@rabbit-company/logger
v4.0.0
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Simple logger
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Logger-JS
Logger-JS
is a lightweight logging utility for JavaScript (ES6) that provides various logging levels and supports NDJson formatting for structured logging.
Table of Contents
Installation
To install Logger-JS
, use npm to add it to your project:
npm i --save @rabbit-company/logger
Importing the Library
After installation, you can import the Logger
into your JavaScript file:
import Logger from "@rabbit-company/logger";
Configuration
Configure the logger to suit your needs. You can set the log level to control which types of messages are logged:
// Set the log level to SILLY to enable all levels of logging
Logger.level = Logger.Levels.SILLY;
// Enable or disable colored output
Logger.colors = true; // Set to false to disable colors
// Enable or disable NDJson logging
Logger.NDJson = false; // Set to true to enable NDJson logging
Logging Messages
Use the provided methods to log messages at different levels of severity:
// Log an error message
Logger.error("This is an error message.");
// Log a warning message
Logger.warn("This is a warning message.");
// Log an informational message
Logger.info("This is an informational message.");
// Log an HTTP-related message
Logger.http("This is an HTTP-related message.");
// Log a verbose message
Logger.verbose("This is a verbose message.");
// Log a debug message
Logger.debug("This is a debug message.");
// Log a silly message
Logger.silly("This is a silly message.");
NDJson Logging
When NDJson logging is enabled, log messages are formatted as newline-delimited JSON. You can retrieve the NDJson formatted log using:
// Enable NDJson logging
Logger.NDJson = true;
// Retrieve NDJson log data
const ndjsonLog = Logger.getNDJson();
console.log(ndjsonLog);
// Clear NDJson log data
Logger.resetNDJson();
Customization
1. Customizing Log Colors
You can customize the colors associated with different logging levels by modifying the LevelColors
mapping:
// Change colors for different log levels
Logger.LevelColors[Logger.Levels.ERROR] = Logger.Colors.BRIGHT_RED;
Logger.LevelColors[Logger.Levels.INFO] = Logger.Colors.GREEN;
2. Customizing Log Message Format
You can also customize the format of the log messages by setting the Logger.format
string. This format string can include the following placeholders:
{date}
: Inserts the current timestamp.{type}
: Inserts the log level type (e.g., ERROR, INFO).{message}
: Inserts the actual log message.
Example of customizing the log format:
// Set a custom log message format
Logger.format = "[{date}] - {type}: {message}";