index.js

import express from 'express';
import accountsRouter from './routes/account.routes.js';
import winston from 'winston';
import { promises as fs } from 'fs';

const { readFile, writeFile } = fs;

global.fileName = 'accounts.json';

const { combine, timestamp, label, printf } = winston.format;
const myFormat = printf(({ level, message, label, timestamp}) => {
	return `${timestamp} [${label}] ${level}: ${message}`; 
})

global.logger = winston.createLogger({
	level: "silly",
	transports: [
		new (winston.transports.Console)(),
		new (winston.transports.File)({filename: "my-bank-api.log"})
	],
	format: combine(
		label({ label: "my-bank-api"}),
		timestamp(),
		myFormat
	)
})

const app = express();
app.use(express.json());
app.use('/account', accountsRouter);
app.listen(3000, async () => {
	try {
		await readFile(fileName);
		logger.info('API STARTED');
	} catch (err) {
		const initialJson = {
			nextId: 1,
			accounts: [],
		};
		writeFile(fileName, JSON.stringify(initialJson))
			.then(() => {
				logger.info('API STARTED and File Created');
			})
			.catch((err) => {
				logger.error(err);
			});
	}
});