When comparing JS Page vs Zettlr, the Slant community recommends Zettlr for most people. In the question“What is the best WYSIWYG Markdown editor?” Zettlr is ranked 9th while JS Page is ranked 18th. The most important reason people chose Zettlr is:
While many Markdown editors don't offer specific support for a certain type of workflow, or offer features for scientific workflows only, Zettlr offers features that help the writing process of journalists or researchers in the arts and humanities. It's a lot more text-focused than most editors.
Specs
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Pros
Pro It comes with code formatter
It uses prettier to format the javascript code
Pro It has webpage viewer with the dev tools
Pro You can run javascript code with button clicks
It is quite different from other Javascript tool because it does not change the HTML file when it runs.
Pro Insert javascript code than totally reload the webpage
This is useful for testing webpage. You can run javascript code on live website as well.
Pro Drag and drop to add multiple script tags
It adds script tags by drag and drop. So it saves some time when we needs to add multiple script tags in base html file for web development.
Pro This can be used for the javascript coding test
When we hire frontend developers, we can use JS Page for their javascript coding test. We can observe more Javascript skills in that way.
Pro It has HTML editor
You can edit HTML file.
Pro Support node integration and Node VM
You can use the default node modules.
Pro You can read and write a file with the program without Node.js
It contains Node.js in the program so you can read and write a file with the default node modules.
Pro Focuses on writers
While many Markdown editors don't offer specific support for a certain type of workflow, or offer features for scientific workflows only, Zettlr offers features that help the writing process of journalists or researchers in the arts and humanities. It's a lot more text-focused than most editors.
Pro Citation support
While it supports a diverse range of syntax (chart, easy image insert, etc.) found in other editors, the great citation support made it possible to write real articles. Citation from Zotero and Mendeley can be inserted easily which is a huge plus.
Pro Almost perfect
This is the best option, still not perfect, there are some bugs like creating / editing tables and resizing images, but the PROS destroy the CONS, easy quotes, WYSIWYM , attachments tab (supports attaching and opening links to any file), table of contents, TAGs, easy hyperlink between files (same as citations), export to many formats (like Word, HTML5, PDF)...
Pro Renders math in-place through KaTex
Cons
Con It is not free
The program is not free.
Con You need a steam account
If you don't have a steam account, you need to get it to use the program.
Con This is actually not an IDE
The developer mentioned that JS Page is not an IDE but you can use it like a Javascript IDE
Con Obtrusive, like someone WITH CAPS LOCK ON
Too loud, too much going on, and definitely an in-your-face sort of feeling.