A MongoDB transport for winston.

Current version supports only mongodb driver version 3.x and newer and winston 3.x and newer. If you want to use winston-mongodb with mongodb version 1.4.x use winston-mongodb <1.x. For mongodb 2.x use winston-mongodb <3.x.

tldr;?: To break the winston codebase into small modules that work together.

The winston codebase has been growing significantly with contributions and other logging transports. This is awesome. However, taking a ton of additional dependencies just to do something simple like logging to the Console and a File is overkill.

const winston = require('winston');
// Requiring `winston-mongodb` will expose winston.transports.MongoDB`
require('winston-mongodb');

const log = winston.createLogger({
  level: 'info',
  transports: [
    // write errors to console too
    new winston.transports.Console({format: winston.format.simple(), level:'error'})
  ],
});

// logging to console so far
log.info('Connecting to database...');

const MongoClient = require('mongodb').MongoClient;
const url = "mongodb://localhost:27017/mydb";

const client = new MongoClient(url);
await client.connect();

const transportOptions = {
  db: await Promise.resolve(client),
  collection: 'log'
};

log.add(new winston.transports.MongoDB(transportOptions));

// following entry should appear in log collection and will contain
// metadata JSON-property containing url field
log.info('Connected to database.',{url});

The MongoDB transport takes the following options. Only option db is required:

Logging unhandled exceptions: For logging unhandled exceptions specify winston-mongodb as handleExceptions logger according to winston documentation.

Besides supporting the main options from winston, this transport supports the following extra options:

• includeIds: Whether the returned logs should include the _id attribute settled by mongodb, defaults to false.

  $ npm install winston
  $ npm install winston-mongodb