Mongo-logger-2.0 NPM

MongoLogger 2.0

MongoLogger 2.0 is an advanced logging utility that interacts with a MongoDB database to store, retrieve, and manipulate log entries. It provides various methods for logging different types of messages and supports templating for structured log messages.

Installation

Install the MongoLogger 2.0 package via npm:

npm install mongo-logger-2.0

Usage

Initialize MongoLogger

First, initialize MongoLogger with your MongoDB connection URI. Since initialization may take some time to connect to the database, make sure to use await or handle promises accordingly:

const MongoLogger = require("mongo-logger-2.0");
const logger = new MongoLogger("mongodb://localhost:27017/mydb");

async function initializeLogger() {
  try {
    await logger.initialize();
    console.log("MongoLogger initialized successfully");
  } catch (err) {
    console.error("Failed to initialize MongoLogger:", err);
  }
}

// Call the initialize function
initializeLogger();

!WARNING
Note: By default, logs are not printed to the console (print option is false). If you wish to print logs to the console, explicitly set the print option to true when using logging methods.

Logging Methods

MongoLogger 2.0 provides methods to log messages of different types (error, info, warn, debug, fatal):

// Logging examples
logger.error("An error occurred", { print: true });
logger.info("Information message");
logger.warn("Warning message", { print: true });
logger.debug("Debugging message");
logger.fatal("Fatal error", { print: true });

Each logging method accepts a message string and an optional option object with a print property to specify whether to print the log to the console.

Creating a New Type Method

To create a new log type, use logger.new. This method simplifies adding a log entry of a specified type and message to the database. Here's how you can use it:

Type: Specify the type of log entry.
Message: Provide the log message.
Options: Include additional options such as print to control console logging.

Example:

logger.new("type", "This is a new type of log", { print: true });

Templating

MongoLogger 2.0 supports templating for structured log messages. Use createTemplate to define templates and useTemplate to apply them:

// Create a template
logger.createTemplate(
  "error",
  "errorTemplate",
  "Error occurred: {% message %}"
);

// Use the template with data
logger.useTemplate(
  "errorTemplate",
  { message: "Connection timeout" },
  { print: true }
);

// Note: Templates are not persisted in the database. You need to recreate them upon API restart.

Retrieving Logs

You can retrieve logs based on various criteria such as date range, log type, and more:

// Retrieve logs for a specific date
const date = new Date("2023-07-15");
let result = await logger.getLogForDay(date, { type: "error" })

console.log(result)

// Retrieve logs between two dates
const startDate = new Date("2023-07-01");
const endDate = new Date("2023-07-15");
let result = await  logger.getLogBetweenDate(startDate, endDate, { type: "warn" })
 
console.log(result)

// Retrive last logs
let result = await logger.findLogs({limit: 3, type: "error"})

Printing Logs

Print logs directly to the console using printLogForDay, printLogBetweenDate or printLogs methods:

// Print logs for a specific date
const date = new Date("2023-07-15");
logger.printLogForDay(date, { type: "error" }).catch((err) => {
  console.error("Error printing logs:", err);
});

// Print logs between two dates
const startDate = new Date("2023-07-01");
const endDate = new Date("2023-07-15");
logger
  .printLogBetweenDate(startDate, endDate, { type: "warn" })
  .catch((err) => {
    console.error("Error printing logs:", err);
  });

// Print last logs
logger.printLogs({limit:3 type: "error"})

Creating Log Files

Create JSON log files using createLogFileForDay or createLogFileBetweenDate methods:

// Create a log file for logs on a specific date
const date = new Date("2023-07-15");
logger
  .createLogFileForDay(date, "./logs/log-2023-07-15.json", { type: "error" })
  .catch((err) => {
    console.error("Error creating log file:", err);
  });

// Create a log file for logs between two dates
const startDate = new Date("2023-07-01");
const endDate = new Date("2023-07-15");
logger
  .createLogFileBetweenDate(
    startDate,
    endDate,
    "./logs/log-2023-07-01-to-2023-07-15.json",
    { type: "warn" }
  )
  .catch((err) => {
    console.error("Error creating log file:", err);
  });