create-nodejs-express/assets/errorHandler.js

A package for creating a folder structure for nodejs/express application

module.exports =  `const fs = require('fs');
const path = require('path')

const errorHandler = (err, req, res, next) => {
    const status = err.statusCode || 500;
    const msg = err.message || 'Server error';

    const ErrorObj = {
        success: err.success,
        statusCode: status,
        isOperational: err.isOperational || false,
        request: req.method + " " + req.originalUrl,
        domain: err.domain || undefined,
        message: '🔥Error🔥: ' + msg,
        date: new Date().toGMTString(),
        stack: err.stack,
    }

    // Logging the error to the log.txt file
    let date = new Date();
    let dirname = path.join('log', date.toLocaleDateString().split('/').join('_'));
    let filename = path.join(dirname , date.getUTCHours() + '.log');
    let data = JSON.stringify(ErrorObj, null, 2) + '\\r\\n\\n';

    const appendLogger = () => {
        fs.appendFile(filename, data, (err) => {
            if (err) return console.log('Error: writing logger', err)
        })
    }

    fs.exists(dirname, (exists) => {
        if (exists) {return appendLogger()}

        fs.mkdir(dirname, (err) => {
            if (err) return console.log(err)
            appendLogger()
        })
    })

    if (process.env.NODE_ENV !== 'development') {
        delete ErrorObj.domain;
        delete ErrorObj.request;
        delete ErrorObj.isOperational;
        delete ErrorObj.stack;
        delete ErrorObj.date;
    }

    res.status(status).json(ErrorObj);
}


module.exports = errorHandler`;