javascript
// Example using the Pino logging library with LogLayer
// You can also start out with a console logger and swap to another later!
import { LogLayer } from 'loglayer';
import { pino } from 'pino';
import { PinoTransport } from '@loglayer/transport-pino';
import { redactionPlugin } from '@loglayer/plugin-redaction';
const log = new LogLayer({
// Multiple loggers can also be used at the same time.
transport: new PinoTransport({
logger: pino()
}),
// Plugins modify log data before it's shipped to your logging library.
plugins: [
redactionPlugin({
paths: ['password'],
censor: '[REDACTED]',
}),
],
// Put context data in a specific field (default is flattened)
contextFieldName: 'context',
// Put metadata in a specific field (default is flattened)
metadataFieldName: 'metadata',
})
// persisted data that is always included in logs
log.withContext({
path: "/",
reqId: "1234"
})
log.withPrefix("[my-app]")
.withError(new Error('test'))
// data that is included for this log entry only
.withMetadata({ some: 'data', password: 'my-pass' })
// Non-object data only (numbers and strings only)
// this can be omitted to just log an object / error
// by using .errorOnly() / .metadataOnly() instead of withError() / withMetadata()
.info('my message')
json5
{
"level": 30,
"time": 1735857465669,
"msg": "[my-app] my message",
"context": {
"path": "/",
"reqId": "1234",
},
"metadata": {
"password": "[REDACTED]",
"some": "data",
},
"err":{
"type": "Error",
"message": "test",
"stack": "Error: test\n ..."
}
}