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I'm trying to migrate from the deprecated files.upload API to the new Slack upload flow using files.getUploadURLExternal.

According to the documentation, the request should include a filename and length field. However, Slack keeps returning an error saying those fields are missing.

Here is my curl command:

curl -s -X POST https://slack.com/api/files.getUploadURLExternal \
  -H "Authorization: Bearer TOKEN" \
  -H "Content-Type: application/json; charset=utf-8" \
  --data '{"filename":"test.csv","length":12}'

Response:

{
  "ok": false,
  "error": "invalid_arguments",
  "response_metadata": {
    "messages": [
      "[ERROR] missing required field: length",
      "[ERROR] missing required field: filename"
    ]
  }
}

What is the correct JSON structure for Slack's files.getUploadURLExternal API? Why does Slack say filename and length are missing even though they are clearly included?

Improve this question
2
  • The call generator tab shows sending them as query parameters, not a JSON payload - did you try that? Commented Nov 17 at 11:01
  • Does the API accept JSON? I know it looks like JSON, but it might just be parameters as URL-encoded form data. Could you try: --data "filename=test.csv&length=12"? Commented Nov 17 at 11:01
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