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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.
This post goes through how to build a PKCE client for browser using TypeScript based applications with no dependencies. If you want to know more about what PKCE (Proof Key Code Exchange) is you can read my previous post, What Is PKCE. Before I start on how do to this, as a general rule I would use a client side library provided by a reputable authentication vendor, like the React SDK provided by Auth0 for any production application I was building. If you're interested in what is going on under the hood in libraries like that, or you have a specific use case, or you're just interested in a hands on example of how PKCE works then I'll go through how I implemented this only using what is available in the browser.
The example code for this blog can be found on GitHub