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Directus
The Modern Data Stack π° β Directus is an instant REST+GraphQL API and intuitive no-code data collaboration app for any SQL database.
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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.
As it seems youβre only looking for an UI to your clients existing database, I would recommend Directus as it provides an auth. layer by default and sits directly above your already created tables. You can create field descriptions and placeholders inside of Directus and also get basic dashboard features out of the box.