How to run JSPython interpreter

Install JS Python Interpreter

npm i jspython-interpreter

How to use JS Python Interpreter

ECMAScript module

import { jsPython } from 'jspython-interpreter';

CommonJS module

const jsPython = require('jspython-interpreter').jsPython;

Append <script> in html

<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/jspython-interpreter/dist/jspython-interpreter.min.js"></script>

<script>

const jsPython = window.jspython.jsPython

</script>

Create interpreter and evaluate script.

const script = `

x = 2 + 3

x

`;

const interpreter = jsPython();

interpreter.evaluate(script).then(res => {

consoe.log(res); // 5

})

Expose functions for JSPython import

Install needed modules localy using npm install moduleName command.

Register package loader function to use js libraries in your script.

In browser app

import * as papaparse from 'papaparse';

import * as dataPipe from 'datapipe-js';

const AVAILABLE_PACKAGES = {

papaparse,

'datapipe-js': dataPipe

};

interpreter.registerPackagesLoader((packageName) => {

return AVAILABLE_PACKAGES[packageName];

});

In NodeJS

interpreter.registerPackagesLoader((packageName) => {

return require(packageName);

});

Import js libraries in script

import axios // import library

from fs import readFileSync as rfs, writeFileSync // import only methods from library

import json5 as JSON5 // use as to provide appropriate name for lib.

res = axios.get("data/url")

Register to the global scope

Make custom function available in script.

interpreter.addFunction('greeting', (name) => {

return 'Hello ' + name + '!';

});

await interpreter.evaluate('greeting("John")') // Hello John.

Make object availabel in script

interpreter.assignGlobalContext({

method1: () => 1,

prop1: 2

})

const script = `

v = method1() + prop1

v

`

await interpreter.evaluate(script) // 3.

Provide evaluation context

const script = `

v = prop1 + prop2

v

`

await interpreter.evaluate(script, {prop1: 3, prop2: -2}) // 1