I'm using the module node-red-contrib-chart-image from @gemini86 . The charts are rendered correctly except for any text (scales, data labels, title, etc). Instead, rectangular symbols are show. This seems to indicate that a font is missing. I've tried using different font families in the chart opti…

Welcome to the forum @bdkautzman Are you using node-red-contrib-chart-image or @gemini86 /node-red-contrib-chart-image. Check in Manage Palette to find out. According the readme the original one has been superseded by the latter.

Hello Collin, thank you for the welcome. I am using @gemini86 /node-red-contrib-chart-image.

So is it this issue you are seeing? Fonts missing · Issue #7 · gemini86/node-red-contrib-chart-image · GitHub

I think you will have to find out how to get the fonts installed on your system. Or possibly contact the node's author and ask if there is a way to specify a basic font.

@gemini86 Any feedback on this topic?

Hello, This seems to be limitation of chartjs-node-canvas, or at least node-canvas in general. Your browser is able to pull in many fonts that are not on your system, but canvas is using a headless renderer which is dependent on system fonts being installed. When I can find time I will work to see…

Ahh, I see. The headless rendering was the piece I was missing. That makes complete sense now why chart.js works without issue. I was hoping this was something simple that I was doing incorrectly, but it sounds like the environment I have Node-RED deployed in will cause more issues that I anticipate…

[image] bdkautzman: Unfortunately I'm too new for attachments, so I will have to paste the json below. That is the recommended way of posting flows unless they are very large :slight_smile: It makes it very easy to copy to clipboard and Import into node red.

oh, gotcha... those are not open fonts, they're commercial. Not likely to find them on any embedded system. What's weird is that it's not resorting to a fallback. So to make sure I'm clearly understanding your issue; using just the node with supplied examples on an embedded system, you're not able …

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@gemini86/node-red-contrib-chart-image issue with font

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bdkautzman 3 March 2026 21:32 5

Yes, or this one is the same as well.

Topic		Replies	Views
Chart-image font style General chart	4	136	5 March 2024
Just squares in "chart-image" .png General	5	209	11 May 2023
Chartjs-label - text are only empty boxes General	1	250	20 January 2022
[SOLVED] Using node-red-contrib-chart-image General	9	3542	5 November 2020
[Announce] node-red-contrib-chart-image Share Your Nodes	9	1539	2 August 2020

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@gemini86/node-red-contrib-chart-image issue with font

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