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To generate PNG charts from JSON data headlessly, you can build Vega-Lite specifications and render them via Sharp without requiring a browser. This allows automated chart creation for dashboards and reports on server environments like Fly.io or VPS.

Automating chart generation for reports is best handled by building Vega-Lite specifications from JSON data and rendering PNGs via Sharp. This approach runs completely headless without native Canvas or browser dependencies, fitting seamlessly into automated workflows.

Yes, the chart generation approach supports candlestick and heatmap visualizations, alongside line, bar, area, and pie/donut charts. It constructs Vega-Lite specifications to render these various chart types into publication-quality PNG outputs.

Yes, you can render Vega-Lite charts on a VPS without a browser by using Sharp to produce PNG outputs. This headless rendering method bypasses the need for native Canvas or browser environments while generating publication-quality visualizations.

You should avoid a browser-based approach for data-visualization when running headless on Fly.io or a VPS for automated reports. Instead, building Vega-Lite specifications and using Sharp to output PNGs provides the necessary chart generation without browser overhead.

To create a line chart from JSON data via the command line, execute the chart script with arguments specifying the chart type, JSON data array, and output filename, generating a PNG file directly from the provided data.