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:
| Option | Description |
|---|---|
| db | REQUIRED. MongoDB connection uri, pre-connected MongoClient object or promise which resolves to a pre-connected MongoClient object. |
| dbname | The database name to connect to, defaults to DB name based on connection URI if not provided, ignored if using a pre-connected connection. |
| options | MongoDB connection parameters. Defaults to {maxPoolSize: 2}). |
| collection | The name of the collection you want to store log messages in. Defaults to log. |
| level | Level of messages that this transport should log. Defaults to info. |
| silent | Boolean flag indicating whether to suppress output. Defaults to false. |
| storeHost | Boolean indicating if you want to store machine hostname in logs entry, if set to true it populates MongoDB entry with 'hostname' field, which stores os.hostname() value. |
| label | If set to true, then label attribute content will be stored in label field, if detected in meta-data. |
| name | Transport instance identifier. Useful if you need to create multiple MongoDB transports. |
| capped | In case this property is true, winston-mongodb will try to create new log collection as capped. Defaults to false. |
| cappedSize | Size of logs capped collection in bytes. Defaults to 10,000,000. |
| cappedMax | Size of logs capped collection in number of documents. |
| tryReconnect | Will try to reconnect to the database in case of fail during initialization. Works only if db is a string. Defaults to false. |
| decolorize | Will remove color attributes from the log entry message. Defaults to false. |
| leaveConnectionOpen | Will leave MongoClient connected after transport shuts down. |
| metaKey | Configure name of the field which is used to store metadata in the logged info object. Defaults to metadata to remain compatible with the metadata format |
| expireAfterSeconds | Seconds before the entry is removed. Works only if capped is not set. |
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:
_id attribute
settled by mongodb, defaults to false. $ npm install winston
$ npm install winston-mongodb