vanilla-jsoneditor

esm Styles
A web-based tool to view, edit, format, transform, and validate JSON
Version 3.5.0 License ISC
<link href=" https://cdn.jsdelivr.net/npm/vanilla-jsoneditor@3.5.0/themes/jse-theme-dark.min.css " rel="stylesheet">
No default CSS file set by the package author so the URL is guessed. You can always browse all package files to use another one.