The JSON Web Token bearer grant is simply a JSON string containing claim values that will be evaluated and validated by the JWT Grant Handlers at the Authorization Server end before issuing an access token.
WSO2 Identity Server as an OAuth 2.0 Authorization Server can accept JSON Web Token(JWT) Assertions from OAuth 2.0 clients as a means of resource owner authentication and authorization. Additionally, it can exchange it with OAuth 2.0 access tokens in order to access protected resources on behalf of the resource owner.
To get started with the grant type, see Configuring JWT Grant Type for information and configuration steps. To download the grant type, go to https://store.wso2.com/store/assets/isconnector/jwtgrant.