logger-middleware

Middleware for logging HTTP requests and responses for use with @remix-run/fetch-router.

Logs information about HTTP requests and responses with customizable formatting.

Installation

npm install @remix-run/logger-middleware

Usage

import { createRouter } from '@remix-run/fetch-router'
import { logger } from '@remix-run/logger-middleware'

let router = createRouter({
  middleware: [logger()],
})

// Logs: [19/Nov/2025:14:32:10 -0800] GET /users/123 200 1234

Custom Format

You can use the format option to customize the log format. The following tokens are available:

• %date - Date and time in Apache/nginx format (dd/Mon/yyyy:HH:mm:ss ±zzzz)
• %dateISO - Date and time in ISO format
• %duration - Request duration in milliseconds
• %contentLength - Response Content-Length header
• %contentType - Response Content-Type header
• %host - Request URL host
• %hostname - Request URL hostname
• %method - Request method
• %path - Request pathname + search
• %pathname - Request pathname
• %port - Request port
• %query - Request query string (search)
• %referer - Request Referer header
• %search - Request search string
• %status - Response status code
• %statusText - Response status text
• %url - Full request URL
• %userAgent - Request User-Agent header

let router = createRouter({
  middleware: [
    logger({
      format: '%method %path - %status (%duration ms)',
    }),
  ],
})
// Logs: GET /users/123 - 200 (42 ms)

For Apache-style combined log format, you can use the following format:

let router = createRouter({
  middleware: [
    logger({
      format: '%host - - [%date] "%method %path" %status %contentLength "%referer" "%userAgent"',
    }),
  ],
})

Custom Logger

You can use a custom logger to write logs to a file or other stream.

import { createWriteStream } from 'node:fs'

let logStream = createWriteStream('access.log', { flags: 'a' })

let router = createRouter({
  middleware: [
    logger({
      log(message) {
        logStream.write(message + '\n')
      },
    }),
  ],
})

Related Packages

• fetch-router - Router for the web Fetch API

License

See LICENSE