socket.io

4.8.4 · 25 Sep 2026MIT16.6M / weekRepository Homepage npm Atom feed

Same major only

1 release in betweenevery note read

Other targets from 3.1.2Clears its advisory4.6.2 Latest4.8.4

The note of 4.0.0 lists no breaking change or deprecation, which is rare for a major.

?
changes to make: 0
advisories fixed: 4
new: 1
fix

Security

1 advisory still affects 4.0.0

socket.io has an unhandled 'error' eventmoderate · GHSA-25hc-qcg6-38wj

Upgrading to 4.6.2 clears it.

Release by release

4.0.0
10 Mar 20214 new · 1 fix
- new
  Add some utility methods
- new
  Add support for typed events
- new
  Allow to exclude specific rooms when broadcasting
- new
  Allow to pass an array to io.to(...)
- fixed
  Make io.to(...) immutable

Upgrade to 4.0.0

npm install socket.io@4.0.0

What 4.0.0 needs

Reading 4.0.0's manifest…

Check against your package.json

Which of your other dependencies stand in the way of 4.0.0. Read once, not stored.

After upgrading

Run the type checker, the linter and the tests.
Build, and look for new deprecation warnings.
Update peer dependencies the new version asks for.
1 advisory still affects 4.0.0.