Crosspulse

Seamless Python ↔ JavaScript Bridge - Bidirectional, fully synchronized cross-language communication library.

Break down language barriers and let Python and JavaScript talk to each other like old friends.

✨ Features

✅ Bidirectional Communication: JS → PY and PY → JS
✅ Synchronous Calls: Full Promise/await support
✅ Event-Based Architecture: Register, listen, and call methods
✅ Error Handling: Exception handling in both languages
✅ Type Safe: JSON serialization with validation
✅ Simple API: Just 3 core methods: register(), listen(), call()
✅ Zero Dependencies: No external packages required
✅ Lightweight: Minimal overhead, maximum performance

🎯 Why Crosspulse?

Ever wanted to combine Python's data processing power with JavaScript's UI capabilities? Or run ML models in Python while displaying results in Node.js? Crosspulse makes it effortless.

// JavaScript
const result = await bridge.call("train_model", data);
console.log("Accuracy:", result.accuracy);

# Python (automatically responds)
bridge.register("train_model", train_ml_model)

That's it. No REST APIs, no HTTP servers, no complexity.

📦 Installation

Download Manual:

JavaScript:

npm install crosspulse

Python:

pip install crosspulse

or Simply copy the files to your project:

crosspulse.py
crosspulse.js

Requirements:

Python 3.7+
Node.js 12+

🚀 Quick Start

Mode 1: JavaScript → Python

Call Python functions from JavaScript.

JavaScript side:

import Crosspulse from "crosspulse/src/crosspulse.js";

async function main() {
  // Create a bridge in "connect" mode
  const bridge = new Crosspulse("connect");
  
  // Connect to the Python script
  await bridge.connect("python main.py");
  
  // Call a Python function and get the result
  const result = await bridge.call("py_add", 10, 20);
  console.log(result); // 30
  
  // Disconnect the bridge
  bridge.disconnect();
}

// Run the main function
main();

Python side:

import crosspulse

# Create a bridge in "listen" mode
bridge = crosspulse.Crosspulse(mode="listen")

# Register a Python method that JS can call
def py_add(a, b):
    return a + b

bridge.register("py_add", py_add)

# Start listening for incoming calls from JavaScript
bridge.listen()

Run:

node app.js

Mode 2: Python → JavaScript

Call JavaScript functions from Python.

Python side:

import crosspulse

# Create a bridge in "connect" mode
bridge = crosspulse.Crosspulse(mode="connect")

# Connect to the JavaScript script
bridge.connect("node app.js")

# Call a JavaScript function and get the result
result = bridge.call("js_multiply", 100, 50)
print(result)  # 5000

# Disconnect the bridge
bridge.disconnect()

JavaScript side:

import Crosspulse from "crosspulse/src/crosspulse.js";

// Create a bridge in "listen" mode
const bridge = new Crosspulse("listen");

// Register a JavaScript method that Python can call
bridge.register("js_multiply", (a, b) => a * b);

// Start listening for incoming calls from Python
bridge.listen();

Run:

python main.py

Mode 3: Bidirectional Communication

Both languages can call each other simultaneously!

Python side:

import crosspulse

# Create a bridge in "connect" mode
bridge = crosspulse.Crosspulse(mode="connect")

# Register Python methods that JavaScript can call
def py_square(x):
    return x ** 2

def py_reverse(s):
    return s[::-1]

bridge.register("py_square", py_square)
bridge.register("py_reverse", py_reverse)

# Connect to the JavaScript script
bridge.connect("node app.js")

# Call JavaScript methods
result = bridge.call("js_capitalize", "hello world")
print(result)  # "HELLO WORLD"

# JavaScript can call py_square() or py_reverse() one request at a time

JavaScript side:

import Crosspulse from "crosspulse/src/crosspulse.js";

// Create a bridge in "listen" mode
const bridge = new Crosspulse("listen");

// Register JavaScript methods that Python can call
bridge.register("js_capitalize", (str) => str.toUpperCase());
bridge.register("js_length", (str) => str.length);

// Start listening for incoming calls from Python
bridge.listen();

// Python can call these methods one request at a time
// Incoming calls are automatically handled

📖 API Reference

Python

from crosspulse import Crosspulse

# Create instance
bridge = Crosspulse(mode="listen")   # Listen mode
bridge = Crosspulse(mode="connect")  # Connect mode

# Register method
bridge.register("method_name", callback_function)

# Listen for calls (listen mode)
bridge.listen()

# Connect to target (connect mode)
bridge.connect("node target_script.js")

# Call remote method
result = bridge.call("method_name", arg1, arg2)

# Disconnect
bridge.disconnect()

JavaScript

import Crosspulse from "crosspulse/src/crosspulse.js";

// Create instance
const bridge = new Crosspulse("listen");   // Listen mode
const bridge = new Crosspulse("connect");  // Connect mode

// Register method
bridge.register("method_name", (arg1, arg2) => { 
  return result;
});

// Listen for calls (listen mode)
bridge.listen();

// Connect to target (connect mode)
await bridge.connect("python target_script.py");

// Call remote method
const result = await bridge.call("method_name", arg1, arg2);

// Disconnect
bridge.disconnect();

🎯 Real-World Examples

Example 1: Data Processing Pipeline

# data_processor.py
import pandas as pd
from crosspulse import Crosspulse

bridge = Crosspulse("connect")
bridge.connect("node visualizer.js")

# Process data in Python
df = pd.read_csv("sales_data.csv")
insights = analyze_sales(df)

# Visualize in JavaScript
chart = bridge.call("create_chart", insights.to_dict())
print(f"Chart created: {chart}")

// visualizer.js
import Crosspulse from "crosspulse/src/crosspulse.js";

const bridge = new Crosspulse("listen");

bridge.register("create_chart", (data) => {
  // Use Chart.js, D3.js, or any JS library
  const chart = generateChart(data);
  return chart.id;
});

bridge.listen();

Example 2: Machine Learning UI

// ml_interface.js
import Crosspulse from "crosspulse/src/crosspulse.js";

const bridge = new Crosspulse("connect");

async function trainModel(dataset) {
  await bridge.connect("python ml_model.py");
  
  const progress = await bridge.call("train", dataset);
  console.log("Training progress:", progress);
  
  const predictions = await bridge.call("predict", testData);
  displayResults(predictions);
}

# ml_model.py
from sklearn.ensemble import RandomForestClassifier
from crosspulse import Crosspulse

bridge = Crosspulse("listen")

model = RandomForestClassifier()

def train_model(data):
    X, y = prepare_data(data)
    model.fit(X, y)
    return {"status": "trained", "accuracy": model.score(X, y)}

bridge.register("train", train_model)
bridge.listen()

Example 3: Web Scraping + Frontend

# scraper.py
from crosspulse import Crosspulse
import requests
from bs4 import BeautifulSoup

bridge = Crosspulse("connect")

def scrape_news():
    # Scrape with Python
    data = scrape_website()
    
    # Send to JavaScript for display
    bridge.call("update_ui", data)

bridge.connect("node server.js")
scrape_news()

Example 4: Desktop App (Electron + Python)

// electron_main.js
import Crosspulse from "crosspulse/src/crosspulse.js";

const bridge = new Crosspulse("connect");

ipcMain.on("process-image", async (event, imagePath) => {
  await bridge.connect("python image_processor.py");
  
  const processed = await bridge.call("enhance_image", imagePath);
  event.reply("image-ready", processed);
});

🔧 Advanced Usage

Error Handling

try {
  const result = await bridge.call("risky_operation", data);
  console.log("Success:", result);
} catch (error) {
  console.error("Python error:", error.message);
}

try:
    result = bridge.call("risky_operation", data)
    print(f"Success: {result}")
except Exception as e:
    print(f"JavaScript error: {e}")

Multiple Arguments & Complex Data

// JavaScript
const result = await bridge.call("process_user", {
  name: "John",
  age: 30,
  tags: ["developer", "python", "javascript"]
});

# Python
def process_user(user_data):
    return {
        "id": generate_id(),
        "name": user_data["name"],
        "processed": True
    }

bridge.register("process_user", process_user)

Async Operations

# Python
import time

def long_running_task(duration):
    time.sleep(duration)
    return "Task completed"

bridge.register("long_task", long_running_task)

// JavaScript
const result = await bridge.call("long_task", 5);
console.log(result); // "Task completed" (after 5 seconds)

🎨 Use Cases

Use Case	Python Side	JavaScript Side
Web Scraping	BeautifulSoup, Scrapy	Display in React/Vue
Machine Learning	TensorFlow, PyTorch	Real-time UI updates
Data Analysis	Pandas, NumPy	Chart.js, D3.js
Image Processing	OpenCV, Pillow	Canvas, WebGL
File Processing	Parse Excel/PDF	Electron file picker
API Gateway	Flask/FastAPI alternative	Frontend communication
Desktop Apps	Backend logic	Electron UI
Automation	Selenium, automation	Control panel

⚡ Performance

Latency: ~5-10ms per call (local)
Throughput: 1000+ calls/second
Memory: Minimal overhead (<5MB)
Scalability: Single process pair

For high-throughput scenarios, consider batching calls or using WebSocket alternatives.

🛡️ Security Notes

Crosspulse uses STDIN/STDOUT for IPC
Only use with trusted code
Validate all incoming data
Don't expose to untrusted networks
Consider sandboxing for production

🐛 Troubleshooting

"Method not found" error

# Make sure method is registered before listening
bridge.register("my_method", my_function)
bridge.listen()  # Must be after register

Connection timeout

// Ensure Python script is running
await bridge.connect("python script.py");
// Python should be in listen mode

JSON serialization errors

# Only use JSON-serializable types
# ✅ str, int, float, list, dict, bool, None
# ❌ Custom objects, functions, file handles

🤝 Contributing

Contributions are welcome! Here's how:

git clone https://github.com/AnarDevStudio/crosspulse.git
cd crosspulse

Areas to contribute:

TypeScript definitions
More examples
Performance improvements
Documentation
Bug fixes

📄 License

MIT License - Use it however you want!

MIT License

Copyright (c) 2026 AnarEsgerzade

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

🌟 Show Your Support

If Crosspulse helps your project, give it a ⭐️ on GitHub!

📞 Support

Issues: GitHub Issues
Discussions: GitHub Discussions
Email: [email protected]

Built with ❤️ by developers who believe languages should work together, not apart.

Crosspulse - Where Python meets JavaScript. 🚀

Made by AnarEsgerzade🌷

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.github/workflows		.github/workflows
example		example
src		src
.gitignore		.gitignore
.npmignore		.npmignore
LICENSE		LICENSE
README.md		README.md
package-lock.json		package-lock.json
package.json		package.json
pyproject.toml		pyproject.toml

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Crosspulse

✨ Features

🎯 Why Crosspulse?

📦 Installation

🚀 Quick Start

Mode 1: JavaScript → Python

Mode 2: Python → JavaScript

Mode 3: Bidirectional Communication

📖 API Reference

Python

JavaScript

🎯 Real-World Examples

Example 1: Data Processing Pipeline

Example 2: Machine Learning UI

Example 3: Web Scraping + Frontend

Example 4: Desktop App (Electron + Python)

🔧 Advanced Usage

Error Handling

Multiple Arguments & Complex Data

Async Operations

🎨 Use Cases

⚡ Performance

🛡️ Security Notes

🐛 Troubleshooting

"Method not found" error

Connection timeout

JSON serialization errors

🤝 Contributing

📄 License

🌟 Show Your Support

📞 Support

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