date-log

Log messages into structured files with ISO date prefix.

4 default files available. Possibility to generate own log files.

Connection log in different log file.

Install and import

npm install --save date-log
yarn add date-log

var Log = require('date-log');

Usage:

date-log receives messages and/or objects and perform a console.log or console.error with a date prefix [YYYY-MM-DD HH:mm:ss].

It also writes down this log into a text file allocated in a folder with route equal to the date it is written.

Example:

+ client
+ dist
- log
  - 2017
    + 09
    - 10
      - 03
        - out.log
        - err.log
        - conn.log
      - 04
        - out.log
        - err.log
        - conn.log
+ node_modules
+ server

Functions:

Log.redirectConsole()

From the moment this function is called, every console.log or console.error will be redirected to Log.log and Log.error respectively.

Recommended for production deployment.

Log.log(message: string, obj: object, show: boolean)

Writes the given string message, if any, and the stringified object into out.log file.

If show flag is passed, it also sends the message to console.log (for developing purposes)

Log.error(message: string, obj: object, show: boolean)

Writes the given string message, if any, and the stringified object into err.log file.

If show flag is passed, it also sends the message to console.error (for developing purposes)

Log.write(filename: string, message: string, obj: object, show: boolean)

Writes the log given string message, if any, and the stringified object into .log file.

If show flag is passed, it also sends the message to console.error (for developing purposes)

The log file with given name remains open for further usage.

Log.connection_log(req: Request, message: string, allowed: boolean, show: boolean)

If allowed is true, this function logs the connection was succesful.

Else, it uses the Request object sent to create a log of the connection details. Then it returns an object with the following structure

{
  hostname: string,
  ip: string,
  location: {
    country: string,
    city: string,
    coords: []
  }
}

• location can return null if ip geolocalization was not possible.

It also writes this object into conn.log.

Example:

function notFound(req, res) {
  if (!whitelist.includes(req.header('Origin'))) {
      Log.connection_log(req, 'Unexpected request');
  }
  res.status(404).send('Access forbidden');
}