Error Code Portal
Node.jsNode.jsError code

ERR_MULTIPLE_CALLBACK

multiple callback

What does this code mean?

Code ERR_MULTIPLE_CALLBACK · An issue reported by Node.js.

Official explanation · Original text

A callback was called more than once. A callback is almost always meant to only be called once as the query can either be fulfilled or rejected but not both at the same time. The latter would be possible by calling a callback more than once.

Troubleshooting and diagnostic links

First check that the document's product, version, and environment match your situation.

Source and terms of use

Errors | Node.js v26.13.1 Documentation ↗

Creator: Node.js contributors; Joyent, Inc. and other Node contributors
License: MIT License (Node.js documentation)
Checked on: 2026-11-12

Modifications: English prose extracted; whitespace normalized; Korean context and classified official links added. Python code examples not redistributed.

Source details · Original licenses and notices