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The file parameter documentation for the POST /1/cards/[card id or shortlink]/attachments API call does not specify how the file should be encoded. For "Valid Values" it simply says "A file". I was wondering if anyone has a working example of how to get files into Trello cards using the API.

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closed as off topic by phwd Aug 27 '12 at 19:01

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Trello uses that API to attach files, so you should be able to use it as an example. (i.e. you can look at the Network tab in Chrome after attaching a file) –  Daniel LeCheminant Aug 27 '12 at 17:50
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API questions are off-topic here, it might work on Stack Overflow but be sure to show prior work in the form of code –  phwd Aug 27 '12 at 19:02
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1 Answer 1

You should be able to add an attachment using the multipart/form-data content type:

<form action="https://api.trello.com/1/cards/REPLACE_WITH_CARD_ID/attachments"
      method="POST" enctype="multipart/form-data">
   <input type="hidden" name="key" value="REPLACE_WITH_YOUR_KEY" />
   <input type="hidden" name="token" value="REPLACE_WITH_YOUR_WRITE_TOKEN" />
   <input type="file" name="file">
   <input type="submit" value="Upload">
</form>

(You don't necessarily have to be POSTing from a webpage, but that's an easy example)

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If I'm not using HTML forms can I just set the value of the file parameter in the post to a Base64 encoded file? Or will I somehow need to convert that into multipart/form-data? Sorry if I'm being stupid. –  Jack Jones Aug 27 '12 at 18:21
    
The library we're using to handle forms doesn't yet support base64 –  Daniel LeCheminant Aug 27 '12 at 18:58
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