https://www.indiehackers.com/post/small-logger-function-for-javascript-projects-2e49c040ce

small-logger.js

const { format } = require("date-fns");

/**
 * logger is a small tool to centralize the logging of the application
 * [@params](/params) {String} src - this will be prefixed before each message. It can be any string
 * that would be significant when you read them in the logs (often in this code base it's the name
 * of the file from where the log is sent)
 */
const logger = (src) => {
  return {
    /**simply displays the message in the console
     * [@param](/param) {String} msg - the message to be displayed
     * [@return](/return) - nothing
     */
    info: (msg) => {
      const now = format(new Date(), "dd/MM/yyyy HH:mm");
      console.log(`${now} info - ${msg} (${src})`);
    },
    /** displays the message in the console with a warning prefix
     * [@param](/param) {String} msg - the message to be displayed
     * [@return](/return) - nothing
     */
    warn: (msg) => {
      const now = format(new Date(), "dd/MM/yyyy HH:mm");
      console.warn(`${now} warning - ${msg} (${src})`);
    },
    /** displays the message in the console with an error prefix
     * [@todo](/todo) send the error to slack in production environment
     * [@param](/param) {String} msg - the message to be displayed
     * [@return](/return) - nothing
     */
    err: (error) => {
      const now = format(new Date(), "dd/MM/yyyy HH:mm");
      // in production, send to slack/email
      console.error(`${now} ERROR - ${error.message || error} (${src})`);
    },
  };
};

module.exports = logger;