How to configure Winston to send logs to Datadog

To send logs from NodeJS to Datadog using Winston, you can follow these steps:

1. Install the Winston and Datadog packages:

npm install winston datadog

2. Create a logger object:

This object defines the options for the HTTP transport. The host property specifies the hostname of the Datadog intake server, the path property specifies the path to the API endpoint, the dd-api-key property specifies your Datadog API key, the ddsource property specifies the source of the logs, and the service property specifies the name of your application.

const logger = require('winston');
const httpTransportOptions = {
  host: 'http-intake.logs.datadoghq.com',
  path: '/api/v2/logs?dd-api-key=&ddsource=nodejs&service=',
  ssl: true,
};
const logger = logger.createLogger({
  level: 'info',
  exitOnError: false,
  format: winston.format.json(),
  transports: [
    new winston.transports.Http(httpTransportOptions),
  ],
});

Replace with your Datadog API key, and with the name of your application.

3. Use the logger object to log messages:

logger.info('This is an info message');
logger.error('This is an error message');

Your logs will now be sent to Datadog.

Here is a complete example of a NodeJS application that sends logs to Datadog using Winston:

const winston = require('winston');
const httpTransportOptions = {
  host: 'http-intake.logs.datadoghq.com',
  path: '/api/v2/logs?dd-api-key=&ddsource=nodejs&service=',
  ssl: true,
};
const logger = winston.createLogger({
  level: 'info',
  exitOnError: false,
  format: winston.format.json(),
  transports: [
    new winston.transports.Http(httpTransportOptions),
  ],
});

This line creates a logger object. The level property specifies the minimum level of severity for logs to be sent to Datadog, the exitOnError property specifies whether the application should exit if an error occurs while logging, the format property specifies the format of the logs, and the transports property specifies the transports that will be used to send logs to Datadog. In this case, the only transport is the HTTP transport.

function main() {
  logger.info('This is an info message');
  logger.error('This is an error message');
}

main();

This function is the main entry point for the application. It calls the logger.info() and logger.error() methods to log messages to Datadog.