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https://github.com/pinojs/pino

🌲 super fast, all natural json logger
https://github.com/pinojs/pino

fast json logger nodejs pino

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🌲 super fast, all natural json logger

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# pino

[![npm version](https://img.shields.io/npm/v/pino)](https://www.npmjs.com/package/pino)

[![Build Status](https://img.shields.io/github/actions/workflow/status/pinojs/pino/ci.yml)](https://github.com/pinojs/pino/actions)

[![js-standard-style](https://img.shields.io/badge/code%20style-standard-brightgreen.svg?style=flat)](https://standardjs.com/)



[Very low overhead](#low-overhead) Node.js logger.



## Documentation



* [Benchmarks ⇗](/docs/benchmarks.md)

* [API ⇗](/docs/api.md)

* [Browser API ⇗](/docs/browser.md)

* [Redaction ⇗](/docs/redaction.md)

* [Child Loggers ⇗](/docs/child-loggers.md)

* [Transports ⇗](/docs/transports.md)

* [Web Frameworks ⇗](/docs/web.md)

* [Pretty Printing ⇗](/docs/pretty.md)

* [Asynchronous Logging ⇗](/docs/asynchronous.md)

* [Ecosystem ⇗](/docs/ecosystem.md)

* [Help ⇗](/docs/help.md)

* [Long Term Support Policy ⇗](/docs/lts.md)



## Install



Using NPM:

```

$ npm install pino

```



Using YARN:

```

$ yarn add pino

```



If you would like to install pino v6, refer to https://github.com/pinojs/pino/tree/v6.x.



## Usage



```js

const logger = require('pino')()



logger.info('hello world')



const child = logger.child({ a: 'property' })

child.info('hello child!')

```



This produces:



```

{"level":30,"time":1531171074631,"msg":"hello world","pid":657,"hostname":"Davids-MBP-3.fritz.box"}

{"level":30,"time":1531171082399,"msg":"hello child!","pid":657,"hostname":"Davids-MBP-3.fritz.box","a":"property"}

```



For using Pino with a web framework see:



* [Pino with Fastify](docs/web.md#fastify)

* [Pino with Express](docs/web.md#express)

* [Pino with Hapi](docs/web.md#hapi)

* [Pino with Restify](docs/web.md#restify)

* [Pino with Koa](docs/web.md#koa)

* [Pino with Node core `http`](docs/web.md#http)

* [Pino with Nest](docs/web.md#nest)





## Essentials



### Development Formatting



The [`pino-pretty`](https://github.com/pinojs/pino-pretty) module can be used to

format logs during development:



![pretty demo](pretty-demo.png)



### Transports & Log Processing



Due to Node's single-threaded event-loop, it's highly recommended that sending,

alert triggering, reformatting, and all forms of log processing

are conducted in a separate process or thread.



In Pino terminology, we call all log processors "transports" and recommend that the

transports be run in a worker thread using our `pino.transport` API.



For more details see our [Transports⇗](docs/transports.md) document.



### Low overhead



Using minimum resources for logging is very important. Log messages

tend to get added over time and this can lead to a throttling effect

on applications – such as reduced requests per second.



In many cases, Pino is over 5x faster than alternatives.



See the [Benchmarks](docs/benchmarks.md) document for comparisons.



### Bundling support



Pino supports being bundled using tools like webpack or esbuild. 



See [Bundling](docs/bundling.md) document for more information.





## The Team



### Matteo Collina



### David Mark Clements



### James Sumners



### Thomas Watson Steen



## Contributing



Pino is an **OPEN Open Source Project**. This means that:



> Individuals making significant and valuable contributions are given commit-access to the project to contribute as they see fit. This project is more like an open wiki than a standard guarded open source project.



See the [CONTRIBUTING.md](https://github.com/pinojs/pino/blob/master/CONTRIBUTING.md) file for more details.





## Acknowledgments



This project was kindly sponsored by [nearForm](https://nearform.com).



Logo and identity designed by Cosmic Fox Design: https://www.behance.net/cosmicfox.



## License



Licensed under [MIT](./LICENSE).



[elasticsearch]: https://www.elastic.co/products/elasticsearch

[kibana]: https://www.elastic.co/products/kibana