engine.io
npmactive
engine.io last released 6.6.11 on 2026-09-24. Its latest version requires Node.js >=10.2.0.
Facts
- Latest release
- 6.6.11, (1 month ago)
- First published
- (14 years ago)
- Releases in the last 12 months
- 7
- Median days between releases
- 48
- Median days between major versions
- 412
- Monthly downloads
- 74,008,108
- License
- MIT
- Repository
- github.com/socketio/socket.io
- Source
- registry.npmjs.org (checked 2026-10-19)
Major versions
7 major versions have been published.
| Major | First version | First released | Latest version | Latest released |
|---|---|---|---|---|
| 6 | 6.0.0 | 2021-10-08 | 6.6.11 | 2026-09-24 |
| 5 | 5.0.0 | 2021-03-10 | 5.2.1 | 2022-01-11 |
| 4 | 4.0.0 | 2020-09-10 | 4.1.2 | 2022-01-11 |
| 3 | 3.0.0 | 2017-04-05 | 3.6.2 | 2024-06-18 |
| 2 | 2.0.0 | 2017-01-22 | 2.1.1 | 2017-03-22 |
| 1 | 1.0.0 | 2014-03-06 | 1.8.5 | 2017-12-27 |
| 0 | 0.1.0 | 2012-07-03 | 0.9.0 | 2014-02-09 |
Runtime requirements
The latest version of engine.io declares these runtime constraints.
| Runtime | Constraint | Minimum version | Since version | Since |
|---|---|---|---|---|
| Node.js | >=10.2.0 | 10.2.0 | 6.5.2 | 2023-08-02 |
Supported runtimes
The latest version of engine.io runs on 16 tracked runtime releases.
| Runtime | Cycle | Released | End of life | LTS |
|---|---|---|---|---|
| Node.js | 26 | 2026-05-05 | 2029-04-30 | yes |
| Node.js | 25 | 2025-10-15 | 2026-06-01 | |
| Node.js | 24 | 2025-05-06 | 2028-04-30 | yes |
| Node.js | 23 | 2024-10-16 | 2025-06-01 | |
| Node.js | 22 | 2024-04-24 | 2027-04-30 | yes |
| Node.js | 21 | 2023-10-17 | 2024-06-01 | |
| Node.js | 20 | 2023-04-18 | 2026-04-30 | yes |
| Node.js | 19 | 2022-10-18 | 2023-06-01 | |
| Node.js | 18 | 2022-04-19 | 2025-04-30 | yes |
| Node.js | 17 | 2021-10-19 | 2022-06-01 | |
| Node.js | 16 | 2021-04-20 | 2023-09-11 | yes |
| Node.js | 15 | 2020-10-20 | 2021-06-01 | |
| Node.js | 14 | 2020-04-21 | 2023-04-30 | yes |
| Node.js | 13 | 2019-10-22 | 2020-06-01 | |
| Node.js | 12 | 2019-04-23 | 2022-04-30 | yes |
| Node.js | 11 | 2018-10-23 | 2019-06-30 |
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