Question 1

How do I install and use loglevel in Node.js?

Accepted Answer

Install via npm with 'npm install loglevel', then require it in your code. It works out of the box with CommonJS modules, letting you call methods like log.warn() directly.

Question 2

What's the difference between loglevel and console.log?

Accepted Answer

loglevel adds level-based logging (trace, debug, info, warn, error) and filtering, while console.log is basic. loglevel also ensures reliability across environments, with fallbacks if console is missing.

Question 3

Can I send logs to a server with loglevel?

Accepted Answer

Not natively; you need a plugin like loglevel-plugin-remote. The core library focuses on console logging, but plugins can extend functionality for remote shipping or other custom needs.

Question 4

How to change the log level dynamically in production?

Accepted Answer

Use log.setLevel('error') to restrict logs, or call log.enableAll() in the browser console to temporarily enable all levels for debugging, with settings persisted via localStorage.

Question 5

Does loglevel work in older browsers like Internet Explorer?

Accepted Answer

Yes, it's designed for compatibility with IE8 and above, using fallbacks to handle missing console objects and automatically enabling logging when the developer tools open.

Question 6

How to create separate loggers for different modules in my app?

Accepted Answer

Use log.getLogger('moduleName') to create named loggers with independent level controls, ideal for large applications where you want granular logging per module.

Question 7

loglevel or winston for Node.js logging?

Accepted Answer

loglevel is minimal and great for simple, cross-environment logging, while winston offers more features like transports and formats out of the box, at the cost of larger size and complexity.

loglevel

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