Problem

The /v2/customnode/import_fail_info_bulk endpoint was throwing a JSON serialization error:

[ComfyUI-Manager] Error processing bulk import fail info: Object of type ImportFailInfoItem is not JSON serializable

Root Cause

The error occurred due to a mismatch between the internal data structure and the API specification:

1. Internal data structure (cm_global.error_dict):

   {
       'name': 'node-name',
       'path': '/path/to/node',
       'msg': 'error message'
   }

2. API spec expects (ImportFailInfoItem):

   {
       'error': 'error string',
       'traceback': 'traceback string'
   }

3. The code was trying to serialize the Pydantic model ImportFailInfoBulkResponse which contained incompatible data structures, causing the serialization failure.

Solution

• Transform the data from cm_global.error_dict format to match the API specification
• Map msg field to error field
• Add empty traceback field when not present
• Remove Pydantic model serialization and return plain dict directly as JSON

Changes Made

1. Added data transformation in the bulk endpoint to convert error dict format:

   results[cnr_id] = {
       'error': info.get('msg', ''),
       'traceback': info.get('traceback', '')
   }

2. Removed problematic Pydantic model serialization:

   • Before: return web.json_response(response_data.root)
   • After: return web.json_response(results, content_type="application/json")

Testing

Tested with the following curl command and confirmed it returns proper JSON response without errors:

curl 'http://localhost:8188/api/v2/customnode/import_fail_info_bulk' \
  -H 'Content-Type: application/json' \
  --data-raw '{"cnr_ids":["comfyui-manager","teacache","comfyui-gguf"]}'

Impact

• Fixes the 500 Internal Server Error when calling the bulk import fail info endpoint
• Ensures consistent API response format across single and bulk endpoints
• Maintains backward compatibility with existing API contracts