Consume ES Module Libraries from CommonJS Apps By Creating a Simple Node Server

// simpleServer.mjs

import { createServer } from 'http';
import { parse } from 'url';
import { parse as queryParse } from 'querystring';

const server = createServer((req, res) => {
    const parsedUrl = parse(req.url, true);
    if (parsedUrl.pathname === '/api' && req.method === 'POST') {
        let body = '';
        req.on('data', chunk => {
            body += chunk;
        });
        req.on('end', () => {
            const { urlParam, longString, obj } = queryParse(body);

            // Do something with the received parameters...
            console.log('Received parameters:', { urlParam, longString, obj });

            res.writeHead(200, { 'Content-Type': 'application/json' });
            res.end(JSON.stringify({ status: 'success' }));
        });
    } else {
        res.writeHead(404, { 'Content-Type': 'text/plain' });
        res.end('Not Found');
    }
});

server.listen(3000, () => {
    console.log('Server running on http://localhost:3000');
});

curl -X POST -H "Content-Type: application/x-www-form-urlencoded" -d "urlParam=http://example.com&longString=This%20is%20a%20long%20string.&obj={\"key\":\"value\"}" http://localhost:3000/api

// simpleServer.mjs

import { createServer } from 'http';
import { parse } from 'url';
import { parse as queryParse } from 'querystring';

// Mock promise function to simulate asynchronous processing
function processRequestData(data) {
    return new Promise((resolve, reject) => {
        setTimeout(() => {
            if (data) {
                resolve({ result: 'Processed successfully!' });
            } else {
                reject(new Error('Failed to process data.'));
            }
        }, 1000);
    });
}

const server = createServer((req, res) => {
    const parsedUrl = parse(req.url, true);
    if (parsedUrl.pathname === '/api' && req.method === 'POST') {
        let body = '';
        req.on('data', chunk => {
            body += chunk;
        });
        req.on('end', () => {
            const { urlParam, longString, obj } = queryParse(body);

            // Use the promise function to process data
            processRequestData({ urlParam, longString, obj })
                .then(responseData => {
                    res.writeHead(200, { 'Content-Type': 'application/json' });
                    res.end(JSON.stringify(responseData));
                })
                .catch(error => {
                    res.writeHead(500, { 'Content-Type': 'application/json' });
                    res.end(JSON.stringify({ error: error.message }));
                });
        });
    } else {
        res.writeHead(404, { 'Content-Type': 'text/plain' });
        res.end('Not Found');
    }
});

server.listen(3000, () => {
    console.log('Server running on http://localhost:3000');
});

// commonjsApp.js (CommonJS)

const http = require('http');
const querystring = require('querystring');

function consumeAPI(urlParam, longString, obj) {
    const postData = querystring.stringify({
        urlParam,
        longString,
        obj: JSON.stringify(obj)
    });

    const options = {
        hostname: 'localhost',
        port: 3000,
        path: '/api',
        method: 'POST',
        headers: {
            'Content-Type': 'application/x-www-form-urlencoded',
            'Content-Length': Buffer.byteLength(postData)
        }
    };

    const req = http.request(options, res => {
        res.setEncoding('utf8');
        let responseBody = '';
        res.on('data', chunk => {
            responseBody += chunk;
        });
        res.on('end', () => {
            console.log('API response:', responseBody);
        });
    });

    req.on('error', error => {
        console.error(`Request error: ${error.message}`);
    });

    req.write(postData);
    req.end();
}

// Example usage:
consumeAPI('http://example.com', 'This is a long string.', { key: 'value' });

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