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pino-devtools

v2.8.0

Published

A transport for viewing the logs in your favorite browser devtools

Downloads

1,842

Readme

pino-devtools

GitHub Actions

A transport for viewing logs in your favorite browser devtools!

Installation

$ npm i pino-devtools

Usage

Given an application your-app.js that logs via pino, you would use pino-devtools like so:

$ node your-app.js | pino-devtools

pino-devtools automatically opens a page in your default browser (unless --no-open is supplied). Open the devtools and you will see the logs coming from your application into the console tab.

Options

  • --host 127.0.0.1: the host for the HTTP and web socket servers
  • --port 3010: the HTTP server port
  • --no-open: do not automatically open the page in the browser
  • --mode websocket: the server mode, more information in the next section
  • --tee: also send the logs to stdout

Note: the web socket port is port + 1.

Server modes

The server can be started in one of these two modes:

  • websocket: the default mode, which opens a new tab in your browser and forwards the logs via a websocket. There is nothing to configure in your application
  • buffer: a mode that does not open a new tab or use a websocket but uses a buffer to store all the logs and a client in your application to output those logs in the same console as your application

buffer mode

Use pino-devtools like so:

$ node your-app.js | pino-devtools --mode buffer

Update your application code to require the pino-devtools client and calls the fetchBufferedLogs() async function as early as possible:

// index.js
const { fetchBufferedLogs } = require('pino-devtools/src/client');

await fetchBufferedLogs();

License

pino-devtools is released under the Mozilla Public License Version 2.0. See the bundled LICENSE file for details.