JavaScript logging libraries

In JavaScript, logging is the logger class that provides logging functionality for the application. It can display errors, warnings, and debug messages. Here are the best JavaScript logging libraries for your toolkit to perform logging.  

For debugging the utility model: 

1. Consider using debug library. 
2. We should consider using one of the popular libraries in JavaScript called signals. 
3. For a lightweight and configuration-free output level, consider using the loglevel library. 

Webpack is more flexible than Browserify. It is because it uses a JavaScript config file to define bundling workflows. The debugging process is to find and fix errors or bugs in the code of any software. JavaScript allows us to use throw with any arguments. So our custom error levels classes do not need to inherit from the error log.  

We have identified libraries based on popularity, flexibility, and coverage across the tools. Let's look at each library in detail. The links below help to access package commands, installation notes, npm, and codesnippets.  

debug:  

• It is a JavaScript debugging utility modeled after Node.js core's debugging technique.  
• It works in Node.js and web browsers.  
• Exposes a function; pass this function the name of our module.  
• It will return a decorated version of the console error for us. It helps toggle the debug output for different parts of our module and the module as a whole.  

signale:  

• It is hackable and configurable to the core. We can use Signale for logging purposes like status and reporting. It helps in handling the output rendering process.  
• Delivers clean and beautiful standard output.  
• Secret and sensitive information filtering.  
• Overridable configuration per file and logger.  

node-bunyan:  

• It is a simple JSON logging library for node.js services.  
• It has wide platform support and good facilities for structured log messages.  
• We should structure server logs.  
• A Node.js module for logging in JSON and a Bunyan CLI tool to view those logs.  

loglevel:  

• Minimal, lightweight, simple logging for JavaScript.  
• Friends with level-based logging and filtering, with none of the console's downsides.  
• It is a barebone, reliable everyday logging library.  
• It does not let us reconfigure appends or add complex log filtering rules.  

hypercore:  

• It is a secure logging library, distributed append-only log.  
• Mainly built for sharing large datasets and streams of real-time logger data.  
• It aims to do one thing well - distributing a stream of data.  
• Uses signed Merkle trees to verify log integrity in real time.  

electron-log:  

• It is a simple logging module for our electron or NW.js application.  
• It has no dependencies and no complicated configuration.  
• We can use it in any node.js application without Electron.  

log-update:  

• Log by overwriting the last output in the terminal.  
• Useful for generating progress bars and animations.  
• One of the most important libraries for our node.js application.  
• Rendering plays a vital role in our application.  

FAQ:  

1. What is a logging library, and why should I use one?  

It is a simple JSON logging library for Node.js services.  

2. What are the best practices for using a logging library?  

• Define log levels.  
• Exclude sensitive information.  
• Timestamp.  
• Use structured logging.  
• Creating basic logs.  
• Test your logs.  
• Configure Winston with Morgan.  

3. How does the logging framework of Nodejs work?  

• LogLevel.  
• Error.  
• Debugging.  
• Information.  
• Stack trace.  
• Timestamp.  

4. How can we use Browserify to create a custom logging library?  

It allows developers to write and use Node.js-style modules that compile for the browser. Its features include a CLI for pretty printing and serializers. It supports many runtimes besides Node.js, like Webpack and Browserify.  

5. Where are server logs stored, and how can we access them?  

We can store logs in an available location, no matter the size of our JavaScript application. If not, we avoid having all the relevant information when something goes wrong.