Laravel login as a username

Laravel login as a username

I tried below function but it will throw the error invalid how to login with username instead of username

class TokenAuthController extends Controller
{
    public function authenticate(Request $request)
    {
        $credentials = $request->only('username', 'password');

        try {
            if (! $token = JWTAuth::attempt($credentials)) {
                return response()->json(['error' => 'invalid_credentials'], 401);
            }
        } catch (JWTException $e) {
            return response()->json(['error' => 'could_not_create_token'], 500);
        }

        // if no errors are encountered we can return a JWT
        return response()->json(compact('token'));
    }
}

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