Include Functions from other files in Node.js

In this tutorial, we will demonstrate how to include functions from other files in Node.js by spawning a Node.js process as a child_ process module within python scripts.

Create a File

Create a file to store reusable functions. Use the child_process module to connect a python file with Node.js. Since Node.js does not directly accept Python scripts, we utilize the child process to spawn the Python script,

const{spawn} = require('child_process')

Import Libraries

To import libraries,

import json
import sys

Organize a Code

Δ STEPS :

• Node.js acts as the main server and uses the ‘child_process‘ module to communicate with a Python script for user registration and login. The Python script manages user data in memory and handles registration and credential verification.

  python.stdin.write(dataToSend);
  python.stdin.end();
  
  let dataFromPython = '';
  python.stdout.on('data', function (data) {
    console.log('Data received from Python script:');
    dataFromPython += data.toString();  
  });
  
  python.stderr.on('data', (data) => {
    console.error(Error message from Python script: ${data});
  });

• When a request is made, Node.js sends a JSON object to the Python script via standard input (stdin). The script processes the data and returns the result through standard output (stdout), which Node.js then sends back to the client.

def register():
    try:
        firstname = input("Enter first name: ")
        lastname = input("Enter last name: ")
        username = input("Enter Username: ")
        password = input("Enter Password: ")

        # Add user to the in-memory database
        users.append({"firstname": firstname, "lastname": lastname, 
        "username": username, "password": password})
        print("Registration completed")
        return {"message": "Registration completed"}

def login():
    try:
        username = input("Enter Username: ")
        password = input("Enter Password: ")

        # Check credentials
        user = next((user for user in users if user['username'] == username
        and user['password'] == password), None)
        if user:
            print("Login successful")
            return {"message": "Login successful"}
        else:
            print("Login failed! Incorrect username or password.")
            return { "Login failed! Incorrect username or password."}

Run a File

Therefore successfully executes a file.

Conclusion

Therefore, Node.js manages the server-side logic and tasks such as registration and login are connected to a Python script. This script processes the data and returns the results. Hence successfully demonstrated on how to include functions from other files in Node.js by spawning a Node.js process as a child_ process module within Python scripts.