Beautiful colors, clean formatting, blazing-fast output, and an extensible plugin system.
Buffered stdout in Node and batched console output in Web dramatically reduce logging overhead.
ANSI for terminals and CSS styles for browsers, with HEX, RGB, and named colors.
Clean stack traces, deduplication, and helpful formatting for Error objects.
Extend behavior with before/after hooks; ship Node and Web specific plugins.
Fully typed API with IntelliSense and zero runtime dependencies.
Node, Bun, Deno, and Web. Use 'spectrallogs' on server runtimes and 'spectrallogs/web' in browsers or via CDN (esm.sh).
Watch this short video to understand how Spectral Logs works in action:
SpectralLogs continues to outperform other popular loggers in both speed and memory efficiency, thanks to recent GC optimizations and warm-up handling.
Ops/sec (higher is better)
SpectralLogs | ████████████████████████████████ 1,187,120
Console | ███████████████████████ 675,645
Pino | ██████████████ 236,886
Log4js | ███████ 102,826
Winston | ████ 72,133Memory Usage (lower is better)
Console | 0.03 MB █
SpectralLogs | 0.19 MB █
Log4js | 0.34 MB ██
Pino | 0.46 MB ███
Winston | 5.55 MB ██████████████████████⚡ SpectralLogs is now ~43% faster than
console.logand up to 94% faster than Winston, while keeping memory usage extremely low at just 0.19 MB.
Simple spec.info() and spec.succes() usage:
// Node / Bun / Deno
import spec from 'spectrallogs';
spec.info('Node ready');
// Web
import web from 'spectrallogs/web';
web.success('Web ready');Web Bundlers and use of sink:
import spec, { SpectralLoggerWeb } from 'spectrallogs/web';
spec.success('SpectralLogs (Web) ready');
// Optional: DOM sink to avoid DevTools overhead
const sink = (args: any[]) => console.log(...args);
const logger = new SpectralLoggerWeb({ batching: true, sink });
logger.info('Batched via custom sink');
logger.flush();Simple example of the spec.configure() method:
// Node / Bun / Deno
import spec from 'spectrallogs';
spec.configure({
showTimestamp: true,
showLevel: true,
debugMode: false,
bufferWrites: true, // disable stdout/stderr buffering (Node)
timeFormat: 'iso', // 'iso' | 'unix' | 'locale'
colors: {
info: '#00bfff', success: '#00ff88', warn: '#ffaa00',
error: '#ff5555', log: '#dddddd', debug: '#cc66ff',
},
});SpectralLogs replaces console.log with a fast, beautiful, and flexible logger. It supports: