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===== in Controller ====
 $validateArr = ['name' => 'required'];
$messageArr=[
              'name.required'=>'Client Name Field is Required.', 
        ];
ajax_validate_request($request, $validateArr,$messageArr);

===== in Helpers ====

function ajax_validate_request($request, $fieldsArr, $msgArr = [])
{
    $validator = \Validator::make(
        $request->all(),
        $fieldsArr,
        $msgArr
    );
    if ($validator->fails()) {
        $errMsg = '';
        // dd($validator->getMessageBag()->toArray() );
        foreach ($validator->getMessageBag()->toArray() as $key => $value) {
            $errMsg .= $value[0] . "\r\n";
        }
        echo json_encode(array(
            'success' => 'error',
            'errormsg' => $errMsg
        ));
        exit;
    }
    
}