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Published: November 12, 2024, Last updated: November 29, 2024

<br />

[The WebAuthn Signal API](https://w3c.github.io/webauthn/#sctn-signal-methods)
lets relying parties signal existing credentials to connected passkey
providers. This lets a supporting passkey provider update or remove
incorrect or revoked passkeys from its storage so users are no longer offered them.

## Compatibility

Chrome supports Signal API on all desktop platforms and Android.

[Safari is supportive](https://github.com/WebKit/standards-positions/issues/400)
but not yet implemented. [Firefox hasn't yet shared its
opinion](https://github.com/mozilla/standards-positions/issues/1075).

Google Password Manager can update passkeys to reflect the signal. Chrome
extension-based passkey providers on desktop decide whether to reflect the
signal.

## Background

When a passkey ([a discoverable
credential](https://web.dev/articles/webauthn-discoverable-credentials)) 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 users identify which offered passkeys to use for
sign-in when prompted. This is especially useful when users have more than two
passkeys from different passkey providers.

However, there are a few cases where inconsistencies between the passkey
provider's passkey list and the server's credentials list can cause confusion.

The first case is when a user deletes a credential on the server. This leaves the
passkey in the passkey provider untouched. The next time the user tries to sign
in with a passkey, the passkey provider still presents that passkey to the user.
However, the attempt to sign in will fail because the server cannot verify the
public key that was deleted.

The second case is when a user updates their username or 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 even though it's
updated on the server. Ideally, these are synchronized.

## Signal API

The Signal API is a WebAuthn API that resolves these inconsistencies by
letting RPs signal changes to the passkey provider. There are three methods:

- [`PublicKeyCredential.signalUnknownCredential`](https://developer.chrome.com/docs/identity/webauthn-signal-api#signal-that-a-credential-does-not-exist): Signal that a credential does not exist
- [`PublicKeyCredential.signalAllAcceptedCredentials`](https://developer.chrome.com/docs/identity/webauthn-signal-api#signal-a-list-of-saved-credentials): Signal a list of saved credentials
- [`PublicKeyCredential.signalCurrentUserDetails`](https://developer.chrome.com/docs/identity/webauthn-signal-api#signal-updated-username-and-display-name): Signal updated username and display name

### Signal that a credential does not exist

    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.
        ...
      }
    }

By calling `PublicKeyCredential.signalUnknownCredential()` 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. The passkey provider determines how to handle this signal,
but the associated passkey should be removed so that users don't try to sign in
with a passkey that lacks an associated credential.


Browser Support

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- ![Safari: 26.](data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' xmlns:xlink='http://www.w3.org/1999/xlink' width='24' height='24' viewBox='195 190 135 135'%3E%3Cdefs%3E%3ClinearGradient id='s-a' x1='132.6' x2='134.4' y1='111.7' y2='-105.3' xlink:href='%23s-b'%3E%3Cstop offset='0' stop-color='%23d2d2d2' /%3E%3Cstop offset='.5' stop-color='%23f2f2f2' /%3E%3Cstop offset='1' stop-color='%23fff' /%3E%3C/linearGradient%3E%3ClinearGradient id='s-b' gradientUnits='userSpaceOnUse' /%3E%3ClinearGradient id='s-c' x1='65.4' x2='67.4' y1='115.7' y2='17.1' xlink:href='%23s-b'%3E%3Cstop offset='0' stop-color='%23005ad5' /%3E%3Cstop offset='.2' stop-color='%230875f0' /%3E%3Cstop offset='.3' stop-color='%23218cee' /%3E%3Cstop offset='.6' stop-color='%2327a5f3' /%3E%3Cstop offset='.8' stop-color='%2325aaf2' /%3E%3Cstop offset='1' stop-color='%2321aaef' /%3E%3C/linearGradient%3E%3ClinearGradient id='s-d' x1='158.7' x2='176.3' y1='96.7' y2='79.5' xlink:href='%23s-b'%3E%3Cstop offset='0' stop-color='%23c72e24' /%3E%3Cstop offset='1' stop-color='%23fd3b2f' /%3E%3C/linearGradient%3E%3CradialGradient id='s-i' cx='-69.9' cy='69.3' r='54' gradientTransform='matrix(.9 -.01 .04 2.72 -9 -120)' xlink:href='%23s-b'%3E%3Cstop offset='0' stop-color='%2324a5f3' stop-opacity='0' /%3E%3Cstop offset='1' stop-color='%231e8ceb' /%3E%3C/radialGradient%3E%3CradialGradient id='s-j' cx='109.3' cy='13.8' r='93.1' gradientTransform='matrix(-.02 1.1 -1.04 -.02 137 -115)' xlink:href='%23s-b'%3E%3Cstop offset='0' stop-opacity='0' /%3E%3Cstop offset='1' stop-color='%235488d6' stop-opacity='0' /%3E%3Cstop offset='1' stop-color='%235d96eb' /%3E%3C/radialGradient%3E%3C/defs%3E%3Crect width='220' height='220' x='22' y='-107' fill='url(%23s-a)' ry='49' transform='matrix(.57 0 0 .57 187 256)' /%3E%3Cg transform='translate(194 190)'%3E%3Ccircle cx='67.8' cy='67.7' fill='url(%23s-c)' paint-order='stroke fill markers' r='54' /%3E%3Ccircle cx='-69.9' cy='69.3' fill='url(%23s-i)' transform='translate(138 -2)' r='54' /%3E%3C/g%3E%3Cellipse cx='120' cy='14.2' fill='url(%23s-j)' rx='93.1' ry='93.7' transform='matrix(.58 0 0 .58 192 250)' /%3E%3Cg transform='matrix(.58 0 0 .57 197 182)'%3E%3Cpath fill='%23cac7c8' d='M46 192h1l72-48-7-9-66 57Z' /%3E%3Cpath fill='%23fbfffc' d='M46 191v1l66-57-7-9-59 65Z' /%3E%3Cpath fill='url(%23s-d)' d='m119 144-7-9 66-57-59 66Z' /%3E%3Cpath fill='%23fb645c' d='m105 126 7 9 66-57-1-1-72 49Z' /%3E%3C/g%3E%3Cpath stroke='%23fff' stroke-linecap='round' stroke-miterlimit='1' stroke-width='1.3' d='m287 278 3-2m-12-17 8-2m-8-3h4m-4-13 8 2m-8 3h4m-1-13 7 3m-4-11 7 4m-2-11 6 6m0-12 6 7m1-11 4 6m4-10 3 7m5-9 2 7m15-7-1 7m10-5-3 7m11-4-4 7m11-2-5 6m16 7-7 4m10 4-7 3m10 6-8 1m8 16-8-2m5 10-7-3m4 11-7-4m2 11-6-5m0 11-5-6m-2 11-4-7m-4 11-3-8m-6 10-1-8m-16 8 2-8m-10 5 3-7m-11 4 4-7m-11 2 5-6m-8 3 3-3m4 8 2-3m5 8 2-4m6 7 1-4m8 5v-4m8 4v-4m9 3-1-4m9 1-2-4m9 0-2-4m9-2-3-3m8-4-3-2m8-5-4-2m7-6-4-1m5-8h-4m4-8h-4m3-9-4 1m1-9-4 2m-1-9-3 2m-2-9-3 3m-4-8-2 3m-5-8-2 4m-6-6-1 3m-8-5v4m-8-4v4m-9-2 1 3m-9 0 2 3m-9 1 2 3m-9 2 3 3m-8 4 3 2m-8 5 4 2m-7 6 4 1m-4 25 4-1m-2 5 7-3m-6 7 4-2m-2 6 7-4m-13-21h8m41-41v-8m0 99v-8m49-42h-8' transform='translate(-65 8)' /%3E%3C/svg%3E)

[Source](https://developer.mozilla.org/docs/Web/API/PublicKeyCredential/signalUnknownCredential_static)

<br />

This API can be invoked **when a passkey-based sign-in has failed because a credential is absent** .
This way, the RP can prevent users from attempting to sign in with a passkey that
doesn't have an associated credential. Unlike
`signalAllAcceptedCredentials`, this method does not require you to pass the entire
list of credential IDs, so use it whenever the user is not authenticated to avoid
revealing the number of passkeys for a given user.
![A dialog displayed when a passkey is deleted from Google Password Manager on Chrome.](https://developer.chrome.com/static/docs/identity/webauthn-signal-api/image/deleted-passkey.jpg) A dialog displayed when a passkey is deleted from Google Password Manager on Chrome.

### Signal a list of saved credentials

    // 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",
          ...
        ]
      });
    }

Use `PublicKeyCredential.signalAllAcceptedCredentials()` after a user signs in
or manages account settings. You provide a list of all valid credential
IDs for that user. The passkey provider compares this list against its local
storage for that relying party. The passkey provider marks as "hidden" any passkey found in its storage that is not included in the `allAcceptedCredentialIds` list.
The system no longer offers these hidden passkeys for sign-in or autofill, but they are not immediately deleted permanently, which allows for restoration if necessary.
Conversely, the passkey provider restores passkeys present in `allAcceptedCredentialIds` that are marked as "hidden".
This lets your website restore passkeys that were hidden in error.


Browser Support

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- ![Safari: 26.](data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' xmlns:xlink='http://www.w3.org/1999/xlink' width='24' height='24' viewBox='195 190 135 135'%3E%3Cdefs%3E%3ClinearGradient id='s-a' x1='132.6' x2='134.4' y1='111.7' y2='-105.3' xlink:href='%23s-b'%3E%3Cstop offset='0' stop-color='%23d2d2d2' /%3E%3Cstop offset='.5' stop-color='%23f2f2f2' /%3E%3Cstop offset='1' stop-color='%23fff' /%3E%3C/linearGradient%3E%3ClinearGradient id='s-b' gradientUnits='userSpaceOnUse' /%3E%3ClinearGradient id='s-c' x1='65.4' x2='67.4' y1='115.7' y2='17.1' xlink:href='%23s-b'%3E%3Cstop offset='0' stop-color='%23005ad5' /%3E%3Cstop offset='.2' stop-color='%230875f0' /%3E%3Cstop offset='.3' stop-color='%23218cee' /%3E%3Cstop offset='.6' stop-color='%2327a5f3' /%3E%3Cstop offset='.8' stop-color='%2325aaf2' /%3E%3Cstop offset='1' stop-color='%2321aaef' /%3E%3C/linearGradient%3E%3ClinearGradient id='s-d' x1='158.7' x2='176.3' y1='96.7' y2='79.5' xlink:href='%23s-b'%3E%3Cstop offset='0' stop-color='%23c72e24' /%3E%3Cstop offset='1' stop-color='%23fd3b2f' /%3E%3C/linearGradient%3E%3CradialGradient id='s-i' cx='-69.9' cy='69.3' r='54' gradientTransform='matrix(.9 -.01 .04 2.72 -9 -120)' xlink:href='%23s-b'%3E%3Cstop offset='0' stop-color='%2324a5f3' stop-opacity='0' /%3E%3Cstop offset='1' stop-color='%231e8ceb' /%3E%3C/radialGradient%3E%3CradialGradient id='s-j' cx='109.3' cy='13.8' r='93.1' gradientTransform='matrix(-.02 1.1 -1.04 -.02 137 -115)' xlink:href='%23s-b'%3E%3Cstop offset='0' stop-opacity='0' /%3E%3Cstop offset='1' stop-color='%235488d6' stop-opacity='0' /%3E%3Cstop offset='1' stop-color='%235d96eb' /%3E%3C/radialGradient%3E%3C/defs%3E%3Crect width='220' height='220' x='22' y='-107' fill='url(%23s-a)' ry='49' transform='matrix(.57 0 0 .57 187 256)' /%3E%3Cg transform='translate(194 190)'%3E%3Ccircle cx='67.8' cy='67.7' fill='url(%23s-c)' paint-order='stroke fill markers' r='54' /%3E%3Ccircle cx='-69.9' cy='69.3' fill='url(%23s-i)' transform='translate(138 -2)' r='54' /%3E%3C/g%3E%3Cellipse cx='120' cy='14.2' fill='url(%23s-j)' rx='93.1' ry='93.7' transform='matrix(.58 0 0 .58 192 250)' /%3E%3Cg transform='matrix(.58 0 0 .57 197 182)'%3E%3Cpath fill='%23cac7c8' d='M46 192h1l72-48-7-9-66 57Z' /%3E%3Cpath fill='%23fbfffc' d='M46 191v1l66-57-7-9-59 65Z' /%3E%3Cpath fill='url(%23s-d)' d='m119 144-7-9 66-57-59 66Z' /%3E%3Cpath fill='%23fb645c' d='m105 126 7 9 66-57-1-1-72 49Z' /%3E%3C/g%3E%3Cpath stroke='%23fff' stroke-linecap='round' stroke-miterlimit='1' stroke-width='1.3' d='m287 278 3-2m-12-17 8-2m-8-3h4m-4-13 8 2m-8 3h4m-1-13 7 3m-4-11 7 4m-2-11 6 6m0-12 6 7m1-11 4 6m4-10 3 7m5-9 2 7m15-7-1 7m10-5-3 7m11-4-4 7m11-2-5 6m16 7-7 4m10 4-7 3m10 6-8 1m8 16-8-2m5 10-7-3m4 11-7-4m2 11-6-5m0 11-5-6m-2 11-4-7m-4 11-3-8m-6 10-1-8m-16 8 2-8m-10 5 3-7m-11 4 4-7m-11 2 5-6m-8 3 3-3m4 8 2-3m5 8 2-4m6 7 1-4m8 5v-4m8 4v-4m9 3-1-4m9 1-2-4m9 0-2-4m9-2-3-3m8-4-3-2m8-5-4-2m7-6-4-1m5-8h-4m4-8h-4m3-9-4 1m1-9-4 2m-1-9-3 2m-2-9-3 3m-4-8-2 3m-5-8-2 4m-6-6-1 3m-8-5v4m-8-4v4m-9-2 1 3m-9 0 2 3m-9 1 2 3m-9 2 3 3m-8 4 3 2m-8 5 4 2m-7 6 4 1m-4 25 4-1m-2 5 7-3m-6 7 4-2m-2 6 7-4m-13-21h8m41-41v-8m0 99v-8m49-42h-8' transform='translate(-65 8)' /%3E%3C/svg%3E)

[Source](https://developer.mozilla.org/docs/Web/API/PublicKeyCredential/signalAllAcceptedCredentials_static)

<br />

Invoke this API **when a user deletes a passkey** on the RP and on
**every sign-in**, so the passkey provider can maintain a synchronized list of
passkeys.

> [!WARNING]
> **Warning:** Use caution when invoking it, as omitting valid passkeys will prevent users from signing in with them. For example, passing an empty list can hide all of the user's passkeys. Some credential providers support restoring the passkeys on a subsequent call to `signalAllAcceptedCredentials` with the previously removed credential IDs. Read the explanation to understand the hiding and restoring of passkeys.

### Signal updated username and display name

    // 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 {
    }

By calling `PublicKeyCredential.signalCurrentUserDetails()` with an RP ID, a
user ID, a username and display name, the RP can inform the passkey provider
about the updated user information. The passkey provider determines how to handle this signal,
but it should update the passkeys the user owns with the new user information.


Browser Support

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[Source](https://developer.mozilla.org/docs/Web/API/PublicKeyCredential/signalCurrentUserDetails_static)

<br />

This API can be invoked **when the user's username or display name is
updated** , and on **every sign in**, so that the passkey provider can maintain
this information synchronized with the server.
![A dialog displayed when a passkey metadata is updated in Google Password Manager on Chrome.](https://developer.chrome.com/static/docs/identity/webauthn-signal-api/image/updated-passkey.jpg) A dialog displayed when a passkey metadata is updated in Google Password Manager on Chrome.

> [!IMPORTANT]
> **Important:** If a user edits their username or display name in Google Password Manager, the system respects this change. Even if a user changes their username or display name on the RP, Google Password Manager does not reflect that change.

## Summary

The Signal API helps you build a better passkey experience by eliminating
unexpected sign-in failures. The Signal API lets relying parties signal the list of existing credentials and their metadata, so they can keep passkeys on the passkey provider synchronized.

To learn more about passkeys, see [Passwordless login with
passkeys](https://goo.gle/passkeys).