Slack Upload API Post Messages to Channels

Post text to Slack programmatically. Incoming Webhook API simplified.

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slack-upload.ts 
import { UploadPost } from 'upload-post';

const uploader = new UploadPost('your-api-key');

await uploader.uploadText({
  title: 'Release notes',
  user: 'my-user',
  platforms: ['slack']
});

Slack API Features

Text Posts

Send text messages to any Slack channel.

Incoming Webhook

Publish with a single Slack Incoming Webhook URL.

Title Formatting

Add a bold title above your message body.

No OAuth

Paste your webhook URL — no app install or token refresh.

Channel Ready

Post to whichever channel the webhook targets.

Scheduling

Schedule messages for optimal engagement.

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This endpoint is part of one social media API that covers 22 networks. See every supported platform or compare it with the alternatives in best social media APIs 2026.