Node.js

MaxListenersExceededWarning: Possible EventEmitter memory leak detected

MaxListenersExceededWarning

Too many listeners attached to an EventEmitter. Default limit is 10.

Common Causes

Adding listeners in a loop without removing
Re-registering on each request
Memory leak from accumulated listeners

Fixes

1. Increase limit (temporary)
```
emitter.setMaxListeners(20)
```
2. Remove listeners when done
```
emitter.once('event', handler)
```

3. Use single shared listener

// Avoid adding new listener per iteration

Still not fixed?

• Search the exact error message on Stack Overflow or GitHub Issues
• Check the official docs for the language or tool
• Ensure your versions (Node, Python, npm, Docker) are up to date
• Try in a minimal reproduction (new project, single file)

Related Errors

JavaScript Heap Out of Memory ERR_REQUIRE_ESM

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All Errors

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