![Eiji Kitamura](https://web.dev/images/authors/agektmr.jpg) Eiji Kitamura [X](https://twitter.com/agektmr) [GitHub](https://github.com/agektmr) [Mastodon](https://infosec.exchange/@agektmr) [Bluesky](https://bsky.app/profile/agektmr.com) ![Meggin Kearney](https://web.dev/images/authors/megginkearney.jpg) Meggin Kearney

<br />

Save Credentials from sign-in forms

Keep your registration and sign-in forms as simple as possible.

Save credentials from sign-in forms
so users won't have to sign in again when they return.

To store user credentials from forms:

1. Include `autocomplete` in the form.
2. Prevent the form from submitting.
3. Authenticate by sending a request.
4. Store the credential.
5. Update the UI or proceed to the personalized page.

## Include `autocomplete` in the form

Before moving forward,
check if your form includes `autocomplete` attributes.
This helps the Credential Management API find the `id` and `password`
from the form and construct a credential object.

This also helps browsers not supporting the Credential Management API
to understand its semantics.
Learn more about autofill in
[this article](https://cloudfour.com/thinks/autofill-what-web-devs-should-know-but-dont/) by
[Jason Grigsby](https://medium.com/@grigs).

    <form id="signup" method="post">
      <input name="email" type="text" autocomplete="username email" />
      <input name="display-name" type="text" autocomplete="name" />
      <input name="password" type="password" autocomplete="new-password" />
      <input type="submit" value="Sign Up!" />
    </form>

## Prevent the form from submitting

When the user presses the submit button, prevent the form from submitting, which would otherwise
result in a page transition:

        var f = document.querySelector('#signup');
        f.addEventListener('submit', e => {
          e.preventDefault();

By preventing a page transition,
you can retain the credential information while verifying its authenticity.

## Authenticate by sending a request

To authenticate the user, deliver credential information to your server using AJAX.

On the server side, create an endpoint (or simply alter an existing endpoint)
that responds with HTTP code 200 or 401, so that it's clear to the browser
whether the sign-up/sign-in/change password is successful or not.

For example:

    // Try sign-in with AJAX
    fetch('/signin', {
      method: 'POST',
      body: new FormData(e.target),
      credentials: 'include',
    });

## Store the credential

To store a credential, first check if the API is available,
then instantiate a
[`PasswordCredential`](https://developer.mozilla.org/docs/Web/API/PasswordCredential)
with the form element as an argument
either synchronously or asynchronously.
Call
[`navigator.credentials.store()`](https://developer.mozilla.org/docs/Web/API/CredentialsContainer/store).
If the API is not available,
you can simply forward the profile information to the next step.

Synchronous example:

    if (window.PasswordCredential) {
      var c = new PasswordCredential(e.target);
      return navigator.credentials.store(c);
    } else {
      return Promise.resolve(profile);
    }

Asynchronous example:

    if (window.PasswordCredential) {
      var c = await navigator.credentials.create({password: e.target});
      return navigator.credentials.store(c);
    } else {
      return Promise.resolve(profile);
    }

Once the request succeeds, store the credential information.
(Don't store the credentials information if the request failed
as doing so confuses returning users.)

When the Chrome browser obtains credential information,
a notification pops up asking to store a credential
(or federation provider).
![store credential](https://web.dev/static/articles/security-credential-management-save-forms/image/store-credential-f27fdeafeab5c.png) Notification for an auto signed-in user

## Update the UI

If everything went well, update the UI using the profile information,
or proceed to the personalized page.

         }).then(profile => {
           if (profile) {
             updateUI(profile);
           }
         }).catch(error => {
           showError('Sign-in Failed');
         });
        });

## Full code example

    // Get form's DOM object
    var f = document.querySelector('#signup');
    f.addEventListener('submit', (e) => {
      // Stop submitting form by itself
      e.preventDefault();

      // Try sign-in with AJAX
      fetch('/signin', {
        method: 'POST',
        body: new FormData(e.target),
        credentials: 'include',
      })
        .then((res) => {
          if (res.status == 200) {
            return Promise.resolve();
          } else {
            return Promise.reject('Sign-in failed');
          }
        })
        .then((profile) => {
          // Instantiate PasswordCredential with the form
          if (window.PasswordCredential) {
            var c = new PasswordCredential(e.target);
            return navigator.credentials.store(c);
          } else {
            return Promise.resolve(profile);
          }
        })
        .then((profile) => {
          // Successful sign-in
          if (profile) {
            updateUI(profile);
          }
        })
        .catch((error) => {
          // Sign-in failed
          showError('Sign-in Failed');
        });
    });

## Browser compatibility

### `PasswordCredential`


Browser Support

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- ![Safari: not supported.](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/PasswordCredential)

<br />

### `navigator.credentials.store()`


Browser Support

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- ![Firefox: 60.](data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 512 512'%3E%3Cdefs%3E%3CradialGradient id='ff-b' cx='428.5' cy='55.1' r='501' gradientUnits='userSpaceOnUse'%3E%3Cstop offset='.1' stop-color='%23ffbd4f'/%3E%3Cstop offset='.2' stop-color='%23ffac31'/%3E%3Cstop offset='.3' stop-color='%23ff9d17'/%3E%3Cstop offset='.3' stop-color='%23ff980e'/%3E%3Cstop offset='.4' stop-color='%23ff563b'/%3E%3Cstop offset='.5' stop-color='%23ff3750'/%3E%3Cstop offset='.7' stop-color='%23f5156c'/%3E%3Cstop offset='.8' stop-color='%23eb0878'/%3E%3Cstop offset='.9' stop-color='%23e50080'/%3E%3C/radialGradient%3E%3CradialGradient id='ff-c' cx='245.4' cy='259.9' r='501' gradientUnits='userSpaceOnUse'%3E%3Cstop offset='.3' stop-color='%23960e18'/%3E%3Cstop offset='.3' stop-color='%23b11927' stop-opacity='.7'/%3E%3Cstop offset='.4' stop-color='%23db293d' stop-opacity='.3'/%3E%3Cstop offset='.5' stop-color='%23f5334b' stop-opacity='.1'/%3E%3Cstop 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[Source](https://developer.mozilla.org/docs/Web/API/CredentialsContainer/store)

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