Add Survey into your page
Visual Survey Editor. It can create or edit the JSON object, that can be used later as survey definition for SurveyJS library. The editor can be freely used at survey.js/builder/ You will need a commercial license, if you want to integrate the SurveyJS Editor into your website(s). To allow your customers creating the survey themself and store/load the survey definition into/from your storage.
Web Site: dxsurvey.com
SurveyJS service allows you to store your survey results, in case you do not want to store the results in your own storage. It will require to set just one attribute to store the survey resutls in the SurveyJS service. The results can be downloaded manually or via web API. Service provides some basic analytics via website and via web API. You may optionally create/edit/delete surveys. SurveyJS may load the survey definition from dxsurvey.com by setting one attribute. You may optionally run survey on the SurveyJS service website. At the current moment the service is free of charge. It may change in the future.