Package
eventsource
WhatWG/W3C compliant EventSource client for Node.js and browsers
Key numbers
As of 25 Sept 2026
- Weekly downloads
- 44.7m
- +297% over 12 months
- Gzip bundle size
- -
- No Bundlephobia data
- Dependencies
- 1
- Direct, from package.json
- Last release
- 3 days ago
- v5.1.2
- GitHub stars
- 1.2k
- 266 forks
- Open issues / PRs
- 1 / 0
- Contributors
- 58
- Commits, last 52 weeks
- 52
Downloads
Last week 2026-09-15 to 2026-09-21
44,668,168 downloads last week, 199,184,110 in the last month. The 12-month change of +297% compares the average of the last 4 weeks with the first 4 weeks of the series.
- Releases, last 12 months
- 650 in total
- Latest version
- 5.1.2, 21 Sept 20263 days ago
- First published
- 8 Feb 2012
- Last push to GitHub
- 21 Sept 20263 days before the snapshot
- Repository archived
- No
- Open issues
- 1
- Open pull requests
- 0
- Commits, last 52 weeks
- 52
- Dependents on npm
- 1,623
Major versions
- v5 first release 5.0.0, 10 Aug 2026
- v4 first release 4.0.0, 13 May 2025
- v3 first release 3.0.0, 7 Dec 2024
- v2 first release 2.0.0, 2 Mar 2022
- v1 first release 1.0.0, 17 Apr 2017
- v0 first release 0.0.1, 8 Feb 2012
Recent releases
| Version | Published |
|---|---|
| 5.1.2 | 21 Sept 2026 |
| 5.1.1 | 20 Aug 2026 |
| 5.1.0 | 14 Aug 2026 |
| 5.0.0 | 10 Aug 2026 |
| 4.1.1 | 4 Aug 2026 |
| 4.1.0 | 19 Nov 2025 |
| 4.0.0 | 13 May 2025 |
| 3.0.7 | 9 May 2025 |
| 3.0.6 | 27 Mar 2025 |
| 3.0.5 | 28 Jan 2025 |
| 3.0.4 | 28 Jan 2025 |
| 3.0.3 | 27 Jan 2025 |
| 3.0.2 | 13 Dec 2024 |
| 3.0.1 | 7 Dec 2024 |
- Module format
- ESM onlyFrom package.json type, main and exports fields
- TypeScript types
- Bundled
- Node.js engine range
- >=22.12.0
- Runtimes
- -
- Unpacked size (npm)
- 100 kB
- Dependencies (1)
eventsource-parser
npm install eventsourceCDN
jsDelivr: 839.6k requests in 30 days
- jsDelivr
https://cdn.jsdelivr.net/npm/eventsource@5.1.2/ - unpkg
https://unpkg.com/eventsource@5.1.2/ - esm.sh
https://esm.sh/eventsource@5.1.2
Indexability: Indexed.