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devtools-x
Collection of offline first developer utilities available as desktop application. all in one place, cross-platform!
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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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CyberChef
The Cyber Swiss Army Knife - a web app for encryption, encoding, compression and data analysis
Someone responded to your GitHub issue that it seems related to the Content Security Policy. https://github.com/fosslife/devtools-x/issues/22#issuecommen...
I use this which does not require and installation https://gchq.github.io/CyberChef/