Im not sure, I asked Cursor IDE to fix it 
TL;DR: It seems you messed up the data points and the way the chart was configured.
PS, Claude is much better at coding in my opinion and this is the model I used in Cursor. Try using Claude next time youāre trying to produce some chart config, it might do a better job (https://claude.ai/new).
For the error you received it said this:
Main Issues Fixed:
-
Removed the wrapper chart object: Chart.js expects the configuration object directly, not wrapped in a chart property.
-
Added explicit yAxisID to the first dataset: Both datasets should specify which axis they belong to for clarity.
-
Added type: ālinearā to both y-axes: This is required for proper dual-axis functionality in Chart.js v3+.
-
Added position: āleftā to the primary y-axis: Makes the configuration explicit.
-
Added grid: { drawOnChartArea: false } to the secondary axis: This prevents grid lines from overlapping, making the chart cleaner.
Key improvements for dual-axis charts:
-
Clear axis association: Each dataset is explicitly tied to its axis
-
Proper axis positioning: Left and right axes are clearly defined
-
Clean grid display: Only the primary axis shows grid lines
-
Explicit axis types: Both axes are defined as linear scales
The configuration now follows the Chart.js line chart documentation standards and should render your dual-axis line chart correctly!
Then that produced a blank chart meaning there was some issue with the actual data points so it fixed it and said this:
Common causes of blank charts:
-
Missing display: true - Iāve added this explicitly to all scales
-
Invalid color formats - Iāve changed to proper RGB format
-
Missing x-axis configuration - Added explicit x-axis setup
-
Complex dual-axis setup - Simplified to single axis first
Key changes made:
-
Proper color formats: rgb(75, 192, 192) instead of āblueā
-
Added display: true to all scales
-
Added x-axis configuration
-
Simplified to single Y-axis initially
-
Added backgroundColor for better visibility
It then provided me with a duel axis example I hace not tried but here it is:
return {
chart: {
type: "line",
data: {
labels: ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"],
datasets: [
{
label: "Count",
data: [10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120],
borderColor: "rgb(75, 192, 192)",
backgroundColor: "rgba(75, 192, 192, 0.2)",
fill: false,
yAxisID: "y"
},
{
label: "Severity",
data: [100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210],
borderColor: "rgb(255, 99, 132)",
backgroundColor: "rgba(255, 99, 132, 0.2)",
fill: false,
yAxisID: "y1"
}
]
},
options: {
responsive: true,
interaction: {
mode: 'index',
intersect: false,
},
plugins: {
title: {
display: true,
text: "Test Dual-Axis"
},
legend: {
display: true
}
},
scales: {
x: {
display: true,
title: {
display: true,
text: 'Month'
}
},
y: {
type: 'linear',
display: true,
position: 'left',
beginAtZero: true,
title: {
display: true,
text: "Count"
}
},
y1: {
type: 'linear',
display: true,
position: 'right',
beginAtZero: true,
title: {
display: true,
text: "Severity"
},
grid: {
drawOnChartArea: false
}
}
}
}
}
};
