I need assistance in determining why my data is not being displayed on the chart. Here is my data object: [{"pop":100,"time":0},{"pop":100,"time":1},{"pop":100,"time":2},{"pop":100,"time":3},{"pop":93,"time":4},{"pop":0,"time":5},{"pop":0,"time":6}] Here is the screenshot of my chart settings […

The chart widget is unable to interpret your "time" values 1, 2, 3, 4, 5, 6 as valid timescale values. Change the x axis type to Linear.

Your 'time' data is not a timescale value. Set it to 'linear' and it works

Ok if my x-axis values were “Mon”, “Tues”, “Wed” would I then set it to Timescale or leave it Linear?

What happened when you tried it?

Set it as 'Categorical' Only use 'Timescale' if your x axis is in epoch times (Timestamps must be in milliseconds (ms)). X-Axis Type: Choose between a "Timescale" (for time-based data), "Linear" (for numerical data), or "Categorical" (for non-numeric data). You'll notice that some x-axis types are …

@Buckskin … thanks for verifying my understanding. Concerning the x-axis timestamp, if I want to format the field would I include something like this in payload: ui_control: { "xformat": "HH:MM" }

No, you have to define it in the chart node. The only dynamic for the chart node is 'Action' Have a look at Chart ui-chart | Node-RED Dashboard 2.0 for all the info on the chart node.

@Colin … well that explains the problem I’m having with my 2nd chart where I’m using the day of the week (i.e., Mon, Tue, Wed) as the x-axis value but it is not displaying them.

@Buckskin … where in the chart node can I set the x-axis format. I don’t see any field with that designation.

Unable to get data to display on DBv2 chart

Dashboard

Colin 29 August 2025 20:55 9

It seems that you cannot have 'categorical' x axis for a line chart, only timestamp or linear, unlike the old dashboard with did support this. See also Flowfuse Dashboard line chart using categorical x axis values, which I am hoping someone will produce an answer for.

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Unable to get data to display on DBv2 chart

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