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Authentication

Expo can be used to login to many popular providers on iOS, Android, and web! Most of these guides utilize the pure JS AuthSession API, refer to those docs for more information on the API.

Here are some important rules that apply to all authentication providers:

  • Use WebBrowser.maybeCompleteAuthSession() to dismiss the web popup. If you forget to add this then the popup window will not close.
  • Create redirects with AuthSession.makeRedirectUri() this does a lot of the heavy lifting involved with universal platform support. Behind the scenes it uses expo-linking.
  • Build requests using AuthSession.useAuthRequest(), the hook allows for async setup which means mobile browsers won't block the authentication.
  • Be sure to disable the prompt until request is defined.
  • You can only invoke promptAsync in a user-interaction on web.

Guides

AuthSession can be used for any OAuth or OpenID Connect provider, we've assembled guides for using the most requested services! If you'd like to see more, you can open a PR or vote on canny.

IdentityServer 4

IdentityServer 4

OAuth 2 | OpenID

Azure

Azure

OAuth 2 | OpenID

Apple

Apple

iOS Only

Cognito

Cognito

OAuth 2 | OpenID

Coinbase

Coinbase

OAuth 2

Dropbox

Dropbox

OAuth 2

Facebook

Facebook

OAuth 2

Fitbit

Fitbit

OAuth 2

Firebase Phone

Firebase Phone

Recaptcha

GitHub

GitHub

OAuth 2

Google

Google

OAuth 2 | OpenID

Imgur

Imgur

OAuth 2

Okta

Okta

OAuth 2 | OpenID

Reddit

Reddit

OAuth 2

Slack

Slack

OAuth 2

Spotify

Spotify

OAuth 2

Strava

Strava

OAuth 2

Twitch

Twitch

OAuth 2

Twitter

Twitter

OAuth 2

Uber

Uber

OAuth 2

IdentityServer 4

IdentityServer 4

WebsiteProviderPKCEAuto Discovery
More InfoOpenIDRequiredAvailable
  • If offline_access isn't included then no refresh token will be returned.
IdentityServer 4 Example
import * as React from 'react';
import { Button, Text, View } from 'react-native';
import * as AuthSession from 'expo-auth-session';
import * as WebBrowser from 'expo-web-browser';

WebBrowser.maybeCompleteAuthSession();
const useProxy = true;
const redirectUri = AuthSession.makeRedirectUri({
  useProxy,
});

export default function App() {
  const discovery = AuthSession.useAutoDiscovery('https://demo.identityserver.io');
  // Create and load an auth request
  const [request, result, promptAsync] = AuthSession.useAuthRequest(
    {
      clientId: 'native.code',
      redirectUri,
      scopes: ['openid', 'profile', 'email', 'offline_access'],
    },
    discovery
  );

  return (
    <View style={{ flex: 1, justifyContent: 'center', alignItems: 'center' }}>
      <Button title="Login!" disabled={!request} onPress={() => promptAsync({ useProxy })} />
      {result && <Text>{JSON.stringify(result, null, 2)}</Text>}
    </View>
  );
}
Azure

Azure

Create Azure App
WebsiteProviderPKCEAuto Discovery
Get Your ConfigOpenIDSupportedAvailable
Azure Example
import * as React from 'react';
import * as WebBrowser from 'expo-web-browser';
import { makeRedirectUri, useAuthRequest, useAutoDiscovery } from 'expo-auth-session';
import { Button } from 'react-native';

WebBrowser.maybeCompleteAuthSession();

export default function App() {
  // Endpoint
  const discovery = useAutoDiscovery('https://login.microsoftonline.com/<TENANT_ID>/v2.0');
  // Request
  const [request, response, promptAsync] = useAuthRequest(
    {
      clientId: 'CLIENT_ID',
      scopes: ['openid', 'profile', 'email', 'offline_access'],
      redirectUri: makeRedirectUri({
        scheme: 'your.app'
      }),
    },
    discovery
  );

  return (
    <Button
      disabled={!request}
      title="Login"
      onPress={() => {
        promptAsync();
      }}
    />
  );
}
Cognito

Cognito

Create Cognito App
WebsiteProviderPKCEAuto Discovery
Get Your ConfigOpenIDSupportedNot Available
  • Leverages the Hosted UI in Cognito (API documentation)
  • Requests code after successfully authenticating, followed by exchanging code for the auth tokens (PKCE)
  • The /token endpoint requires a code_verifier parameter which you can retrieve from the request before calling exchangeCodeAsync():
extraParams: {
  code_verifier: request.codeVerifier,
}

import * as React from 'react';
import * as WebBrowser from 'expo-web-browser';
import { useAuthRequest, exchangeCodeAsync, revokeAsync, ResponseType } from 'expo-auth-session';
import { Button, Alert } from 'react-native';

WebBrowser.maybeCompleteAuthSession();

const clientId = '<your-client-id-here>';
const userPoolUrl =
  'https://<your-user-pool-domain>.auth.<your-region>.amazoncognito.com';
const redirectUri = 'your-redirect-uri';

export default function App() {
  const [authTokens, setAuthTokens] = React.useState(null);
  const discoveryDocument = React.useMemo(() => ({
    authorizationEndpoint: userPoolUrl + '/oauth2/authorize',
    tokenEndpoint: userPoolUrl + '/oauth2/token',
    revocationEndpoint: userPoolUrl + '/oauth2/revoke',
  }), []);

  const [request, response, promptAsync] = useAuthRequest(
    {
      clientId,
      responseType: ResponseType.Code,
      redirectUri,
      usePKCE: true,
    },
    discoveryDocument
  );

  React.useEffect(() => {
    const exchangeFn = async (exchangeTokenReq) => {
      try {
        const exchangeTokenResponse = await exchangeCodeAsync(
          exchangeTokenReq,
          discoveryDocument
        );
        setAuthTokens(exchangeTokenResponse);
      } catch (error) {
        console.error(error);
      }
    };
    if (response) {
      if (response.error) {
        Alert.alert(
          'Authentication error',
          response.params.error_description || 'something went wrong'
        );
        return;
      }
      if (response.type === 'success') {
        exchangeFn({
          clientId,
          code: response.params.code,
          redirectUri,
          extraParams: {
            code_verifier: request.codeVerifier,
          },
        });
      }
    }
  }, [discoveryDocument, request, response]);

  const logout = async () => {
    const revokeResponse = await revokeAsync(
      {
        clientId: clientId,
        token: authTokens.refreshToken,
      },
      discoveryDocument
    );
    if (revokeResponse) {
      setAuthTokens(null);
    }
  };
  console.log('authTokens: ' + JSON.stringify(authTokens));
  return authTokens ? (
    <Button title="Logout" onPress={() => logout()} />
  ) : (
    <Button disabled={!request} title="Login" onPress={() => promptAsync()} />
  );
}
Coinbase

Coinbase

Create Coinbase App
WebsiteProviderPKCEAuto Discovery
Get Your ConfigOAuth 2.0SupportedNot Available
  • The redirectUri requires 2 slashes (://).
  • Scopes must be joined with ':' so just create one long string.
  • Setup redirect URIs: Your Project > Permitted Redirect URIs: (be sure to save after making changes).
    • Expo Go: exp://localhost:19000/--/
    • Web dev: https://localhost:19006
      • Run expo start --web --https to run with https, auth won't work otherwise.
      • Adding a slash to the end of the URL doesn't matter.
    • Standalone and Bare: your-scheme://
      • Scheme should be specified in app.json expo.scheme: 'your-scheme', then added to the app code with makeRedirectUri({ native: 'your-scheme://' }))
    • Proxy: Not Supported
      • You cannot use the Expo proxy (useProxy) because they don't allow @ in their redirect URIs.
    • Web production: https://yourwebsite.com
      • Set this to whatever your deployed website URL is.
import {
  exchangeCodeAsync,
  makeRedirectUri,
  TokenResponse,
  useAuthRequest,
} from "expo-auth-session";
import * as WebBrowser from "expo-web-browser";
import * as React from "react";
import { Button } from "react-native";

WebBrowser.maybeCompleteAuthSession();

// Endpoint
const discovery = {
  authorizationEndpoint: "https://www.coinbase.com/oauth/authorize",
  tokenEndpoint: "https://api.coinbase.com/oauth/token",
  revocationEndpoint: "https://api.coinbase.com/oauth/revoke",
};

const redirectUri = makeRedirectUri({ scheme: 'your.app'});
const CLIENT_ID = "CLIENT_ID";

export default function App() {
  const [request, response, promptAsync] = useAuthRequest(
    {
      clientId: CLIENT_ID,
      scopes: ["wallet:accounts:read"],
      redirectUri,
    },
    discovery
  );
  const {
    // The token will be auto exchanged after auth completes.
    token,
    exchangeError,
  } = useAutoExchange(
    response?.type === "success" ? response.params.code : null
  );

  React.useEffect(() => {
    if (token) {
      console.log("My Token:", token.accessToken);
    }
  }, [token]);

  return (
    <Button
      disabled={!request}
      title="Login"
      onPress={() => {
        promptAsync();
      }}
    />
  );
}

type State = {
  token: TokenResponse | null;
  exchangeError: Error | null;
};

// A hook to automatically exchange the auth token for an access token.
// this should be performed in a server and not here in the application.
// For educational purposes only:
function useAutoExchange(code?: string): State {
  const [state, setState] = React.useReducer(
    (state: State, action: Partial<State>) => ({ ...state, ...action }),
    { token: null, exchangeError: null }
  );
  const isMounted = useMounted();

  React.useEffect(() => {
    if (!code) {
      setState({ token: null, exchangeError: null });
      return;
    }

    exchangeCodeAsync(
      {
        clientId: CLIENT_ID,
        clientSecret: "CLIENT_SECRET",
        code,
        redirectUri,
      },
      discovery
    )
      .then((token) => {
        if (isMounted.current) {
          setState({ token, exchangeError: null });
        }
      })
      .catch((exchangeError) => {
        if (isMounted.current) {
          setState({ exchangeError, token: null });
        }
      });
  }, [code]);

  return state;
}

function useMounted() {
  const isMounted = React.useRef(true);
  React.useEffect(() => {
    return () => {
      isMounted.current = false;
    };
  }, []);
  return isMounted;
}
  • Coinbase does not support implicit grant.
Dropbox

Dropbox

Create Dropbox App
WebsiteProviderPKCEAuto Discovery
Get Your ConfigOAuth 2.0Not SupportedNot Available
  • Scopes must be an empty array.
  • PKCE must be disabled (usePKCE: false) otherwise you'll get an error about code_challenge being included in the query string.
  • Implicit auth is supported.
  • When responseType: ResponseType.Code is used (default behavior) the redirectUri must be https. This means that code exchange auth cannot be done on native without useProxy enabled.

Auth code responses (ResponseType.Code) will only work in native with useProxy: true.

import * as React from 'react';
import * as WebBrowser from 'expo-web-browser';
import { makeRedirectUri, useAuthRequest } from 'expo-auth-session';
import { Button, Platform } from 'react-native';

WebBrowser.maybeCompleteAuthSession();

// Endpoint
const discovery = {
  authorizationEndpoint: 'https://www.dropbox.com/oauth2/authorize',
  tokenEndpoint: 'https://www.dropbox.com/oauth2/token',
};

const useProxy = Platform.select({ web: false, default: true });

export default function App() {
  const [request, response, promptAsync] = useAuthRequest(
    {
      clientId: 'CLIENT_ID',
      // There are no scopes so just pass an empty array
      scopes: [],
      // Dropbox doesn't support PKCE
      usePKCE: false,
      // For usage in managed apps using the proxy
      redirectUri: makeRedirectUri({
        scheme: 'your.app',
        useProxy,
      }),
    },
    discovery
  );

  React.useEffect(() => {
    if (response?.type === 'success') {
      const { code } = response.params;
    }
  }, [response]);

  return (
    <Button
      disabled={!request}
      title="Login"
      onPress={() => {
        promptAsync({ useProxy });
      }}
    />
  );
}

import * as React from 'react';
import * as WebBrowser from 'expo-web-browser';
import { makeRedirectUri, ResponseType, useAuthRequest } from 'expo-auth-session';
import { Button } from 'react-native';

WebBrowser.maybeCompleteAuthSession();

// Endpoint
const discovery = {
  authorizationEndpoint: 'https://www.dropbox.com/oauth2/authorize',
  tokenEndpoint: 'https://www.dropbox.com/oauth2/token',
};

export default function App() {
  const [request, response, promptAsync] = useAuthRequest(
    {
      responseType: ResponseType.Token,
      clientId: 'CLIENT_ID',
      // There are no scopes so just pass an empty array
      scopes: [],
      // Dropbox doesn't support PKCE
      usePKCE: false,
      redirectUri: makeRedirectUri({
        scheme: 'your.app'
      }),
    },
    discovery
  );

  React.useEffect(() => {
    if (response?.type === 'success') {
      const { access_token } = response.params;
    }
  }, [response]);

  return (
    <Button
      disabled={!request}
      title="Login"
      onPress={() => {
        promptAsync();
      }}
    />
  );
}
Fitbit

Fitbit

Create Fitbit App
WebsiteProviderPKCEAuto Discovery
Get Your ConfigOAuth 2.0SupportedNot Available
  • Provider only allows one redirect URI per app. You'll need an individual app for every method you want to use:
    • Expo Go: exp://localhost:19000/--/*
    • Expo Go + Proxy: https://auth.expo.io/@you/your-app
    • Standalone or Bare: com.your.app://*
    • Web: https://yourwebsite.com/*
  • The redirectUri requires 2 slashes (://).
import * as React from 'react';
import * as WebBrowser from 'expo-web-browser';
import { makeRedirectUri, useAuthRequest } from 'expo-auth-session';
import { Button, Platform } from 'react-native';

WebBrowser.maybeCompleteAuthSession();

// Endpoint
const discovery = {
  authorizationEndpoint: 'https://www.fitbit.com/oauth2/authorize',
  tokenEndpoint: 'https://api.fitbit.com/oauth2/token',
  revocationEndpoint: 'https://api.fitbit.com/oauth2/revoke',
};

export default function App() {
  const [request, response, promptAsync] = useAuthRequest(
    {
      clientId: 'CLIENT_ID',
      scopes: ['activity', 'sleep'],
      redirectUri: makeRedirectUri({
        scheme: 'your.app'
      }),
    },
    discovery
  );

  React.useEffect(() => {
    if (response?.type === 'success') {
      const { code } = response.params;
    }
  }, [response]);

  return (
    <Button
      disabled={!request}
      title="Login"
      onPress={() => {
        promptAsync();
      }}
    />
  );
}

import * as React from 'react';
import * as WebBrowser from 'expo-web-browser';
import { makeRedirectUri, ResponseType, useAuthRequest } from 'expo-auth-session';
import { Button, Platform } from 'react-native';

WebBrowser.maybeCompleteAuthSession();

const useProxy = Platform.select({ web: false, default: true });

// Endpoint
const discovery = {
  authorizationEndpoint: 'https://www.fitbit.com/oauth2/authorize',
  tokenEndpoint: 'https://api.fitbit.com/oauth2/token',
  revocationEndpoint: 'https://api.fitbit.com/oauth2/revoke',
};

export default function App() {
  const [request, response, promptAsync] = useAuthRequest(
    {
      responseType: ResponseType.Token,
      clientId: 'CLIENT_ID',
      scopes: ['activity', 'sleep'],
      // For usage in managed apps using the proxy
      redirectUri: makeRedirectUri({
        useProxy,
        scheme: 'your.app'
      }),
    },
    discovery
  );

  React.useEffect(() => {
    if (response?.type === 'success') {
      const { access_token } = response.params;
    }
  }, [response]);

  return (
    <Button
      disabled={!request}
      title="Login"
      onPress={() => {
        promptAsync({ useProxy });
      }}
    />
  );
}
GitHub

GitHub

Create GitHub App
WebsiteProviderPKCEAuto Discovery
Get Your ConfigOAuth 2.0SupportedNot Available
  • Provider only allows one redirect URI per app. You'll need an individual app for every method you want to use:
    • Expo Go: exp://localhost:19000/--/*
    • Expo Go + Proxy: https://auth.expo.io/@you/your-app
    • Standalone or Bare: com.your.app://*
    • Web: https://yourwebsite.com/*
  • The redirectUri requires 2 slashes (://).
  • revocationEndpoint is dynamic and requires your config.clientId.
import * as React from 'react';
import * as WebBrowser from 'expo-web-browser';
import { makeRedirectUri, useAuthRequest } from 'expo-auth-session';
import { Button } from 'react-native';

WebBrowser.maybeCompleteAuthSession();

// Endpoint
const discovery = {
  authorizationEndpoint: 'https://github.com/login/oauth/authorize',
  tokenEndpoint: 'https://github.com/login/oauth/access_token',
  revocationEndpoint: 'https://github.com/settings/connections/applications/<CLIENT_ID>',
};

export default function App() {
  const [request, response, promptAsync] = useAuthRequest(
    {
      clientId: 'CLIENT_ID',
      scopes: ['identity'],
      redirectUri: makeRedirectUri({
        scheme: 'your.app'
      }),
    },
    discovery
  );

  React.useEffect(() => {
    if (response?.type === 'success') {
      const { code } = response.params;
    }
  }, [response]);

  return (
    <Button
      disabled={!request}
      title="Login"
      onPress={() => {
        promptAsync();
      }}
    />
  );
}
Imgur

Imgur

Create Imgur App
WebsiteProviderPKCEAuto Discovery
Get Your ConfigOAuth 2.0SupportedNot Available
  • You will need to create a different provider app for each platform (dynamically choosing your clientId).
  • Learn more here: imgur.com/oauth2
import * as React from 'react';
import * as WebBrowser from 'expo-web-browser';
import { makeRedirectUri, useAuthRequest } from 'expo-auth-session';
import { Button, Platform } from 'react-native';

WebBrowser.maybeCompleteAuthSession();

const discovery = {
  authorizationEndpoint: 'https://api.imgur.com/oauth2/authorize',
  tokenEndpoint: 'https://api.imgur.com/oauth2/token',
};

export default function App() {
  // Request
  const [request, response, promptAsync] = useAuthRequest(
    {
      clientId: 'CLIENT_ID',
      clientSecret: 'CLIENT_SECRET',
      redirectUri: makeRedirectUri({
        scheme: 'your.app',
      }),
      // imgur requires an empty array
      scopes: [],
    },
    discovery
  );

  React.useEffect(() => {
    if (response?.type === 'success') {
      const { code } = response.params;
    }
  }, [response]);

  return (
    <Button
      disabled={!request}
      title="Login"
      onPress={() => {
        promptAsync();
      }}
    />
  );
}

import * as React from 'react';
import * as WebBrowser from 'expo-web-browser';
import { makeRedirectUri, ResponseType, useAuthRequest } from 'expo-auth-session';
import { Button, Platform } from 'react-native';

WebBrowser.maybeCompleteAuthSession();

const discovery = {
  authorizationEndpoint: 'https://api.imgur.com/oauth2/authorize',
  tokenEndpoint: 'https://api.imgur.com/oauth2/token',
};

export default function App() {
  // Request
  const [request, response, promptAsync] = useAuthRequest(
    {
      responseType: ResponseType.Token,
      clientId: 'CLIENT_ID',
      redirectUri: makeRedirectUri({
        scheme: 'your.app',
      }),
      scopes: [],
    },
    discovery
  );

  React.useEffect(() => {
    if (response?.type === 'success') {
      const { access_token } = response.params;
    }
  }, [response]);

  return (
    <Button
      disabled={!request}
      title="Login"
      onPress={() => {
        promptAsync();
      }}
    />
  );
}
Okta

Okta

Create Okta App
WebsiteProviderPKCEAuto Discovery
Sign-up > ApplicationsOpenIDSupportedAvailable
  • You cannot define a custom redirectUri, Okta will provide you with one.
  • You can use the Expo proxy to test this without a native rebuild, just be sure to configure the project as a website.
import * as React from 'react';
import * as WebBrowser from 'expo-web-browser';
import { makeRedirectUri, useAuthRequest, useAutoDiscovery } from 'expo-auth-session';
import { Button, Platform } from 'react-native';

WebBrowser.maybeCompleteAuthSession();

const useProxy = Platform.select({ web: false, default: true });

export default function App() {
  // Endpoint
  const discovery = useAutoDiscovery('https://<OKTA_DOMAIN>.com/oauth2/default');
  // Request
  const [request, response, promptAsync] = useAuthRequest(
    {
      clientId: 'CLIENT_ID',
      scopes: ['openid', 'profile'],
      // For usage in managed apps using the proxy
      redirectUri: makeRedirectUri({
        // For usage in bare and standalone
        native: 'com.okta.<OKTA_DOMAIN>:/callback',
        useProxy,
      }),
    },
    discovery
  );

  React.useEffect(() => {
    if (response?.type === 'success') {
      const { code } = response.params;
    }
  }, [response]);

  return (
    <Button
      disabled={!request}
      title="Login"
      onPress={() => {
        promptAsync({ useProxy });
      }}
    />
  );
}
Reddit

Reddit

Create Reddit App
WebsiteProviderPKCEAuto Discovery
Get Your ConfigOAuth 2.0SupportedNot Available
  • Provider only allows one redirect URI per app. You'll need an individual app for every method you want to use:
    • Expo Go: exp://localhost:19000/--/*
    • Expo Go + Proxy: https://auth.expo.io/@you/your-app
    • Standalone or Bare: com.your.app://*
    • Web: https://yourwebsite.com/*
  • The redirectUri requires 2 slashes (://).
import * as React from 'react';
import * as WebBrowser from 'expo-web-browser';
import { makeRedirectUri, useAuthRequest } from 'expo-auth-session';
import { Button } from 'react-native';

WebBrowser.maybeCompleteAuthSession();

// Endpoint
const discovery = {
  authorizationEndpoint: 'https://www.reddit.com/api/v1/authorize.compact',
  tokenEndpoint: 'https://www.reddit.com/api/v1/access_token',
};

export default function App() {
  const [request, response, promptAsync] = useAuthRequest(
    {
      clientId: 'CLIENT_ID',
      scopes: ['identity'],
      redirectUri: makeRedirectUri({
        // For usage in bare and standalone
        native: 'your.app://redirect',
      }),
    },
    discovery
  );

  React.useEffect(() => {
    if (response?.type === 'success') {
      const { code } = response.params;
    }
  }, [response]);

  return (
    <Button
      disabled={!request}
      title="Login"
      onPress={() => {
        promptAsync();
      }}
    />
  );
}
  • You must select the installed option for your app on Reddit to use implicit grant.
import * as React from 'react';
import * as WebBrowser from 'expo-web-browser';
import { makeRedirectUri, ResponseType, useAuthRequest } from 'expo-auth-session';
import { Button } from 'react-native';

WebBrowser.maybeCompleteAuthSession();

// Endpoint
const discovery = {
  authorizationEndpoint: 'https://www.reddit.com/api/v1/authorize.compact',
  tokenEndpoint: 'https://www.reddit.com/api/v1/access_token',
};

export default function App() {
  const [request, response, promptAsync] = useAuthRequest(
    {
      responseType: ResponseType.Token,
      clientId: 'CLIENT_ID',
      scopes: ['identity'],
      redirectUri: makeRedirectUri({
        scheme: 'your.app'
      }),
    },
    discovery
  );

  React.useEffect(() => {
    if (response?.type === 'success') {
      const { access_token } = response.params;
    }
  }, [response]);

  return (
    <Button
      disabled={!request}
      title="Login"
      onPress={() => {
        promptAsync();
      }}
    />
  );
}
Slack

Slack

Create Slack App
WebsiteProviderPKCEAuto Discovery
Get Your ConfigOAuth 2.0SupportedNot Available
  • The redirectUri requires 2 slashes (://).
  • redirectUri can be defined under the "OAuth & Permissions" section of the website.
  • clientId and clientSecret can be found in the "App Credentials" section.
  • Scopes must be joined with ':' so just create one long string.
  • Navigate to the "Scopes" section to enable scopes.
  • revocationEndpoint is not available.
import * as React from 'react';
import * as WebBrowser from 'expo-web-browser';
import { makeRedirectUri, useAuthRequest } from 'expo-auth-session';
import { Button } from 'react-native';

WebBrowser.maybeCompleteAuthSession();

// Endpoint
const discovery = {
  authorizationEndpoint: 'https://slack.com/oauth/authorize',
  tokenEndpoint: 'https://slack.com/api/oauth.access',
};

export default function App() {
  const [request, response, promptAsync] = useAuthRequest(
    {
      clientId: 'CLIENT_ID',
      scopes: ['emoji:read'],
      redirectUri: makeRedirectUri({
        scheme: 'your.app'
      }),
    },
    discovery
  );

  React.useEffect(() => {
    if (response?.type === 'success') {
      const { code } = response.params;
    }
  }, [response]);

  return (
    <Button
      disabled={!request}
      title="Login"
      onPress={() => {
        promptAsync();
      }}
    />
  );
}
  • Slack does not support implicit grant.
Spotify

Spotify

Create Spotify App
WebsiteProviderPKCEAuto Discovery
Get Your ConfigOAuth 2.0SupportedNot Available
  • Setup your redirect URIs: Your project > Edit Settings > Redirect URIs (be sure to save after making changes).
    • Expo Go: exp://localhost:19000/--/
    • Web dev: https://localhost:19006
      • Important: Ensure there's no slash at the end of the URL unless manually changed in the app code with makeRedirectUri({ path: '/' }).
      • Run expo start --web --https to run with https, auth won't work otherwise.
    • Custom app: your-scheme://
      • Scheme should be specified in app.json expo.scheme: 'your-scheme', then added to the app code with makeRedirectUri({ native: 'your-scheme://' }))
    • Proxy: https://auth.expo.io/@username/slug
      • If useProxy is enabled (native only), change username for your Expo username and slug for the slug in your app.json. Try not to change the slug for your app after using it for auth as this can lead to versioning issues.
    • Web production: https://yourwebsite.com
      • Set this to whatever your deployed website URL is.
  • For simpler authentication, use the Implicit Flow as it'll return an access_token without the need for a code exchange server request.
  • Learn more about the Spotify API.
import * as React from 'react';
import * as WebBrowser from 'expo-web-browser';
import { makeRedirectUri, useAuthRequest } from 'expo-auth-session';
import { Button } from 'react-native';

WebBrowser.maybeCompleteAuthSession();

// Endpoint
const discovery = {
  authorizationEndpoint: 'https://accounts.spotify.com/authorize',
  tokenEndpoint: 'https://accounts.spotify.com/api/token',
};

export default function App() {
  const [request, response, promptAsync] = useAuthRequest(
    {
      clientId: 'CLIENT_ID',
      scopes: ['user-read-email', 'playlist-modify-public'],
      // In order to follow the "Authorization Code Flow" to fetch token after authorizationEndpoint
      // this must be set to false
      usePKCE: false,
      redirectUri: makeRedirectUri({
        scheme: 'your.app'
      }),
    },
    discovery
  );

  React.useEffect(() => {
    if (response?.type === 'success') {
      const { code } = response.params;
    }
  }, [response]);

  return (
    <Button
      disabled={!request}
      title="Login"
      onPress={() => {
        promptAsync();
      }}
    />
  );
}

import * as React from 'react';
import * as WebBrowser from 'expo-web-browser';
import { makeRedirectUri, ResponseType, useAuthRequest } from 'expo-auth-session';
import { Button } from 'react-native';

WebBrowser.maybeCompleteAuthSession();

// Endpoint
const discovery = {
  authorizationEndpoint: 'https://accounts.spotify.com/authorize',
  tokenEndpoint: 'https://accounts.spotify.com/api/token',
};

export default function App() {
  const [request, response, promptAsync] = useAuthRequest(
    {
      responseType: ResponseType.Token,
      clientId: 'CLIENT_ID',
      scopes: ['user-read-email', 'playlist-modify-public'],
      // In order to follow the "Authorization Code Flow" to fetch token after authorizationEndpoint
      // this must be set to false
      usePKCE: false,
      redirectUri: makeRedirectUri({
        scheme: 'your.app'
      }),
    },
    discovery
  );

  React.useEffect(() => {
    if (response?.type === 'success') {
      const { access_token } = response.params;
    }
  }, [response]);

  return (
    <Button
      disabled={!request}
      title="Login"
      onPress={() => {
        promptAsync();
      }}
    />
  );
}
Strava

Strava

Create Strava App
WebsiteProviderPKCEAuto Discovery
Get Your ConfigOAuth 2.0SupportedNot Available
  • Learn more about the Strava API.
  • The "Authorization Callback Domain" refers to the final path component of your redirect URI. Ex: In the URI com.bacon.myapp://redirect the domain would be redirect.
  • No Implicit auth flow is provided by Strava.
import * as React from 'react';
import * as WebBrowser from 'expo-web-browser';
import { makeRedirectUri, useAuthRequest } from 'expo-auth-session';
import { Button } from 'react-native';

WebBrowser.maybeCompleteAuthSession();

// Endpoint
const discovery = {
  authorizationEndpoint: 'https://www.strava.com/oauth/mobile/authorize',
  tokenEndpoint: 'https://www.strava.com/oauth/token',
  revocationEndpoint: 'https://www.strava.com/oauth/deauthorize',
};

export default function App() {
  const [request, response, promptAsync] = useAuthRequest(
    {
      clientId: 'CLIENT_ID',
      scopes: ['activity:read_all'],
      redirectUri: makeRedirectUri({
        // For usage in bare and standalone
        // the "redirect" must match your "Authorization Callback Domain" in the Strava dev console.
        native: 'your.app://redirect',
      }),
    },
    discovery
  );

  React.useEffect(() => {
    if (response?.type === 'success') {
      const { code } = response.params;
    }
  }, [response]);

  return (
    <Button
      disabled={!request}
      title="Login"
      onPress={() => {
        promptAsync();
      }}
    />
  );
}

Strava doesn't provide an implicit auth flow, you should send the code to a server or serverless function to perform the access token exchange. For debugging purposes, you can perform the exchange client-side using the following method:

const { accessToken } = await AuthSession.exchangeCodeAsync(
  {
    clientId: request?.clientId,
    redirectUri,
    code: result.params.code,
    extraParams: {
      // You must use the extraParams variation of clientSecret.
      // Never store your client secret on the client.
      client_secret: 'CLIENT_SECRET',
    },
  },
  { tokenEndpoint: 'https://www.strava.com/oauth/token' }
);
Twitch

Twitch

Create Twitch App
WebsiteProviderPKCEAuto DiscoveryScopes
Get your ConfigOAuthSupportedNot AvailableInfo
  • You will need to enable 2FA on your Twitch account to create an application.
import * as React from 'react';
import * as WebBrowser from 'expo-web-browser';
import { makeRedirectUri, useAuthRequest } from 'expo-auth-session';
import { Button } from 'react-native';

WebBrowser.maybeCompleteAuthSession();

// Endpoint
const discovery = {
  authorizationEndpoint: 'https://id.twitch.tv/oauth2/authorize',
  tokenEndpoint: 'https://id.twitch.tv/oauth2/token',
  revocationEndpoint: 'https://id.twitch.tv/oauth2/revoke',
};

export default function App() {
  const [request, response, promptAsync] = useAuthRequest(
    {
      clientId: 'CLIENT_ID',
      redirectUri: makeRedirectUri({
        scheme: 'your.app'
      }),
      scopes: ['user:read:email', 'analytics:read:games'],
    },
    discovery
  );

  React.useEffect(() => {
    if (response?.type === 'success') {
      const { code } = response.params;
    }
  }, [response]);

  return (
    <Button
      disabled={!request}
      title="Login"
      onPress={() => {
        promptAsync();
      }}
    />
  );
}

import * as React from 'react';
import * as WebBrowser from 'expo-web-browser';
import { makeRedirectUri, ResponseType, useAuthRequest } from 'expo-auth-session';
import { Button } from 'react-native';

WebBrowser.maybeCompleteAuthSession();

// Endpoint
const discovery = {
  authorizationEndpoint: 'https://id.twitch.tv/oauth2/authorize',
  tokenEndpoint: 'https://id.twitch.tv/oauth2/token',
  revocationEndpoint: 'https://id.twitch.tv/oauth2/revoke',
};

export default function App() {
  const [request, response, promptAsync] = useAuthRequest(
    {
      responseType: ResponseType.Token,
      clientId: 'CLIENT_ID',
      redirectUri: makeRedirectUri({
        scheme: 'your.app'
      }),
      scopes: ['user:read:email', 'analytics:read:games'],
    },
    discovery
  );

  React.useEffect(() => {
    if (response?.type === 'success') {
      const { access_token } = response.params;
    }
  }, [response]);

  return (
    <Button
      disabled={!request}
      title="Login"
      onPress={() => {
        promptAsync();
      }}
    />
  );
}
Twitter

Twitter

Create Twitter App
WebsiteProviderPKCEAuto DiscoveryScopes
Get your ConfigOAuthSupportedNot AvailableInfo
  • You will need to be approved by Twitter support before you can use the Twitter v2 API.
  • Web does not appear to work, the Twitter authentication website appears to block the popup, causing the response of useAuthRequest to always be {type: 'dismiss'}.
  • Example redirects:
    • Expo Go + Proxy: https://auth.expo.io/@you/your-app
    • Standalone or Bare: com.your.app://
    • Web (dev expo start --https): https://localhost:19006 (no ending slash)
  • The redirectUri requires 2 slashes (://).

Expo Go

You must use the proxy service in the Expo Go app because exp://localhost:19000 cannot be added to your Twitter app as a redirect.

import * as React from 'react';
import * as WebBrowser from 'expo-web-browser';
import { makeRedirectUri, useAuthRequest } from 'expo-auth-session';
import { Button, Platform } from 'react-native';

const useProxy = Platform.select({ web: false, default: true });

WebBrowser.maybeCompleteAuthSession();

// Endpoint
const discovery = {
  authorizationEndpoint: "https://twitter.com/i/oauth2/authorize",
  tokenEndpoint: "https://twitter.com/i/oauth2/token",
  revocationEndpoint: "https://twitter.com/i/oauth2/revoke",
};

export default function App() {
  const [request, response, promptAsync] = useAuthRequest(
    {
      clientId: 'CLIENT_ID',
      redirectUri: makeRedirectUri({
        scheme: 'your.app',
        useProxy
      }),
      usePKCE: true,
      scopes: [
        "tweet.read",
      ],
    },
    discovery
  );

  React.useEffect(() => {
    if (response?.type === 'success') {
      const { code } = response.params;
    }
  }, [response]);

  return (
    <Button
      disabled={!request}
      title="Login"
      onPress={() => {
        promptAsync({ useProxy });
      }}
    />
  );
}
Uber

Uber

Create Uber App
WebsiteProviderPKCEAuto Discovery
Get Your ConfigOAuth 2.0SupportedNot Available
  • The redirectUri requires 2 slashes (://).
  • scopes can be difficult to get approved.
import * as React from 'react';
import * as WebBrowser from 'expo-web-browser';
import { makeRedirectUri, useAuthRequest } from 'expo-auth-session';
import { Button } from 'react-native';

WebBrowser.maybeCompleteAuthSession();

// Endpoint
const discovery = {
  authorizationEndpoint: 'https://login.uber.com/oauth/v2/authorize',
  tokenEndpoint: 'https://login.uber.com/oauth/v2/token',
  revocationEndpoint: 'https://login.uber.com/oauth/v2/revoke',
};

export default function App() {
  const [request, response, promptAsync] = useAuthRequest(
    {
      clientId: 'CLIENT_ID',
      scopes: ['profile', 'delivery'],
      redirectUri: makeRedirectUri({
        scheme: 'your.app'
      }),
    },
    discovery
  );

  React.useEffect(() => {
    if (response?.type === 'success') {
      const { code } = response.params;
    }
  }, [response]);

  return (
    <Button
      disabled={!request}
      title="Login"
      onPress={() => {
        promptAsync();
      }}
    />
  );
}

import * as React from 'react';
import * as WebBrowser from 'expo-web-browser';
import { makeRedirectUri, ResponseType, useAuthRequest } from 'expo-auth-session';
import { Button } from 'react-native';

WebBrowser.maybeCompleteAuthSession();

// Endpoint
const discovery = {
  authorizationEndpoint: 'https://login.uber.com/oauth/v2/authorize',
  tokenEndpoint: 'https://login.uber.com/oauth/v2/token',
  revocationEndpoint: 'https://login.uber.com/oauth/v2/revoke',
};

export default function App() {
  const [request, response, promptAsync] = useAuthRequest(
    {
      responseType: ResponseType.Token,
      clientId: 'CLIENT_ID',
      scopes: ['profile', 'delivery'],
      redirectUri: makeRedirectUri({
        scheme: 'your.app'
      }),
    },
    discovery
  );

  React.useEffect(() => {
    if (response?.type === 'success') {
      const { access_token } = response.params;
    }
  }, [response]);

  return (
    <Button
      disabled={!request}
      title="Login"
      onPress={() => {
        promptAsync();
      }}
    />
  );
}

Redirect URI patterns

Here are a few examples of some common redirect URI patterns you may end up using.

Standalone and Bare

yourscheme://path

In some cases there will be anywhere between 1 to 3 slashes (/).

  • Environment:

    • Bare workflow
      • npx expo prebuild
    • Standalone builds in the App or Play Store or testing locally
      • Android: eas build or npx expo run:android
      • iOS: eas build or npx expo run:ios

  • Create: Use AuthSession.makeRedirectUri({ native: '<YOUR_URI>' }) to select native when running in the correct environment.

    • your.app://redirect -> makeRedirectUri({ scheme: 'your.app', path: 'redirect' })
    • your.app:/// -> makeRedirectUri({ scheme: 'your.app', isTripleSlashed: true })
    • your.app:/authorize -> makeRedirectUri({ native: 'your.app:/authorize' })
    • your.app://auth?foo=bar -> makeRedirectUri({ scheme: 'your.app', path: 'auth', queryParams: { foo: 'bar' } })
    • exp://u.expo.dev/[project-id]?channel-name=[channel-name]&runtime-version=[runtime-version] -> makeRedirectUri()
    • This link can often be created automatically but we recommend you define the scheme property at least. The entire URL can be overridden in custom apps by passing the native property. Often this will be used for providers like Google or Okta which require you to use a custom native URI redirect. You can add, list, and open URI schemes using npx uri-scheme.
    • If you change the expo.scheme after ejecting then you'll need to use the expo apply command to apply the changes to your native project, then rebuild them (yarn ios, yarn android).

  • Usage: promptAsync({ redirectUri })

Improving User Experience

The "login flow" is an important thing to get right, in a lot of cases this is where the user will commit to using your app again. A bad experience can cause users to give up on your app before they've really gotten to use it.

Here are a few tips you can use to make authentication quick, easy, and secure for your users!

Warming the browser

On Android you can optionally warm up the web browser before it's used. This allows the browser app to pre-initialize itself in the background. Doing this can significantly speed up prompting the user for authentication.

import * as React from 'react';
import * as WebBrowser from 'expo-web-browser';

function App() {
  React.useEffect(() => {
    WebBrowser.warmUpAsync();

    return () => {
      WebBrowser.coolDownAsync();
    };
  }, []);

  // Do authentication ...
}

Implicit login

You should never store your client secret locally in your bundle because there's no secure way to do this. Luckily a lot of providers have an "Implicit flow" which enables you to request an access token without the client secret. By default expo-auth-session requests an exchange code as this is the most widely applicable login method.

Here is an example of logging into Spotify without using a client secret.

import * as React from 'react';
import * as WebBrowser from 'expo-web-browser';
import { makeRedirectUri, useAuthRequest, ResponseType } from 'expo-auth-session';

WebBrowser.maybeCompleteAuthSession();

// Endpoint
const discovery = {
  authorizationEndpoint: 'https://accounts.spotify.com/authorize',
};

function App() {
  const [request, response, promptAsync] = useAuthRequest(
    {
      responseType: ResponseType.Token,
      clientId: 'CLIENT_ID',
      scopes: ['user-read-email', 'playlist-modify-public'],
      redirectUri: makeRedirectUri({
        scheme: 'your.app'
      }),
    },
    discovery
  );

  React.useEffect(() => {
    if (response && response.type === 'success') {
      const token = response.params.access_token;
    }
  }, [response]);

  return <Button disabled={!request} onPress={() => promptAsync()} title="Login" />;
}

Storing data

On native platforms like iOS, and Android you can secure things like access tokens locally using a package called expo-secure-store (This is different to AsyncStorage which is not secure). This package provides native access to keychain services on iOS and encrypted SharedPreferences on Android. There is no web equivalent to this functionality.

You can store your authentication results and rehydrate them later to avoid having to prompt the user to login again.

import * as SecureStore from 'expo-secure-store';

const MY_SECURE_AUTH_STATE_KEY = 'MySecureAuthStateKey';

function App() {
  const [, response] = useAuthRequest({});

  React.useEffect(() => {
    if (response && response.type === 'success') {
      const auth = response.params;
      const storageValue = JSON.stringify(auth);

      if (Platform.OS !== 'web') {
        // Securely store the auth on your device
        SecureStore.setItemAsync(MY_SECURE_AUTH_STATE_KEY, storageValue);
      }
    }
  }, [response]);

  // More login code...
}