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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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We can use the Zod library to validate environment variables. Zod is a powerful, fast and lightweight JavaScript library for validating and transforming data. It supports many data types, including strings, numbers, arrays, objects, and even custom data types.
These challenges are not limited to local, even while deploying to a remote environment like Vercel these env variables when not set will cause run time error but ideally this would have been better if are caught during build time itself.
T3 stack template handles this out of the box for you. Please do check that out. You can also handle client and server environment variables separately for fine grain control so that your server secrets doesn't expose to client.