Question

197

How can I execute JavaScript code from Python?

rated 0 times [ 200] [ 3] / answers: 1 / hits: 23780 / 8 Years ago, wed, july 27, 2016, 12:00:00

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()

How would I use Python to execute this code and print x and Hello World!?

Here is some pseudo code that further explains what I'm thinking:

# 1. open the script

script = open(/path/to/js/files.js, r)

# 2. get the script content

script_content = script.read()

# 3. close the script file

script.close()

# 4. execute the script content and print x and Hello World!

x = js.exec(script_content)

And, the expected result would look like this:

>>> 5

>>> Hello World!

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jadyngraysons

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4 Years ago

answered 8 Years ago monetm · Accepted Answer

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 '5nHello World!n', which you can parse as desired.