index.js

const Express = require('express');
const cors = require('cors');
const net = require('net');
const Web3 = require('web3'); 
const dotenv = require('dotenv');
dotenv.config({}); 
const ipc = process.env.IPC || '/mnt/geth/geth.ipc';
const web3 = new Web3(new Web3.providers.IpcProvider(ipc, net));
const app = Express();
app.use(Express.json({ limit: '50mb' }));
app.use(cors());
app.post('/nonces', async (request, response) => {
    const accounts = request.body.accounts;
    const tasks = [];
    accounts.forEach((account) => {
        tasks.push(
            new Promise(async (resolve, reject) => {
                try {
                    const count = await web3.eth.getTransactionCount(account); 
                    resolve({ account, count }); 
                } catch (error) {
                    resolve({ account, count: 0 });
                }
            })
        )
    }); 
    response.send(await Promise.all(tasks)); 
});
app.post('/contract-codes', async (request, response) => {
    const contracts = request.body.contracts;
    const tasks = [];
    contracts.forEach((contract) => {
        tasks.push(
            new Promise(async (resolve, reject) => {
                try {
                    const code = await web3.eth.getCode(contract); 
                    resolve({ contract, code }); 
                } catch (error) {
                    resolve({ contract, code: "0x" });
                }
            })
        )
    }); 
    response.send(await Promise.all(tasks)); 
});
app.post('/transaction-receipts', async (request, response) => {
    const hashes = request.body.hashes;
    const tasks = [];
    hashes.forEach((hash) => {
        tasks.push(
            new Promise(async (resolve, reject) => {
                try {
                    const receipt = await web3.eth.getTransactionReceipt(hash); 
                    resolve({ hash, receipt }); 
                } catch (error) {
                    resolve({ hash, receipt: null });
                }
            })
        )
    }); 
    response.send(await Promise.all(tasks)); 
});
const port = process.env.PORT || 80;
app.listen(port);
console.log("listening on port " + port);