Built-in Sankey Chart Stays Blank Even with Minimal Dataset

[goodvibesonly]

1. My goal:

I’m trying to visualize stage-to-stage movements in a Sankey Chart using Retool’s built-in Sankey component.

2) The issue:

No matter what data I pass, the Sankey remains blank. Even a trivial two-link example won’t render any nodes or flows.

3) Steps I’ve taken to troubleshoot:

• Used a minimal dataset with no possibility of cycles, e.g.:

[
  { "source": "Discovery", "target": "Proposal", "value": 10 },
  { "source": "Proposal", "target": "Closed Won", "value": 5 }
]

• That still shows an empty chart area.
• Verified correct key names (source, target, value) in lowercase.
• Toggled “Allow duplicate nodes” in the Sankey settings.
• Removed custom tooltips (set Node tooltip to “Node label” or “Node label × Value”).
• Created a brand-new Sankey component in a fresh Retool page (no custom CSS or layout).
• Checked DevTools: no error messages about cycles or invalid data.
• Compared with Plotly Sankey: When I switch to a custom Plotly JSON chart, the same data does render a Sankey. So it’s specifically the built-in Retool Sankey that’s failing.

4) Additional info:

• Running Retool on [Cloud / Self-Hosted / Plan details].
• Attaching screenshots of the Sankey settings and the blank chart.
• Let me know if you need more logs or a shared Retool app link.

Any help or insight would be greatly appreciated. Thank you so much!

[MiguelOrtiz]

Hey @goodvibesonly, welcome to the forum!

So the sankey data source is expecting something like this:

[
  ["Discovery", "Proposal", 10 ],
  [ "Proposal", "Closed Won", 5 ]
]

Which will then render the data as:

When you select a point.

Hope this helps!