Source map support

If you use BabelJS, Typescript or any other Javascript superset you may have noticed that when an exception occurs, the stacktrace is not meaningful at all. To get useful information you need to generate source map files.

Once these source map files are generated, PM2 will automatically detect them and will help you inspect errors.

Source map

Since version 1.0.2, PM2 embeds a mechanism to support javascript source maps.

PM2 automatically detects javascript source map files if you start app.js, it will expect app.js.map to exist as well.

If you have a different layout, you can force source map support by starting your application:

Via CLI:

pm2 start app.js --source-map-support

Or via JSON file:

module.exports = {
   name: 'babel-app',
   script: 'app.js',
   source_map_support: true
}

Inspect exceptions

Exceptions are logged into your application error log file.

To check your logs to detect exceptions, you can type:

pm2 logs main

Otherwise, use keymetrics.io to have a clean listing and notifications of new alerts.

Disable source map support

If you do not want PM2 to automatically support javascript source maps you can use the option --disable-source-map-support.

This is supported both via CLI and via a JSON file.