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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.
They recently added shareable links:
> Stand-alone links (shareable direct links to games)
Web 2.0 has made it so fractured that massive communities exist on /r/EmuDev, Emulator 101 is a well known source for new learners, nesdev.org is the reference for NES stuff, a shitton of the data we have is from the Web 1.0 days and is just as fractured, and we even have repos like https://github.com/marethyu/awesome-emu-resources that collect a shitload of useful stuff (including the test ROMs that other commenters have mentioned, that will only work if you perfectly emulate the target system).
As well as that, many people are decapping entire chips and games, just for exact emulation. So, no, you're talking out your ass, sorry.