Histogram of 40 API response times in milliseconds: 87, 91, 155, 182, 169, 99, 116, 114, 88, 193, 154, 208, 94, 132, 94, 144, 163, 112, 171, 269, 80, 122, 165, 200, 143, 90, 107, 196, 121, 203, 119, 161, 104, 217, 119, 117, 111, 181, 72, 115. x axis: response time (ms), y axis: requests.
Forma Visuals · Chart your data · Examples
Response time histogram in Chart.js
The shape of your latency, not just its average: how many requests were fast, and how long the slow tail runs.
For developers · Chart.js
Try it in the consoleOpen the Chart.js editor
The playground allows illustrative values: any number your request does not give, Forma writes, and the answer says generated. Over the API and MCP, that request is refused unless it sets allow_generated_data.
01 The chart
Drawn from the code that came back.
valid · chart@cb3749b2 · 1 credit · 2026-10-09
Sent with the API's default setting, under which a chart is drawn only from values the request gives.
02 The request
In plain words, with its values.
03 What came back
A Chart.js config.
Indented for reading.
{
"type": "bar",
"data": {
"labels": [
"[60, 80)",
"[80, 100)",
"[100, 120)",
"[120, 140)",
"[140, 160)",
"[160, 180)",
"[180, 200)",
"[200, 220)",
"[220, 240)",
"[240, 260)",
"[260, 280)"
],
"datasets": [
{
"type": "bar",
"data": [
1,
8,
10,
3,
4,
5,
4,
4,
null,
null,
1
],
"backgroundColor": "#4c78a8",
"borderColor": "#4c78a8"
}
]
},
"options": {
"plugins": {
"title": {
"display": true,
"text": "Histogram of API Response Times"
},
"legend": {
"display": false
}
},
"scales": {
"x": {
"type": "category",
"title": {
"display": true,
"text": "response time (ms)"
}
},
"y": {
"type": "linear",
"title": {
"display": true,
"text": "requests"
},
"beginAtZero": true
}
}
}
}04 When to use it
Where this chart helps.
- A distribution of one measure, such as response times or payload sizes.
- The number of bins changes the picture: try two before you settle on one, and look at the axis.
- The counts per bin are computed from your timings, so they are not compared with the request; the timings are.