forked from arne/asdf-games
120 lines
3.0 KiB
Markdown
120 lines
3.0 KiB
Markdown
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# garnish
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[](http://github.com/badges/stability-badges)
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Prettifies [ndjson](http://ndjson.org/) or [bole](https://github.com/rvagg/bole) logs from [budo](https://github.com/mattdesl/budo), [wzrd](https://github.com/maxogden/wzrd/) and other tools.
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Example with [budo](https://github.com/mattdesl/budo), which uses this under the hood.
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<img src="http://i.imgur.com/Pvus8vy.png" width="75%" />
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## Install
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```sh
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npm install garnish [-g|--save-dev]
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```
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## Usage
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### CLI
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Pipe a ndjson emitter into `garnish` like so:
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```sh
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node app.js | garnish [opts]
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Options:
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--level, -l the minimum debug level, default 'debug'
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--name, -n the default app name
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```
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Where `level` can be `debug`, `info`, `warn`, `error`.
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### API
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#### `garnish([opt])`
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Returns a duplexer that parses input as ndjson, and writes a pretty-printed result. Options:
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- `level` (String)
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- the minimum log level to print (default `'debug'`)
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- the order is as follows: `debug`, `info`, `warn`, `error`
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- `name` (String)
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- the default name for your logger; a message's `name` field will not be printed when it matches this default name, to reduce redundant/obvious information in the logs.
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## format
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Typically, you would use [bole](https://github.com/rvagg/bole) or [ndjson](https://www.npmjs.com/package/ndjson) to write the content to garnish. You can also write ndjson to `stdout` like so:
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```js
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// a log message
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console.log({
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name: 'myApp',
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level: 'warn',
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message: 'not found'
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})
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// a typical server message
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console.log({
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name: 'myApp',
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type: 'generated',
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level: 'info',
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url: '/foo.png',
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statusCode: 200,
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contentLength: 12800, // in bytes
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elapsed: 120 // in milliseconds
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})
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```
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Currently garnish styles the following:
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- `level`
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- the log level e.g. `debug`, `info`, `warn`, `error` (default `debug`) - only shown if `message` is present
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- `name`
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- an optional event or application name. It's recommended to always have a name.
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- `message`
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- an event message.
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- `url`
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- a url (stripped to pathname), useful for router logging.
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- `statusCode`
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- an HTTP statusCode. Codes `>=400` are displayed in red.
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- `contentLength`
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- the response size; if a `number`, bytes are assumed
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- `elapsed`
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- time elapsed since the previous related event; if a `number`, milliseconds are assumed
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- `type`
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- the type of event logged
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- `colors`
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- an optional color mapping for custom styles
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You can use the `colors` field to override any of the default colors with a new [ANSI style](https://github.com/chalk/ansi-styles).
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For example, the following will print `elapsed` in yellow if it passes our threshold:
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```js
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function logTime (msg) {
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var now = Date.now()
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var time = now - lastTime
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lastTime = now
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console.log({
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name: 'app',
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message: msg,
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elapsed: time + ' ms',
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colors: {
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elapsed: time > 1000 ? 'yellow' : 'green'
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}
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})
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}
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```
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## See Also
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- [bistre](https://github.com/hughsk/bistre)
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## License
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MIT, see [LICENSE.md](http://github.com/mattdesl/garnish/blob/master/LICENSE.md) for details.
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