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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.
There are packages like dotenv that allow you to configure environment variables in files. You can configure them when you host a site using a platform like Heroku or Netlify.
Like many cryptographic standards, the JWT algorithms are not secret. You can paste a JWT into Auth0's JWT debugger and see the information inside. This is why you should keep JWTs, and all tokens you receive, secret. Rotate them often. Only send them over HTTPS.
Products like Google Cloud have the authentication, authorization, secret storage, and secret retrieval built into the system you use to deploy your code.