slf-debug

SLF driver that sends logs to debug.

Install

npm install slf slf-debug debug

Quick start

import debug from 'debug';
import { LoggerFactory } from 'slf';
import slfDebug from 'slf-debug';

debug.enable('api:*');
LoggerFactory.setFactory(slfDebug);

const log = LoggerFactory.getLogger('api:users');
log.info('User loaded: %s', '123');

Behavior

• Reuses one debug logger per SLF logger name.
• Prepends each message with ISO timestamp and uppercase level.
• If first param is a string, it is combined with the prefix.
• If params contain Error, stack/message is used for better readability.

Example output shape:

2026-04-27T09:30:00.000Z INFO User loaded: 123

Recommended namespaces

Use structured logger names so debug.enable() filters are useful:

• api:*
• worker:billing:*
• http:request