jsoneditor

js Styles
A web-based tool to view, edit, format, and validate JSON
Version 10.2.0 License Apache-2.0
<link href=" https://cdn.jsdelivr.net/npm/jsoneditor@10.2.0/dist/jsoneditor.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.