@blacklane/kiev-js
v2.0.2
Published
A simple logging library to generate JSON formatted logging messages.
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37
Readme
Kiev-js
Kiev-js is a wrapper logging library around LogLevel implementing Blacklane logging standards.
Setup instructions
Requirements
Installation
npm install @blacklane/kiev-js
Usage
import {Logger, LoggerConfig, LogLevel} from '@blacklane/kiev-js'
const environment = process.env.NODE_ENV || 'development'
let loggerConfiguration: LoggerConfig = {
application: 'application-name',
environment: environment,
initializedFields: { foo: 'foo', bar: 'bar' }, // it is optional and will be added to all log entries
filterFields: ["password", "accessToken"] // it is optional and will filter the content of the field
}
// Default level is 'warn'
logger = new Logger(loggerConfiguration)
// This won't be logged due to the default level
logger.debug('Something happening here', { foo: 'bar' })
// Next line will be logged
// The payload will override any field defined in the constructor
logger.warn('WARN! Look at this', { foo: 'bar', password: "Hard_One" })
// => {"application":"application-name","environment":"development","level":"WARN", message: "WARN! Look at this", "timestamp":"2020-10-15T10:51:32.621Z", "foo": "bar", "bar": "bar", "password": "[FILTERED]}
// Setting logger to 'debug' level
logger.setLevel(LogLevel.DEBUG)
logger.debug('FooBar', { fizz: 'buzz' }) // Now it will be logged
// => {"application":"application-name","environment":"development","level":"DEBUG", message: "FooBar", "timestamp":"2020-10-15T10:51:32.621Z", "fizz": "buzz", "foo": "foo", "bar": "bar"}
// Create a new logger based on the current one
const newLogger = logger.extend({ tracking_id: "an tracking ID" })
// tracking_id will be present on all logs produced by this logger
newLogger.info('GET / - 200 OK')
// => {"application":"application-name","environment":"development","level":"INFO", message: "GET / - 200 OK", "timestamp":"2020-10-15T10:51:32.621Z", "foo": "foo", "bar": "bar", "tracking_id": "an tracking ID"}
Contributing
- Pull the code:
git clone [email protected]:blacklane/kiev-js.git
- Install dependencies
npm install
- Run tests:
npm test
- Create your feature branch (
git checkout -b my-new-feature
) - Commit your changes (
git commit -am 'Add some feature'
) - Push to the branch (
git push origin my-new-feature
) - Create a new Pull Request
Tests & Linter
- Run unit tests:
npm run test
- Run tests watch & coverage:
npm run test:cov
- Run Linter:
npm run lint