The vocabulary of the Chart Generator API

The 5 fields and concepts you'll meet in the response — defined in plain English, each with a real example value.

5 terms
Chart Types3

Bar Chart

A chart that uses rectangular bars to represent data values, with bar length proportional to the value.

Bar charts are ideal for comparing discrete categories. Vertical bars (column charts) work well for time series with few points. Horizontal bars are better for long category labels. Grouped bars compare multiple series; stacked bars show part-to-whole within categories.

ExampleSales by product: Product A (100), Product B (150), Product C (80)

Line Chart

A chart that displays data points connected by straight lines, typically used to show trends over time.

Line charts emphasize continuity and trends. They work best for time-series data where you want to show how values change. Multiple lines can compare different series over the same time period. The slope of the line communicates rate of change.

ExampleMonthly website visitors: Jan (1000), Feb (1200), Mar (1500), Apr (1400)

Pie Chart

A circular chart divided into slices to show numerical proportions, where each slice represents a percentage of the whole.

Pie charts show part-to-whole relationships where slices must sum to 100%. They work best with 5-7 categories maximum. Similar-sized slices are hard to compare visually. Consider doughnut charts (pie with hole) for a modern look or bar charts for better comparison.

ExampleMarket share: Company A (40%), Company B (35%), Others (25%)

Data Concepts1

Dataset

A collection of related data points that are plotted together on a chart, typically represented by a single color or line.

In our API, a dataset contains a "name" (label for the legend) and "values" (array of numbers). Multiple datasets on one chart enable comparison. Each dataset gets a unique auto-assigned color.

Example{"name": "Sales", "values": [100, 150, 200, 180]}

Output Formats1

SVG

Scalable Vector Graphics - an image format that uses mathematical formulas instead of pixels, allowing infinite scaling without quality loss.

SVG charts are ideal for web embedding and print. Unlike PNG/JPEG, SVG files can be scaled to any size without becoming blurry. They also support CSS styling and are typically smaller file sizes for simple graphics. Our API supports SVG output for premium users.

ExampleA 500x300 SVG chart can be displayed at 2000x1200 without quality loss

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