A unified logging layer for TypeScript / JavaScript

Documentation • Getting Started • GitHub

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LogLayer provides a fluent, structured logging API that sits on top of your logging library of choice. Fan out logs to multiple destinations at the same time — start with console, then add Pino, Datadog, or any combination of transports without changing your application code.

import { LogLayer } from 'loglayer';
import { PinoTransport } from '@loglayer/transport-pino';
import { DatadogTransport } from '@loglayer/transport-datadog';
import pino from 'pino';

const log = new LogLayer({
  // Send logs to multiple destinations at the same time
  transport: [
    new PinoTransport({ logger: pino() }),
    new DatadogTransport({
      apiKey: process.env.DD_API_KEY,
      service: 'my-app',
    }),
  ],
});

log.withContext({ requestId: 'abc-123' })
   .withMetadata({ duration: 150 })
   .withError(new Error('Timeout'))
   .error('Request failed');

Highlights

• Bring your own logger — works with Pino, Winston, Bunyan, tslog, Consola, and more
• Multi-transport — send logs to multiple destinations simultaneously (e.g. Pino + Datadog)
• Cloud-native — transports for Datadog, AWS CloudWatch, Google Cloud, New Relic, Sentry, Axiom, Better Stack, and others
• Extensible — plugins for redaction, filtering, OpenTelemetry trace injection, and sprintf formatting
• Framework integrations — first-class support for Hono, Fastify, and ElysiaJS
• Multi-platform — runs on Node.js, Deno, Bun, and browsers
• Tiny footprint — 8kB gzipped core, most transports under 1kB
• Battle tested — in production for 4+ years at Airtop.ai

Ecosystem

	Packages
Logging Libraries	Pino, Winston, Bunyan, Consola, tslog, Log4js, Roarr, Signale, loglevel, LogTape, Tracer, Electron-log
Cloud Providers	Datadog, AWS CloudWatch, AWS Lambda Powertools, Google Cloud, New Relic, Sentry, Axiom, Better Stack, Dynatrace, Sumo Logic, Logflare, VictoriaLogs
Other Transports	HTTP, Log File Rotation, OpenTelemetry, Pretty Terminal, Simple Pretty Terminal
Plugins	Redaction, Filter, OpenTelemetry, Datadog APM Trace Injector, Sprintf
Integrations	Hono, Fastify, ElysiaJS
Mixins	Hot-Shots (StatsD), Datadog Metrics (HTTP)

Get Started

npm install loglayer

Read the documentation or jump straight to the getting started guide.

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_{Made with care by Theo Gravity. Logo by Akshaya Madhavan.}