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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
during development we use mirage JS to spin up an in-browser mock server which returns mock data for any API endpoints not currently implemented by the real backend. during integration testing we configure this server to return mock data for all API endpoints in the system, giving us a fixed environment against which our tests can run. test suites can be run in parallel since each time a playwright page is opened a new copy of the webapp, and thus a new copy of the mock server, is launched. these integration tests run whenever a frontend PR is opened or updated.