome.com/static/docs/identity/webauthn-signal-api/image/updated-passkey_480.jpg 480w,https://developer.chrome.com/static/docs/identity/webauthn-signal-api/image/updated-passkey_720.jpg 720w,https://developer.chrome.com/static/docs/identity/webauthn-signal-api/image/updated-passkey_856.jpg 856w,https://developer.chrome.com/static/docs/identity/webauthn-signal-api/image/updated-passkey_960.jpg 960w,https://developer.chrome.com/static/docs/identity/webauthn-signal-api/image/updated-passkey_1440.jpg 1440w,https://developer.chrome.com/static/docs/identity/webauthn-signal-api/image/updated-passkey_1920.jpg 1920w,https://developer.chrome.com/static/docs/identity/webauthn-signal-api/image/updated-passkey_2880.jpg 2880w" sizes="(max-width: 840px) 100vw, 856px"> <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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Keep passkeys consistent with credentials on your server with the Signal API | Identity | Chrome for Developers