Welcome to the Ultimate Guide to lambda-logger-node

lambda-logger-node is a powerful tool designed to facilitate logging in AWS Lambda functions. It simplifies the process of debugging and monitoring Lambda functions, making it an essential tool for developers. In this guide, we will explore the basics of lambda-logger-node and provide extensive examples to help you get started.

Getting Started with lambda-logger-node

First, install lambda-logger-node using npm:

  npm install lambda-logger-node

Basic Usage

Below is a simple example demonstrating the basic usage of lambda-logger-node:

  
    const Logger = require('lambda-logger-node');
    const logger = new Logger();

    exports.handler = async (event) => {
      logger.info('Lambda function executed');
      return {
        statusCode: 200,
        body: JSON.stringify('Hello from Lambda')
      };
    };
  

Logging Levels

lambda-logger-node supports multiple logging levels: info, debug, warn, and error. Here are examples of each:

  
    logger.info('This is an info message');
    logger.debug('This is a debug message');
    logger.warn('This is a warning message');
    logger.error('This is an error message');
  

Structured Logging

You can also log structured data, which is useful for logging objects and arrays:

  
    logger.info('User details', { id: 1, name: 'John Doe' });
  

Creating a Logger with Custom Settings

You can customize the logger by passing settings when creating an instance:

  
    const customLogger = new Logger({ level: 'debug', context: { functionName: 'myFunction' } });
    customLogger.debug('This is a debug message with custom settings');
  

Application Example

Below is an example of a complete Lambda function utilizing lambda-logger-node:

  
    const Logger = require('lambda-logger-node');
    const logger = new Logger();

    exports.handler = async (event) => {
      try {
        logger.info('Starting handler');
        // Simulate some processing
        const result = processData(event);
        logger.info('Processing complete', result);
        return {
          statusCode: 200,
          body: JSON.stringify(result)
        };
      } catch (error) {
        logger.error('Error occurred', error);
        return {
          statusCode: 500,
          body: JSON.stringify('Internal Server Error')
        };
      }
    };

    function processData(event) {
      logger.debug('Processing data', event);
      // Simulated data processing logic
      return { message: 'Data processed successfully' };
    }
  

By following this comprehensive guide and utilizing the examples provided, you can effectively integrate lambda-logger-node into your AWS Lambda workflows, making debugging and monitoring much easier.

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