Winston Timestamp Example

README.md

Winston Timestamp Example

See fecha for details of timestamp formats.

Output

$ node index.js simple a b c
info: arguments: [ 'a', 'b', 'c', [length]: 3 ] {"0":"a","1":"b","2":"c","timestamp":"2018-08-29T12:26:14.844Z"}

$ node index.js pretty a b c
{ '0': 'a',
  '1': 'b',
  '2': 'c',
  level: 'info',
  message: 'arguments: [ \'a\', \'b\', \'c\', [length]: 3 ]',
  timestamp: '2018-08-29T12:26:21.764Z',
  [Symbol(level)]: 'info',
  [Symbol(splat)]: [ [ 'a', 'b', 'c' ] ] }

index.js

const { createLogger, format, transports } = require('winston');

let test = {};

test.simple = (args) => {
  const logger = createLogger({
    format: format.combine(
      format.splat(),
      format.timestamp(),
      format.simple()
    ),
    transports: [new transports.Console()]
  });
  logger.info('arguments: %o', args);
};

test.pretty = (args) => {
  const logger = createLogger({
    format: format.combine(
      format.splat(),
      format.timestamp(),
      format.prettyPrint()
    ),
    transports: [new transports.Console()]
  });
  logger.info('arguments: %o', args);
};

if (require.main === module) {
  const name = process.argv[2];
  const args = process.argv.slice(3);
  if (!name) {
    test.simple();
  } else {
    test[name](args);
  }
}

package.json

{
  "name": "winston-timestamp-example",
  "version": "1.0.0",
  "description": "Winston Timestamp Example",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "[email protected]",
  "license": "ISC",
  "dependencies": {
    "winston": "^3.0.0"
  }
}