How can i convert my obj result to AST

[jhyg]

I want to implement my parser work like this demo "http://mazko.github.io/jsjavaparser/"

but my parser return object and finish like this

how can I convert that object to AST ?

what's problem in my code ?
I'm using vuejs and npm 7.24.0

here is my code:

var japa = require("java-parser");
console.log(japa.parse(string)); 

pls, I need help
thanks