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Implicit grant type is recommended to use to obtain access tokens  if your application (client) is a mobile application or a browser based app such as a JavaScript client.  Like in Authorization code Grant, implicit Grant type is also based in redirection flow but the redirection URI includes the access token in the URI fragment. Because of that, the client application is capable of interacting with the resource owner user agent to obtain the access token from the redirection URI which is sent from the authorization server.

The implicit grant type does not require client authentication, and relies on the presence of the resource owner and the registration of the redirection URI. The resource owner needs to authenticate with the authorization server to obtain the access token. Because the access token is encoded into the redirection URI, it may be exposed to the resource owner and other applications residing in the same device.

The diagram below depicts the flow of Implicit Grant.

  1. The client requests for the access token with the client ID and grant type with optional parameters.

  2. Since the resource owner authenticates directly with the authorization server, his/her credentials will not be shared with the client.

  3. The Authorization Server sends the Access token in URI fragment to the client.

  4. Client extract the token from the fragment and send the API request to the Resource Server with the access token.

With this grant, the refresh token will not be issued for the client as the client type is public. Also note that, the implicit grant does not include client authentication because it does not make use of client secret.

Invoking the Token API to generate tokens  

In his example we are using WSO2 Playground hosted as a web application to obtain the access token with implicit grant.

Before you begin,

The following instructions use the sample playground webapp. See Setting up the Sample Webapp and follow the steps to setup the sample webapp.

  1. Login to WSO2 API Manager Store and create an application as below.
  2. Go to production keys tab in the created application, Add http://localhost:8080/playground2/oauth2client as the callback URL,  select implicit from the Grant Types and click Generate Keys. 

  3. Go to playground app http://wso2is.local:8080/playground2/index.jsp and click import photos.

  4. Give the information in the table below and click Authorize.

    FieldSample Value
    Authorization Grant TypeAuthorization Code
    Client IdConsumer Key obtained for your application
    ScopeThe scope you have selected for you application
    Callback URLThe callback URL of your application
    Authorize Endpointhttps://localhost:9443/oauth2/authorize

  5. The playground application redirects to the login page. Enter you username and password and click Sign In.

  6. Click Approve to provide access to your information.

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