The nodejs-logging's intro from louisblack

nodejs-logging's Introduction

Logging

There are 8 log levels: ALL, TRACE, DEBUG, INFO, WARN, ERROR, FATAL and OFF.
A level can be set via an environment variable LOG_LEVEL, the default isinfo.
There are 2 types of logging output which is set via an environment variable LOG_OUTPUT, the default issingle.
1. Production - a single line output - LOG_OUTPUT=single.
2. Development - a multi line output - LOG_OUTPUT=multi.
By default logging is turned off when running these unit tests.

Use

yarn add @hmcts/nodejs-logging

// Require it
const logging = require('nodejs-logging');

// Set this config only once
logging.config({ 
    microservice: 'your-service-name', 
    team: 'YOURTEAM'
    environment: 'some-environemnt'
});

// Get your logger
logger = logging.getLogger('app.js');

// Get logging
  logger.info({
    message: 'Yay, logging!'
  });

Optionally you can use the built in express.js access logger.

app.use(logging.express.accessLogger());

A typical HTTP 404 log error when encountering an error would look like the following.

{
  responseCode: 404,
  message: 'Not Found',
  fields: [],
  level: 'ERROR',
  environment: 'some-environemnt',
  hostname: 'My-MacBook-Pro.local',
  rootRequestId: '',
  requestId: '',
  originRequestId: '',
  type: 'nodejs',
  microservice: 'your-service-name',
  team: 'YOURTEAM',
  timestamp: '2017-01-27T11:27:23+00:00'
}