@kele23/fe-aem-server/src/utils/logger.js

FE AEM Server

import winston from 'winston';

// Define your severity levels.
// With them, You can create log files,
// see or hide levels based on the running ENV.
const levels = {
    error: 0,
    warn: 1,
    info: 2,
    http: 3,
    debug: 4,
};

// This method set the current severity based on
// the current NODE_ENV: show all the log levels
// if the server was run in development mode; otherwise,
// if it was run in production, show only warn and error messages.
const level = () => {
    const env = process.env.NODE_ENV || 'development';
    const isDevelopment = env === 'development';
    return isDevelopment ? 'debug' : 'warn';
};

// Define different colors for each level.
// Colors make the log message more visible,
// adding the ability to focus or ignore messages.
const colors = {
    error: 'red',
    warn: 'yellow',
    info: 'green',
    http: 'magenta',
    debug: 'white',
};

// Tell winston that you want to link the colors
// defined above to the severity levels.
winston.addColors(colors);

// Chose the aspect of your log customizing the log format.
const format = winston.format.combine(
    // Add the message timestamp with the preferred format
    winston.format.timestamp({ format: 'YYYY-MM-DD HH:mm:ss:ms' }),
    // Tell Winston that the logs must be colored
    winston.format.colorize({ all: true }),
    // Define the format of the message showing the timestamp, the level and the message
    winston.format.printf((info) => `${info.timestamp} ${info.level}: ${info.message}`),
);

// Define which transports the logger must use to print out messages.
// In this example, we are using three different transports
const transports = [
    // Allow the use the console to print the messages
    new winston.transports.Console(),
];

// Create the logger instance that has to be exported
// and used to log messages.
const Logger = winston.createLogger({
    level: level(),
    levels,
    format,
    transports,
});

export default Logger;