How can I out Slack’s block kit format (JSON) to a legacy webhook?

Blake Ryan
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February 15, 2025

I’ve been able to successfully set up legacy webhooks from Jira to Slack via automation rules, but if I apply block kit formatting to the outputted message it just comes through in plaintext format. 

I know that a slack app could probably be used to achieve this, but I was hoping there might be a way via the traditional Slack webhook. 

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Kai Krause
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February 16, 2025

Hi and Welcome, 

in my opionon legacy webhooks do not support Block Kit formatting directly, while legacy webhooks are convenient for simple integrations, they do not support Block Kit formatting.

For interactive messages, using a Slack app is my recommended approach. If you're constrained to using legacy webhooks, consider converting your messages to plain text or exploring third-party solutions to handle the conversion.

BR
Kai


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