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node-oauth2-server
🚀 The successor to oauthjs/oauth2-server. 🔒 Complete, compliant, maintained and well tested OAuth2 Server for node.js. Includes native async await and PKCE. (by node-oauth)
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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's a module on npm that abstracts away the "complicated" bits of oauth - you define just the model functions (like, "retrieve access token", "retrieve valid clients", etc.) and integrations into the request/responses with your favourite web framework -- see https://github.com/node-oauth/node-oauth2-server -- this is a fork of another module that was abandoned. I use this in prod.