Best For
Network administrators or security professionals with an existing Graylog or Logstash GELF log pipeline who need a real-time visualization dashboard for traffic distribution. Ideal for NOC wall displays, security incident geographic analysis, and academic/lab network teaching demonstrations. Not suitable without existing GELF infrastructure or when historical query capabilities are required.
How I Actually Use It
As a real-time visualization frontend for a Graylog GELF pipeline. Integration is minimal—add a GELF Output in Graylog pointing to jt-gelflow's UDP port 12201, and traffic particle animations appear within 15 minutes. Switching between four modes is as simple as pressing number keys, making it perfect for continuous display on a large screen.
Where It Is Strong
- Four interactive visualization modes: Flow particles for real-time dynamics, 2D Mercator map for geographic distribution, 3D globe for worldwide perspective, Sankey diagram for flow hierarchy (external IP → country → protocol → port → internal IP)
- WebSocket 100ms broadcast + 5-second sliding window aggregation. It feels instant
- Connect to Graylog in ~15 minutes; frontend is pre-built, no Node installation needed
- Built by a Taiwanese developer (Jason Cheng), with bilingual Traditional Chinese and English interface
- Thoughtful UX: keyboard shortcuts (spacebar pause, number keys switch views), real-time search filtering, seven-segment display clock
- Apache 2.0 licensed, commercially friendly
Where It Fails
- Web UI has zero authentication. Exposing port 8099 publicly means completely open traffic monitoring and configuration modification. Production requires nginx + TLS + auth
- Pure real-time 5-second window; past events cannot be queried
- Linux systemd only, no macOS, Windows, or Docker support
- Requires upstream GeoIP injection; jt-gelflow does not perform GeoIP lookups itself
- Performance above 100K flows/second is unknown
- No test coverage, code quality relies on manual review
Pricing, Difficulty, and Risk
- Completely free, Apache 2.0 licensed
- Installation is fast (one-line script), but production deployment requires configuring a reverse proxy + authentication, and presupposes an existing GELF pipeline
- Main risk is the unauthenticated Web UI. No historical data means events can only be observed in real time. Small project (44 Stars)
Verdict
If you already have a GELF pipeline, jt-gelflow is a solid option for real-time traffic visualization. Four modes each serve distinct purposes, and a POC takes about 15 minutes. Good for NOC displays or security teaching. Zero authentication and no history are hard limitations though; production deployment requires a reverse proxy. Position it as a complementary visual layer alongside Grafana or Graylog Dashboard, not a replacement.