tslog Transport Browser Server Deno Bun

tslog is a powerful TypeScript logging library that provides beautiful logging with full TypeScript support.

Transport Source

Installation

Install the required packages:

npm

npm i loglayer @loglayer/transport-tslog tslog

pnpm

pnpm add loglayer @loglayer/transport-tslog tslog

yarn

yarn add loglayer @loglayer/transport-tslog tslog

Setup

import { Logger } from "tslog"
import { LogLayer } from 'loglayer'
import { TsLogTransport } from "@loglayer/transport-tslog"

const tslog = new Logger()

const log = new LogLayer({
  transport: new TsLogTransport({
    logger: tslog
  })
})

log.info("Hello from tslog transport!")

2025-10-07 04:01:14.302 INFO    logger.ts:15    Hello from tslog transport!

Callsite information

Because tslog is being used as part of LogLayer, LogLayer modifies the tslog instance's private property stackDepthLevel to a value of 9 so tslog can output the proper filename in the log output (as in the example above, it shows logger.ts:15 instead of something like LogLayer.ts:123).

This is also exposed as an optional configuration parameter in the transport if you need to modify it.

Configuration Options

Required Parameters

Name	Type	Description
logger	Logger<any>	The tslog Logger instance to use for logging.

Optional Parameters

Name	Type	Default	Description
stackDepthLevel	number	9	The stack depth level to use for logging. This is useful for getting accurate file and line number information in the logs. You may need to adjust this value based on how many layers of abstraction are between your logging calls and the transport.

Log Level Mapping

LogLayer	tslog
trace	trace
debug	debug
info	info
warn	warn
error	error
fatal	fatal

Changelog

View the changelog here.