To understand how a line chart is constructed in Chart.js, examine the configuration closely. The type property is set to "line", which determines the chart style. The data object contains two main parts: labels and datasets.

The labels array defines the categories along the x-axis—here, months of the year. The datasets array holds the data series you want to plot. Each dataset object includes a label for the legend, a data array for the y-values, and styling options such as borderColor, backgroundColor, tension (which controls line smoothness), and fill (to shade the area under the line). You can use pointRadius to make data points more visible.

The options object allows you to customize the chart’s appearance and behavior. Under plugins, the legend can be shown or hidden and positioned as needed. The scales section lets you configure the axes. For the x-axis, you can set a title to describe what the labels represent. For the y-axis, you can also add a title and use beginAtZero: true to ensure the scale starts at zero, which helps accurately reflect changes over time.

This setup makes it easy to visualize how a value, such as website visitors, changes from month to month. Line charts are especially effective for showing trends, patterns, or fluctuations across a continuous interval or time sequence.