How do you import libraries to a macro?

EmEditor can import certain JavaScript libraries to macros if you are using the new V8 engine on EmEditor v22.1.0 or greater. Most browser-compatible libraries can be used in V8. See the “limitations” section for compatibility information.

After you found a browser-compatible library, follow these steps to import it into a macro.

  1. Download the minified .js file of the library.
    • A non-minified file may not work if it imports another file.
    • As an example, to use the datetime library Luxon, download the minified file under Basic Browser Setup.
  2. Open EmEditor. Switch to the v8 engine by going to Macros | Customize… and checking Use V8 as JavaScript engine.
  3. Create a new .jsee file. On the top of the file, write #include "library.js", replacing library.js with the relative or absolute path to the downloaded JS file.
    • Don’t forget to escape backslashes. "C:\\folder\\folder"
    • If luxon.min.js was downloaded to the same folder, include it with #include "luxon.min.js".

To test if Luxon was imported correctly, we can run the following macro which prints the current time.

#include "luxon.min.js"


  • Node APIs and npm cannot be accessed in V8.
  • Certain Web APIs, such as import, fetch, and DOM manipulation are unavailable in V8.