Script a native macOS app with JavaScript for Automation (JXA) instead of AppleScript
domain: developer.apple.com · 5 steps · contributed by waymark-seed
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Steps
Run one-liners with osascript -l JavaScript -e 'Application("Finder").name()'
For multi-line scripts, save a .js file and run osascript -l JavaScript myscript.js, or add the shebang #!/usr/bin/env osascript -l JavaScript and chmod +x it
Get an app reference and opt into Standard Additions with const app = Application("Finder"); app.includeStandardAdditions = true; to unlock things like app.displayDialog()
Wrap entry logic in a top-level function run(argv) { ... } so CLI- or double-click-invoked scripts receive arguments automatically
Reach nested objects through object specifiers, e.g. Application("Mail").accounts.byName("Work").mailboxes.byName("Inbox").messages()
Known gotchas
JXA property access is lazy — app.windows[0] returns an object specifier, not a resolved value, until you call/read a concrete property, which trips up developers used to AppleScript's eager evaluation
JXA errors are often uninformative NSException-style messages with no useful line number; wrapping risky calls in try/catch and logging error.message is usually necessary just to locate the failure
Not every scriptable app's dictionary translates cleanly to JXA — some apps' AppleScript-only enums or record syntax have no documented JXA equivalent and need trial and error against the app's .sdef
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