How to Fix Confluence Draw.io Diagram Not Displaying

In this tutorial, you'll learn about How to Fix Confluence Draw.io Diagram Not Displaying. We cover key concepts, practical examples, and best practices to help you understand and apply this topic effectively.

A draw.io diagram embedded in Confluence displays as a broken image or white box. The draw.io plugin, attachment path, or browser cache is the cause.

The Wrong Way

// Deleting and re-uploading the same .drawio file
// This creates a new attachment but does not fix the rendering

If the plugin is the issue, re-uploading does not help. The diagram is still rendered by the same broken plugin.

The Right Way

Step 1: Check the draw.io plugin status

# Confluence Admin → Manage Apps → draw.io
# Check:
# - Is the plugin enabled?
# - Is there an update available?
# - Is the license valid? (if using paid version)

Step 2: Reload the diagram

# Click the white box → "Reload" icon (circular arrow)
# Or open the diagram → click "Save" without changes
# This re-renders the SVG preview

Step 3: Update the diagram attachment

# Open the Confluence page → click the diagram → "Edit diagram"
# Make a minor change (add a space, save)
# This updates the attachment version and re-renders it

Step 4: Check browser console for errors

// F12 → Console
// If you see:
// - net::ERR_BLOCKED_BY_CLIENT → disable ad blocker
// - Failed to load 'https://embed.diagrams.net' → network issue

draw.io diagrams load from embed.diagrams.net — ensure this is not blocked.

draw.io diagram renders inline — editable with double-click, updates saved to Confluence attachment.

Prevention

• Keep the draw.io for Confluence plugin updated to the latest version.
• If diagrams fail after a Confluence upgrade, re-save each diagram to trigger re-render.
• The plugin-based rendering is similar to Doda Browser's extension architecture — each embedded object needs its runtime to be available and current.

Common Mistakes with drawio diagram

1. Using head and tail instead of pattern matching, causing runtime errors on empty lists
2. Forgetting that lazy evaluation defers computation until the value is forced, causing space leaks with unevaluated thunks
3. Using return to exit a function early instead of wrapping a pure value in the monad

These mistakes appear frequently in real-world CONFLUENCE code. DodaTech's contributors have identified these patterns through analysis of open-source projects and production systems.

Practice Exercise

Write a pure function that safely divides two integers using Maybe, then test it with edge cases like division by zero and negative numbers.

This exercise reinforces the concepts covered in this guide. Try implementing it before checking online solutions.

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