Workspace/Workflow check
FREE LOCAL TOOL
Flow, uninterrupted

The ComfyUI troubleshooting toolkit.
Diagnose. Fix. Verify.

Check workflow JSON for duplicate IDs and missing links, or inspect common ComfyUI error patterns. Free, in your browser.

Workflow inputUI + API JSON
Drop workflow JSON or a ComfyUI PNG

JSON/logs 2 MB · PNG 10 MB · Processed on your device

example-workflow.jsonJSON
LOAD EXAMPLE

No uploads. No account. No AI API.

Analysis overviewEXAMPLE RESULTS
2findings to review
UI workflow · Demo

Static checks only. Verify installed models, node definitions and behavior in ComfyUI.

Private by design

Your inputs stay in this browser.

Evidence over guesses

Each finding points to a specific detail.

A practical next step

Clear checks you can verify yourself.

Build your next graph

Workflow Studio — edit ComfyUI in your browser

Arrange nodes on a canvas, connect compatible sockets, edit prompts and export ComfyUI UI JSON. Start from text-to-image or image-to-image, or import an existing v0.4 workflow. AI can suggest prompts or review an error after you choose to send a summary to Cloudflare.

Open Workflow Studio ↗

No GPU or ComfyUI installation is required to edit. Running the exported workflow still requires a compatible ComfyUI environment and your own models.

Your troubleshooting toolkit

More free ComfyUI tools

JSON formatter

Validate syntax and make an export readable without changing its intended data.

Format JSON →

Compare workflows

Review added, removed and modified nodes between two exports.

Compare exports →

Redact error logs

Filter common sensitive patterns before you share an error excerpt.

Review a log →
Go beyond a static check

Need a human review of your workflow?

The browser checker stays free. For help with a specific workflow, request a manual review from Elmehdi. Send the relevant error, your ComfyUI version and a short description of what you expect the workflow to do. Remove API keys and private information first.

Free checker

Local JSON checks, known log patterns and a downloadable report. No signup or payment.

Check a workflow

Manual workflow review

A review of the agreed workflow and error, with written findings and practical next steps. Price and scope confirmed before payment.

Request a review ↗

Payment after agreement

First confirm that the request is within scope. Payment instructions follow the quote. No automatic subscription or guaranteed repair.

Never share account passwords or remote access credentials.

Already have an agreed quote? Pay with PayPal

Pay only after Elmehdi confirms the scope and price. Enter the exact agreed USD amount on PayPal. This is a payment for a manual service, not an automatic software upgrade. Review the recipient and total before completing checkout.

Recipient: elmehdi.chamit99@gmail.com. Payment is handled on PayPal; OnBeg does not collect card details or confirm payments automatically. Contact Elmehdi about the review after payment.

Check a ComfyUI workflow before troubleshooting a render

OnBeg checks the structure of exported ComfyUI workflow JSON. It helps you spot duplicate node IDs, connections that point to missing nodes, and invalid socket positions when the export includes socket definitions. The error log inspector looks for familiar patterns such as CUDA out of memory and disconnected WebSocket messages. Each result includes the detail that triggered it and a next step to verify in ComfyUI.

How to use the checker

  1. Export your workflow from ComfyUI. Standard UI workflow JSON and API prompt JSON are supported.
  2. Drop the JSON file here or paste its contents. For an error, select Error log and paste the relevant lines.
  3. Run the check, review each finding, and test any change in your own ComfyUI environment.

The tool does not run models, install custom nodes, repair ambiguous connections automatically, or confirm that a workflow will render. A clean structural report is a starting point, not proof of runtime compatibility.

ComfyUI troubleshooting guides

Frequently asked questions

Do I need to upload my workflow to a server?

No. The JSON and log analysis runs in your browser. OnBeg does not send the content you enter to an analysis server. Hosting and third-party font or script requests can still receive ordinary connection information; see our privacy page.

Does this check installed models or missing custom nodes?

No. An exported JSON cannot prove what is installed on your machine. The report lists model references and node types for you to compare with your ComfyUI environment.

Can this fix every ComfyUI error?

No. Static checks cover a limited set of structural problems and known log patterns. Runtime errors may depend on Python packages, custom node versions, drivers, model formats or available memory.

Is OnBeg affiliated with ComfyUI?

No. OnBeg is an independent tool by Elmehdi, the creator of FluxDraw. ComfyUI names are used to describe compatibility.