description: Browser/Node logger with levels, namespaces, timing helpers, and optional remote transport. package: logit category: logging keywords: [logging, console, structured, scoped, remote-logging, levels, namespaces] related: [fetchit, eventit, workit] exports: [createLogger]

@vielzeug/logit

Browser/Node logger with levels, namespaces, timing helpers, and optional remote transport.

Package: @vielzeug/logit  ·  Category: Logging

Key exports: createLogger

When to use: Browser/Node logger with levels, namespaces, timing helpers, and optional remote transport.

Related: @vielzeug/fetchit · @vielzeug/eventit · @vielzeug/workit

@vielzeug/logit is part of Vielzeug and ships as a zero-dependency TypeScript package with ESM+CJS output.

Installation

pnpm add @vielzeug/logit
npm install @vielzeug/logit
yarn add @vielzeug/logit

Quick Start

import { createLogger, Logit } from '@vielzeug/logit';

Logit.info({ port: 3000 }, 'Server started');
Logit.warn('High memory usage');
Logit.error(new Error('connection lost')); // auto-serializes Error
Logit.fatal('unrecoverable state');

const api = Logit.scope('api');
api.info({ method: 'GET', path: '/users' }, 'incoming request');

// pin fields to every call in a request context
const reqLog = api.withBindings({ requestId: 'abc-123' });
reqLog.info('processing');
reqLog.warn('slow query');

const log = createLogger({ logLevel: 'warn', namespace: 'Worker' });

if (log.enabled('debug')) {
  log.debug({ diagnostics: buildDiagnostics() }, 'diagnostics');
}

await log.time('sync-task', async () => {
  await runTask();
});

Documentation

• Overview
• Usage Guide
• API Reference
• Examples

License

MIT © Helmuth Saatkamp — part of the Vielzeug monorepo.