NodeJS : How to debug “EventEmitter memory leak detected. 11 listeners added”

Question

How can I debug my application which throw this error:

(node) warning: possible EventEmitter memory leak detected. 11 listeners added. Use emitter.setMaxList         


        

Answer 1

This warning will be thrown if you register for a particular event of a same object more than 11 times.

Check if you are having 'on' call for particualr event in a function which you are calling frequently, this leads to registering for an event multiple times.

This link helped me to understand this.

Answer 2

Since node 6 you should use node --trace-warnings: https://nodejs.org/api/cli.html#cli_trace_warnings