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iTerm2 expvar/JSON monitoring tool
| Date | Stars |
|---|---|
| 2026-07-24 | 1179 |
| 2026-07-25 | 1179 |
| 2026-07-28 | 1179 |
| 2026-07-30 | 1179 |
| 2026-08-06 | 1179 |
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Momentum
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growth rate 0.00%/day
# jplot
[](https://raw.githubusercontent.com/rs/jplot/master/LICENSE)
Jplot tracks expvar-like (JSON) metrics and plot their evolution over time right into your iTerm2, Kitty terminal, or terminals with DRCS Sixel Graphics support.
Above capture is jplot monitoring a Go service's [expvar](https://golang.org/pkg/expvar/):
```
jplot --url http://:8080/debug/vars \
memstats.HeapSys+memstats.HeapAlloc+memstats.HeapIdle+marker,counter:memstats.NumGC \
counter:memstats.TotalAlloc \
memstats.HeapObjects \
memstats.StackSys+memstats.StackInuse
```
By default, jplot uses the full size of the terminal, but it is possible to limit the render to a few rows:
## Install
Using [homebrew](http://brew.sh/):
```
brew install rs/tap/jplot
```
From source:
```
go install github.com/rs/jplot@latest
```
This tool works with [iTerm2](https://www.iterm2.com), [Kitty](https://sw.kovidgoyal.net/kitty/), [Warp](https://www.warp.dev/), or terminals that support DRCS Sixel Graphics.
## Usage
Given the following JSON output:
```
{
"mem": {
"Heap": 1234,
"Sys": 4321,
"Stack": 203
},
"cpu": {
"STime": 123,
"UTime":1234
},
"Threads": 2
}
```
You can graph the number of thread over time:
```
jplot --url http://:8080/debug/vars Threads
```
Or create a graph with both Utime and Stime growth rate on the same axis by using `+` between two field paths:
```
jplot --url http://:8080/debug/vars counter:cpu.STime+counter:cpu.UTime
```
Note: the `counter:` prefix instructs jplot to compute the difference between the values instead of showing their absolute value.
Or create several graphs by providing groups of fields as separate arguments; each argument creates a new graph:
```
jplot --url http://:8080/debug/vars mem.Heap+mem.Sys+mem.Stack counter:cpu.STime+cpu.UTime Threads
```
### Spec Syntax
Each positional arguments given to jplot create a stacked graph with the specified values. To reference the values, use [gojq](https://github.com/elgs/gojq) JSON query syntax. Several value paths can be referenced for the same graph by using the `+` character to separate them.
In addition, each value path can be prefixed with options separated from the path by a column. Several options can be used for the same command by separating them with a comma like so: `option1,option2:value.path`.
Supported options are:
* `counter`: Computes the difference with the last value. The value must increase monotonically.
* `marker`: When the value is none-zero, a vertical line is drawn.
## Recipes
### Memstats
Here is an example command to graph a Go program memstats:
```
jplot --url http://:8080/debug/vars \
memstats.HeapSys+memstats.HeapAlloc+memstats.HeapIdle+marker,counter:memstats.NumGC \
counter:memstats.TotalAlloc \
memstats.HeapObjects \
memstats.StackSys+memstats.StackInuse
```
### Vegeta
With the help of [jaggr](https://github.com/rs/jaggr) can be used to integrate [vegeta](https://github.com/tsenart/vegeta) with jplot as follow:
```
echo 'GET http://localhost:8080' | \
vegeta attack -rate 5000 -workers 100 -duration 10m | vegeta dump | \
jaggr @count=rps \
hist\[100,200,300,400,500\]:code \
p25,p50,p95:latency \
sum:bytes_in \
sum:bytes_out | \
jplot rps+code.hist.100+code.hist.200+code.hist.300+code.hist.400+code.hist.500 \
latency.p95+latency.p50+latency.p25 \
bytes_in.sum+bytes_out.sum
```
### Supported Terminals
* [xterm](http://invisible-island.net/xterm/)
* [iTerm2](https://www.iterm2.com/) on OSX
* [Kitty](https://sw.kovidgoyal.net/kitty/) on Linux/macOS/Windows
* [Warp](https://www.warp.dev/) on Linux/macOS/Windows
* [mintty](https://mintty.github.io/) on UNIX OSs via SSH
* [mExcerpt of 4,342 characters
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Would you bet a product on this? Bounded 0–100 and slow moving.
matched fp:9225fdcc5f0fff40, topic:monitoring