Charts by Szum

io.szum/charts

Turns JSON configs into chart images through szum.io's rendering API. You pass a flat JSON object with marks (barY, line, dot, areaY, etc.), data arrays, and optional theme properties, and get back SVG or PNG output. The config format is deliberately simple with obvious field names, which makes it easy for Claude to generate correct charts without much prompting. Useful when you want visual output during analysis sessions instead of just describing trends in text. Supports composable marks so you can layer multiple chart types, and includes six preset themes (modern, editorial, dark, neon, pastel, technical) that you can customize. Works over streamable HTTP so charts render progressively as Claude generates the config.

last updated

Jun 2, 2026

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