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GoogleAPIs give you programmatic access to Google Maps, Google Drive, YouTube, and many other Google products. To make coding against these APIs easier, Google provides client libraries that can reduce the amount of code you need to write and make your code more robust.

This document explains how to implement OAuth 2.0 authorization to access Google APIs from a JavaScript web application. OAuth 2.0 allows users to share specific data with an application while keeping their usernames, passwords, and other information private. For example, an application can use OAuth 2.0 to obtain permission fromusers to store files in their Google Drives.

This OAuth 2.0 flow is called the implicit grant flow. It is designed for applications that access APIs only while the user is present at the application. These applications are not able to store confidential information.

In this flow, your app opens a Google URL that uses query parameters to identify your app and the type of API access that the app requires. You can open the URL in the current browser window or a popup. The user can authenticate with Google and grant the requested permissions. Google then redirects the user back to your app. The redirect includes an access token, which your app verifies and then uses to make API requests.

If you use Google APIs client library for JavaScript to make authorized calls to Google, you should use Google Identity Services JavaScript library to handle the OAuth 2.0 flow. Please see Google identity Services' token model, which is based upon the OAuth 2.0 implicit grant flow.

Note: Given the security implications of getting the implementation correct, we strongly encourage you to use OAuth 2.0 libraries such as Google identity Services' token model when interacting with Google's OAuth 2.0 endpoints. It is a best practice to use well-debugged code provided by others, and it will help you protect yourself and your users.

Any application that uses OAuth 2.0 to access Google APIs must have authorization credentials that identify the application to Google's OAuth 2.0 server. The following steps explain how to create credentials for your project. Your applications can then use the credentials to access APIs that you have enabled for that project.

Scopes enable your application to only request access to the resources that it needs while also enabling users to control the amount of access that they grant to your application. Thus, there may be an inverse relationship between the number of scopes requested and the likelihood of obtaining user consent.

The following steps show how your application interacts with Google's OAuth 2.0 server to obtain a user's consent to perform an API request on the user's behalf. Your application must have that consent before it can execute a Google API request that requires user authorization.

Determines where the API server redirects the user after the user completes the authorization flow. The value must exactly match one of the authorized redirect URIs for the OAuth 2.0 client, which you configured in your client's API Console Credentials page. If this value doesn't match an authorized redirect URI for the provided client_id you will get a redirect_uri_mismatch error.

JavaScript applications need to set the parameter's value to token. This value instructs the Google Authorization Server to return the access token as a name=value pair in the fragment identifier of the URI (#) to which the user is redirected after completing the authorization process.

Scopes enable your application to only request access to the resources that it needs while also enabling users to control the amount of access that they grant to your application. Thus, there is an inverse relationship between the number of scopes requested and the likelihood of obtaining user consent.

We recommend that your application request access to authorization scopes in context whenever possible. By requesting access to user data in context, via incremental authorization, you help users to more easily understand why your application needs the access it is requesting.

Specifies any string value that your application uses to maintain state between your authorization request and the authorization server's response. The server returns the exact value that you send as a name=value pair in the URL fragment identifier (#) of the redirect_uri after the user consents to or denies your application's access request.

You can use this parameter for several purposes, such as directing the user to the correct resource in your application, sending nonces, and mitigating cross-site request forgery. Since your redirect_uri can be guessed, using a state value can increase your assurance that an incoming connection is the result of an authentication request. If you generate a random string or encode the hash of a cookie or another value that captures the client's state, you can validate the response to additionally ensure that the request and response originated in the same browser, providing protection against attacks such as cross-site request forgery. See the OpenID Connect documentation for an example of how to create and confirm a state token.

Enables applications to use incremental authorization to request access to additional scopes in context. If you set this parameter's value to true and the authorization request is granted, then the new access token will also cover any scopes to which the user previously granted the application access. See the incremental authorization section for examples.

Defaults to true. If set to false, more granular Google Account permissions will be disabled for OAuth client IDs created before 2019. No effect for newer OAuth client IDs, since more granular permissions is always enabled for them.

If your application knows which user is trying to authenticate, it can use this parameter to provide a hint to the Google Authentication Server. The server uses the hint to simplify the login flow either by prefilling the email field in the sign-in form or by selecting the appropriate multi-login session.

A space-delimited, case-sensitive list of prompts to present the user. If you don't specify this parameter, the user will be prompted only the first time your project requests access. See Prompting re-consent for more information. Possible values are:

The following JavaScript snippet shows how to initiate the authorization flow in JavaScript without using the Google APIs Client Library for JavaScript. Since this OAuth 2.0 endpoint does not support Cross-Origin Resource Sharing (CORS), the snippet creates a form that opens the request to that endpoint.

In this step, the user decides whether to grant your application the requested access. At this stage, Google displays a consent window that shows the name of your application and the Google API services that it is requesting permission to access with the user's authorization credentials and a summary of the scopes of access to be granted. The user can then consent to grant access to one or more scopes requested by your application or refuse the request.

Your application doesn't need to do anything at this stage as it waits for the response from Google's OAuth 2.0 server indicating whether any access was granted. That response is explained in the following step.

Requests to Google's OAuth 2.0 authorization endpoint may display user-facing error messages instead of the expected authentication and authorization flows. Common error codes and suggested resolutions are listed below.

The Google Account is unable to authorize one or more scopes requested due to the policies of their Google Workspace administrator. See the Google Workspace Admin help article Control which third-party & internal apps access Google Workspace data for more information about how an administrator may restrict access to all scopes or sensitive and restricted scopes until access is explicitly granted to your OAuth client ID.

Android developers may encounter this error message when opening authorization requests in android.webkit.WebView. Developers should instead use Android libraries such as Google Sign-In for Android or OpenID Foundation's AppAuth for Android.

Web developers may encounter this error when an Android app opens a general web link in an embedded user-agent and a user navigates to Google's OAuth 2.0 authorization endpoint from your site. Developers should allow general links to open in the default link handler of the operating system, which includes both Android App Links handlers or the default browser app. The Android Custom Tabs library is also a supported option.

iOS and macOS developers may encounter this error when opening authorization requests in WKWebView. Developers should instead use iOS libraries such as Google Sign-In for iOS or OpenID Foundation's AppAuth for iOS.

Web developers may encounter this error when an iOS or macOS app opens a general web link in an embedded user-agent and a user navigates to Google's OAuth 2.0 authorization endpoint from your site. Developers should allow general links to open in the default link handler of the operating system, which includes both Universal Links handlers or the default browser app. The SFSafariViewController library is also a supported option.

The OAuth client ID in the request is part of a project limiting access to Google Accounts in a specific Google Cloud Organization. For more information about this configuration option see the User type section in the Setting up your OAuth consent screen help article.

When using incremental authorization, the token may have expired or has been invalidated. Authenticate the user again and ask for user consent to obtain new tokens. If you are continuing to see this error, ensure that your application has been configured correctly and that you are using the correct tokens and parameters in your request. Otherwise, the user account may have been deleted or disabled.

The scheme, domain, and/or port of the JavaScript originating the authorization request may not match an authorized JavaScript origin URI registered for the OAuth client ID. Review authorized JavaScript origins in the Google API Console Credentials page.

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