dify - 💡(How to fix) Fix Object of type File is not JSON serializable [2 comments, 3 participants]

When I use an agent to call a workflow tool (publishing the workflow as a tool) with an input parameter of files in a Chat-flow, it reports an error: Object of type File is not JSON serializable

TL;DR

The issue can be fixed by ensuring that the File object is properly serialized to JSON before passing it as an input parameter to the workflow tool.

Guidance

• Verify that the File object is being converted to a JSON-serializable format, such as a base64-encoded string or a JSON object with file metadata.
• Check the documentation for the workflow tool to see if it supports file inputs and if there are any specific requirements for serializing file objects.
• Consider using a library or utility function to handle file serialization, such as converting the file to a byte array or a JSON object with file properties.
• Review the error message and stack trace to determine where the serialization error is occurring and adjust the code accordingly.

Example

import json
import base64

# Assuming 'file' is the File object
file_bytes = file.read()
file_json = {'filename': file.name, 'content': base64.b64encode(file_bytes).decode('utf-8')}

Notes

The exact solution will depend on the specific requirements of the workflow tool and the format of the File object. Additional debugging may be necessary to determine the root cause of the serialization error.

Recommendation

Apply workaround: Modify the code to properly serialize the File object to JSON before passing it as an input parameter to the workflow tool. This will likely involve converting the file to a JSON-serializable format, such as a base64-encoded string or a JSON object with file metadata.