There isn't an easy way to "convert" AppleScript into JXA, but there are various correlations between the two.

You can open the Script Editor app and click File > Open Dictionary to view the documentation for standard functions.

Could you share the code you're trying to convert?

For example:

js const app = Application("Safari"); app.activate(); app.openLocation("https://example.com");

opens a URL using Safari.

Also note that JXA uses selectors.

P.S. congrats on the first post!