How can I execute JavaScript code from Python?

Question

Lets say that I have this code inside a JavaScript file:

var x = 10;
x = 10 - 5;
console.log(x);
function greet() {
  console.log(\"Hello World!\");
}
greet(         


        

Answer 1

The module Naked does exactly this. pip install Naked (or install from source if you prefer) and import the library shell functions as follows:

from Naked.toolshed.shell import execute_js, muterun_js

response = muterun_js('file.js')
if response.exitcode == 0:
  print(response.stdout)
else:
  sys.stderr.write(response.stderr)

For your particular case, with file.js as

var x = 10;
x = 10 - 5;
console.log(x);
function greet() {
      console.log("Hello World!");
}
greet()

the output is '5\nHello World!\n', which you can parse as desired.