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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.
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Starting with GraphQL will not only be better for your schema, but it will also be better and crucial for you and your team when building maintainable front-end systems. To start building your GraphQL API and building a truly resilient schema, you should almost certainly consult Production Ready GraphQL, and a worthy companion tutorial; Designing a GraphQL API.
Testing React components isn't as hard as it's made to be, especially with modern-day tools such as React Testing Library, and Jest, which take out all the guesswork of rendering and interacting with a component. Jest will act as the test runner and provide the overall structure of your unit tests, while React Testing Library will provide the methods needed to accurately assert functionality.
Jest uses a package called Istanbul to provide test coverage metrics such as statement, branch, function, and line coverage so that you can understand and enforce the quality of your test suite, providing more confidence in releases.