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I'm writing a script to send a message to Slack using curl. Here's my code:

@echo off
@SETLOCAL EnableExtensions EnableDelayedExpansion
SET topic="Fw: *** Subject: Detail|detail|more-detail|detail:000"
echo %topic%
curl.exe -X POST -H "Content-Type: application/json" --data-urlencode "payload={\"channel\": \"#channelname\", \"username\": \"webhookbot\",\"text\": \"%topic\",\"icon_emoji\": \":ghost:\"}"  SLACK_WEBHOOK -k

Once I execute this script, I get the invalid_payload error along with my echo result. Can someone help me with this problem?

I have read this thread, but I'm still not quite sure how to solve it.

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  • Is this Cygwin, or WSL, or something else? @echo off and curl.exe make this look like a Windows environment. Commented Jan 21, 2020 at 15:34

1 Answer 1

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It seems you're using incomming webhook.

Choose one of following:

a) remove -H 'Content-type: application/json' or change it to -H 'Cotent-type: application/x-www-form-urlencoded'

curl.exe -X POST --data-urlencode "payload={\"channel\": \"#channelname\", \"username\": \"webhookbot\",\"text\": \"%topic\",\"icon_emoji\": \":ghost:\"}" SLACK_WEBHOOK_URL

b) keep content-type as it is, but change --data-urlencode to -d and remove payload= from the data

curl.exe -X POST -H "Content-Type: application/json" -d "{\"channel\": \"#channelname\", \"username\": \"webhookbot\",\"text\": \"%topic\",\"icon_emoji\": \":ghost:\"}" SLACK_WEBHOOK_URL

But if you use Slack API (for example /chat.postMessage):

1) you need to authorize with a token - add curl option -H "Authorization: Bearer YOUR_TOKEN_HERE"

2) don't use --data-urlencode, but -d

from docs: https://api.slack.com/methods/chat.postMessage

When POSTing with application/x-www-form-urlencoded data, the optional attachments argument should contain a JSON-encoded array of attachments. Make it easy on yourself and send your entire messages as application/json instead.

3) remove the from data payload= from data

curl.exe -X POST -H 'Content-Type: application/json' -H "Authorization: Bearer YOUR_TOKEN_HERE" -d "{ \"channel\": \"#channelname\", \"text\": \"message body\", \"username\": \"webhookbot\", \"icon_emoji\": \":ghost:\" }" "https://slack.com/api/chat.postMessage"
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  • You can also use slack api with application/x-www-form-urlencoded. Same rules applies. Commented Jan 21, 2020 at 16:29

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