Learn how to fix the Laravel Error unsupported_grant_type from our experts. Our Laravel Support team is here to help you with your questions and concerns.

Laravel Error unsupported_grant_type | Fixed

If you have been coming across the “unsupported_grant_type” error, our experts are here to help out.

According to our experts, this error usually occurs when there is an issue with the OAuth 2.0 authentication flow. In fact, this occurs when we try to request an access token with an unsupported grant type.

Here is an example of a token request using the “password” grant type in Laravel Passport:

curl -X POST http://oauth-server.com/oauth/token \
-H "Accept: application/json" \
-d "grant_type=password&client_id=client-id&client_secret=client-secret&username=user@example.com&password=user_password"

Here, we have to replace the placeholders with the actual values.

Let’s take a look at some of the common causes and fixes for the “unsupported_grant_type” error:

• • Incorrect Grant Type:

    Our experts recommends checking that we are using the correct grant type when requesting the access token. OAuth 2.0 defines different grant types like “authorization_code,” “password,” “client_credentials,” “refresh_token,” etc.
  • Misspelled Grant Type Parameter:

    Next, we must verify that the parameter name for the grant type is spelled correctly in the token request.
  • Missing or Extra Parameters:

    Then, we have to ensure that we include all the required parameters for the grant type we are using. In fact, missing or extra parameters can trigger the “unsupported_grant_type” error.
  • Compatibility:

    Furthermore, we have to check if the OAuth 2.0 server we are trying to interact with supports the grant type we are using.
  • Authorization Server Configuration:

    We have to check that the server’s configuration and settings support the grant type we are trying to use.

Furthermore, our experts recommend looking at the logs or error messages from the OAuth server for more information about the issue.

[Need assistance with a different issue? Our team is available 24/7.]

Conclusion

In summary, our Support Techs demonstrated how to resolve the Laravel Error unsupported_grant_type.