A simple coloured logger, with file support. All messages are nicely styled, coloured and logged to the console, and to two files: one for combined logs, and one for errors.

Installation

npm install coloured-logger

Usage

This package is very simple to use, and can be required and set up on a single line:

const logger = require("coloured-logger")(options);

Requiring returns an object that you can use to log your messages.

Features

• Logs to the console and (optionally) to files, one for combined logs and one for errors.
• Supports custom logging levels and different colours.
• No dependencies and very lightweight.
• Ready to use straight out of the box, no additional configuration is necessary.
• Logs timestamps to the console, and date + timestamps to files.

Options

• outputFile - A filename for the combined log file. Defaults to output.log.
• errorFile - A filename for the error log file. Defaults to error.log.
• useFiles - Specifies whether you want to use files or not. Default is true.
• logName - The name of the logger, to show next to each message. Default is the filename of the calling file.
• useLogName - Specifies whether you want to use a log name for this logger. Default is false. This is not needed if you use logName.

Note: All options are optional, none are required. By default, output files are set to output.log and error.log for combined and errors, respectively. All logs are kept in the logs directory.

Functions

• logger.info(message) - Logs an information message.
• logger.warn(message) - Logs a warning message.
• logger.error(message) - Logs an error message.
• logger.log(message, level, colour) - Logs a message with the given level and colour.
• logger.addLevel(level) - Adds a custom level to the logger.Level object.
• logger.setLogName([name]) - Sets the name of the logger, if no name specified then will default to the filename of the calling file.

Additional Information

Available Colours:

• RED, GREEN, YELLOW, BLUE, MAGENTA, CYAN, WHITE, GREY
• RESET (used to reset the colour of the text to the default)

All colours can be accessed from the logger.Colour object.

Example Usage

const logger = require("./index")({ useFiles: false, useLogName: true, logName: "Tests" }),
    Colour = logger.Colour,
    Level = logger.Level;

// Info, Warning and Error Messages
logger.info("Information message :)");
logger.warning("Warning messsage :/");
logger.error("Error message :( \n");

// Custom Levels & Messages
logger.addLevel("CUSTOM");
logger.log("Custom message!", Level.CUSTOM, Colour.MAGENTA);

// Object Logging
let obj = {
    str: "string",
    num: 100,
    bool: false,
    obj: {}
};
logger.info(obj);

// Changing the Log Name
logger.setLogName();

// Time Stamp Check
setTimeout(() => {
    logger.info("Time stamp check.");
}, 1000);

Output:

The example code can be found in the tests.js file.

License

I am using the MIT License for this package.