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# pino
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[](https://www.npmjs.com/package/pino)
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[](https://github.com/pinojs/pino/actions)
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[](https://snyk.io/test/github/pinojs/pino)
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[](https://coveralls.io/github/pinojs/pino?branch=master)
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[](https://standardjs.com/)
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[](https://definitelytyped.org)
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[Very low overhead](#low-overhead) Node.js logger.
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This README and linked documentation covers pino v6.x,
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you can find all related docs in: https://github.com/pinojs/pino/tree/v6.x.
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## Documentation
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* [Benchmarks ⇗](/docs/benchmarks.md)
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* [API ⇗](/docs/api.md)
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* [Browser API ⇗](/docs/browser.md)
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* [Redaction ⇗](/docs/redaction.md)
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* [Child Loggers ⇗](/docs/child-loggers.md)
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* [Transports ⇗](/docs/transports.md)
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* [Web Frameworks ⇗](/docs/web.md)
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* [Pretty Printing ⇗](/docs/pretty.md)
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* [Asynchronous Logging ⇗](/docs/asynchronous.md)
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* [Ecosystem ⇗](/docs/ecosystem.md)
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* [Legacy](/docs/legacy.md)
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* [Help ⇗](/docs/help.md)
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* [Long Term Support Policy ⇗](/docs/lts.md)
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## Install
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```
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$ npm install pino@six
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```
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## Usage
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```js
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const logger = require('pino')()
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logger.info('hello world')
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const child = logger.child({ a: 'property' })
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child.info('hello child!')
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```
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This produces:
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```
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{"level":30,"time":1531171074631,"msg":"hello world","pid":657,"hostname":"Davids-MBP-3.fritz.box"}
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{"level":30,"time":1531171082399,"msg":"hello child!","pid":657,"hostname":"Davids-MBP-3.fritz.box","a":"property"}
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```
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For using Pino with a web framework see:
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* [Pino with Fastify](docs/web.md#fastify)
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* [Pino with Express](docs/web.md#express)
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* [Pino with Hapi](docs/web.md#hapi)
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* [Pino with Restify](docs/web.md#restify)
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* [Pino with Koa](docs/web.md#koa)
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* [Pino with Node core `http`](docs/web.md#http)
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* [Pino with Nest](docs/web.md#nest)
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<a name="essentials"></a>
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## Essentials
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### Development Formatting
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The [`pino-pretty`](https://github.com/pinojs/pino-pretty) module can be used to
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format logs during development:
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### Transports & Log Processing
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Due to Node's single-threaded event-loop, it's highly recommended that sending,
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alert triggering, reformatting and all forms of log processing
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is conducted in a separate process. In Pino parlance we call all log processors
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"transports", and recommend that the transports be run as separate
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processes, piping the stdout of the application to the stdin of the transport.
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For more details see our [Transports⇗](docs/transports.md) document.
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### Low overhead
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Using minimum resources for logging is very important. Log messages
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tend to get added over time and this can lead to a throttling effect
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on applications – such as reduced requests per second.
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In many cases, Pino is over 5x faster than alternatives.
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See the [Benchmarks](docs/benchmarks.md) document for comparisons.
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<a name="team"></a>
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## The Team
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### Matteo Collina
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<https://github.com/pinojs>
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<https://www.npmjs.com/~matteo.collina>
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<https://twitter.com/matteocollina>
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### David Mark Clements
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<https://github.com/davidmarkclements>
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<https://www.npmjs.com/~davidmarkclements>
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<https://twitter.com/davidmarkclem>
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### James Sumners
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<https://github.com/jsumners>
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<https://www.npmjs.com/~jsumners>
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<https://twitter.com/jsumners79>
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### Thomas Watson Steen
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<https://github.com/watson>
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<https://www.npmjs.com/~watson>
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<https://twitter.com/wa7son>
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## Contributing
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Pino is an **OPEN Open Source Project**. This means that:
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> 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.
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See the [CONTRIBUTING.md](https://github.com/pinojs/pino/blob/master/CONTRIBUTING.md) file for more details.
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<a name="acknowledgements"></a>
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## Acknowledgements
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This project was kindly sponsored by [nearForm](https://nearform.com).
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Logo and identity designed by Cosmic Fox Design: https://www.behance.net/cosmicfox.
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## License
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Licensed under [MIT](./LICENSE).
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[elasticsearch]: https://www.elastic.co/products/elasticsearch
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[kibana]: https://www.elastic.co/products/kibana
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