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Passing a JavaScript list (array) to Python is common in web applications, especially when using frameworks like Flask. The most reliable way is to send the data via AJAX or Fetch API in JSON format and process it in Python.
Using Flask with AJAX (jQuery)
Step 1 – Flask Backend
from flask import Flask, render_template, request, jsonifyapp = Flask(__name__)@app.route("/")def index():return render_template("index.html")@app.route("/process", methods=["POST"])def process():data = request.get_json() # Retrieve JSON data from JSnumbers = data['list'] # Access the listresult = sum(numbers) # Example: sum the listreturn jsonify({"result": result})if __name__ == "__main__":app.run(debug=True)Copied!✕CopyStep 2 – HTML + JavaScript
Pass JavaScript Variables to Python in Flask - GeeksforGeeks
Aug 5, 2025 · In this tutorial, we'll look at using the Flask framework to leverage JavaScript variables in Python. In this section, we'll talk about the many approaches and strategies used to combine the two …
Passing JavaScript variable to Python - Stack Overflow
This might involve having the JS set (making sure you have a fallback for non-JS clients), it might involve using XMLHttpRequest to load new data asynchronously, it might be best using another technique (it …
Code sample
class Global(PyV8.JSClass):passwith PyV8.JSContext(Global()) as ctxt:the_number = ctxt.eval("var pass_to_python = new Number(7)")Pass JavaScript values to and from Python – v8serialize
In this tutorial we will pass JavaScript values between separate Python and Node.js programs using the V8 serialization format. We’ll start off by seeing how V8 serialization works in JavaScript, and how to …
Talking to Python from JavaScript (and Back Again!)
We've seen two different ways of communicating between Python and JavaScript but if either of these aren't for you — don't fret! There are many ways to pass data between these two languages.
How to pass JavaScript Variables to Python in Flask?
In this tutorial, we are going to learn how to pass a JavaScript variable to a Python Variable using the Python Flask Framework.
JavaScript to Python Mastery Guide: Syntax, Data Structures, OOP ...
May 28, 2025 · By understanding these parallels and utilizing these resources, you'll efficiently transition from JavaScript to Python, leveraging your existing knowledge along the way.
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Jan 31, 2023 · In conclusion, this tutorial demonstrates the process of passing data between the front end and back end using Flask and JavaScript. We covered how …
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Pyscript/Pyodide and JS Object Passing - jeff.glass
Aug 21, 2022 · ⚠️ Pass objects from Python running in PyScript to JavaScript, with a little extra work. See the commentary and live demo with the code sample below. For our purposes, an 'object' is …
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