This tiddlywiki tiddler raises errors when you try to convert it

[furicle]

I have a large, old tiddlywiki set up I'm trying to convert to markdown. jimmy stops while trying to convert it. I've narrowed it down to a specific entry.

jimmy.log

daniel-spurious-alerts.json

Windows 10, ran from Powershell via

.\jimmy-windows.exe cli --format tiddlywiki --output-folder tiddlers --log-file jimmy.log --stdout-log-level DEBUG .\daniel-spurious-alerts.json

Traceback (most recent call last):
  File "jimmy_cli.py", line 179, in <module>
  File "jimmy_cli.py", line 175, in main
  File "jimmy\main.py", line 122, in run_conversion
  File "jimmy\main.py", line 86, in convert_all_inputs
  File "jimmy\converter.py", line 75, in convert_multiple
  File "jimmy\formats\tiddlywiki.py", line 337, in convert
  File "jimmy\formats\tiddlywiki.py", line 218, in convert_json
  File "jimmy\common.py", line 179, in write_base64
  File "base64.py", line 85, in b64decode
binascii.Error: Invalid base64-encoded string: number of data characters (45) cannot be 1 more than a multiple of 4
[PYI-28380:ERROR] Failed to execute script 'jimmy_cli' due to unhandled exception!

Let me know if more data is required to reproduce on your end.

[marph91]

Thanks for the report!

I made the conversion a bit more robust. It will skip this tiddler, but continue with other tiddlers. This change will be in the next release (edit: 1.1.6).

For this specific tiddler: It fails, because the mime type is image/png, but the text is a normal string. Expected would be the image as base64 encoded string (something like UG9cms=). Could you describe how this note looks in Tiddlywiki or even send a screenshot? When I import this .json file, I only get

[marph91]

Could you describe how this note looks in Tiddlywiki or even send a screenshot?

Hi @furicle, do you have any feedback?

[furicle]

Sorry - missed your comments above - thanks for looking into this!

I think you're correct that it's a malformed entry, but will review hopefully tomorrow and confirm

[furicle]

It is a working tiddler - it's a png in a file, not embedded.
Screenshot below if I edit it. The png itself is mildly confidential, but it does display correctly.

[marph91]

Ok, it's an external image. External images are handled in release 1.1.11:

• Absolute paths should work.
• For relative paths, the import file path will be taken as reference. In this case, the import file is .\daniel-spurious-alerts.json, so the expected file location of the image is next to the json file (./img/2025/image0.png). Is this the correct path?

[furicle]

Yes - exactly.

# wiki
c:\users\furicle\downloads\dottw\todo-tw5\tdn.html    
# png file
c:\users\furicle\downloads\dottw\todo-tw5\img\2025\image0.png

I have a whole slew of external images in this wiki like this.