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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.
Store the token in a http cookie, so nobody can access it. The jwt will then be sent on each request to the backend, that will verify its integrity. If you want to store data in a more permanent way on the frontend, you might use DeepVault. It's a lib that encrypts your data in indexedDB. It's security through obfuscation so it's not completely secure, but it will mitigate most of automated attacks.
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Hence, a higher number means a more popular project.