#api-integration #n8n #linkedin #schedule

Postiz Extended

Schedule and manage social media posts via Postiz API (self-hosted or cloud). Direct API integration — no n8n dependency. Supports X/Twitter, LinkedIn, Bluesky with platform-specific character limits. Includes deduplication, scheduling, media upload, and thread creation. WHAT IT CAN DO: Schedule posts to 28+ channels (X, LinkedIn, Bluesky, Reddit, Instagram, Facebook, Threads, YouTube, TikTok, Pinterest, Mastodon, and more) Multi-platform posting in a single API call with platform-adapted content X/Twitter thread creation for longer content Media upload (file and URL) Find next available posting slot per channel List, query, update, and delete scheduled posts Deduplication workflow (check existing before posting) Platform-specific character limits and content tone guidance Post state management (QUEUE, PUBLISHED, ERROR, DRAFT) Helper script for quick posting with auto-validation USE WHEN: scheduling social media posts, creating multi-platform content, managing a posting calendar, uploading media for social posts, checking post status, creating X/Twitter threads, or automating social media workflows.

coolmanns@coolmanns

Install

openclaw skills install @coolmanns/postiz-extended

Postiz Social Media Scheduler

Direct API integration for social media posting. No n8n workflows needed.

Setup

Required Environment Variables

bash

# Core configuration
export POSTIZ_URL="https://your-postiz-instance.com"
export POSTIZ_EMAIL="your@email.com"
export POSTIZ_PASSWORD="your-password"

# Integration IDs (get from Postiz dashboard → Integrations)
export POSTIZ_X_ID="your-x-integration-id"
export POSTIZ_LINKEDIN_ID="your-linkedin-integration-id"
export POSTIZ_BLUESKY_ID="your-bluesky-integration-id"

To find your integration IDs:

Go to your Postiz dashboard
Navigate to Integrations or Channels
Each connected account shows an ID (or use the API: GET /api/integrations/list)

Platform Limits

Platform	Character Limit	Notes
X/Twitter	280	Links count as 23 chars (t.co shortening)
LinkedIn	3,000	First 140 chars show in preview
Bluesky	300	Growing tech/developer audience

Platform Content Guidelines

X/Twitter (280 chars)

Short, punchy content
1-2 hashtags max
Threads for longer content (multiple tweets)

LinkedIn (3,000 chars)

Professional tone
Can be longer-form
Hashtags at end (3-5 recommended)
First 140 chars show in preview — make them count!

Bluesky (300 chars)

Similar to X but slightly more room
No official hashtag support (use sparingly)
Growing tech/developer audience

Authentication

bash

# Login and save cookie (required before any API call)
curl -s -c /tmp/postiz-cookies.txt \
  "$POSTIZ_URL/api/auth/login" \
  -H 'Content-Type: application/json' \
  -d "{\"email\":\"$POSTIZ_EMAIL\",\"password\":\"$POSTIZ_PASSWORD\",\"provider\":\"LOCAL\"}"

Cookie expires periodically. Re-run login if you get 401 errors.

Find Next Available Slot

bash

curl -s -b /tmp/postiz-cookies.txt \
  "$POSTIZ_URL/api/posts/find-slot/$POSTIZ_X_ID"

Returns the next open time slot for a given channel. Useful for auto-scheduling without conflicts.

Upload Media from URL

bash

curl -s -b /tmp/postiz-cookies.txt \
  "$POSTIZ_URL/api/media/upload-from-url" \
  -H 'Content-Type: application/json' \
  -d '{"url": "https://example.com/image.png"}'

Creating Posts

Schedule a Post (Single Platform)

bash

curl -s -b /tmp/postiz-cookies.txt \
  "$POSTIZ_URL/api/posts" \
  -H 'Content-Type: application/json' \
  -d "{
    \"type\": \"schedule\",
    \"date\": \"2026-02-05T15:00:00Z\",
    \"posts\": [{
      \"integration\": {\"id\": \"$POSTIZ_X_ID\"},
      \"value\": [{\"content\": \"Your tweet here (max 280 chars)\", \"image\": []}],
      \"settings\": {\"__type\": \"x\"}
    }]
  }"

Multi-Platform Post (Adapted Content)

bash

curl -s -b /tmp/postiz-cookies.txt \
  "$POSTIZ_URL/api/posts" \
  -H 'Content-Type: application/json' \
  -d "{
    \"type\": \"schedule\",
    \"date\": \"2026-02-05T15:00:00Z\",
    \"posts\": [
      {
        \"integration\": {\"id\": \"$POSTIZ_X_ID\"},
        \"value\": [{\"content\": \"Short X version (280 chars max)\", \"image\": []}],
        \"settings\": {\"__type\": \"x\"}
      },
      {
        \"integration\": {\"id\": \"$POSTIZ_LINKEDIN_ID\"},
        \"value\": [{\"content\": \"Longer LinkedIn version with more context and professional tone. Can be up to 3000 characters.\", \"image\": []}],
        \"settings\": {\"__type\": \"linkedin\"}
      },
      {
        \"integration\": {\"id\": \"$POSTIZ_BLUESKY_ID\"},
        \"value\": [{\"content\": \"Bluesky version (300 chars max)\", \"image\": []}],
        \"settings\": {\"__type\": \"bluesky\"}
      }
    ]
  }"

Post Types

schedule — Auto-publish at specified date/time
draft — Save for review (won't auto-publish)
now — Publish immediately

Listing & Querying Posts

Get Posts by Date Range (Required!)

bash

curl -s -b /tmp/postiz-cookies.txt \
  "$POSTIZ_URL/api/posts?startDate=2026-02-01T00:00:00Z&endDate=2026-02-08T00:00:00Z" \
  | jq '.posts[] | {id, state, publishDate, platform: .integration.providerIdentifier, content: .content[0:60]}'

Check for Duplicates Before Posting

bash

# Get recent posts and check content similarity
curl -s -b /tmp/postiz-cookies.txt \
  "$POSTIZ_URL/api/posts?startDate=2026-02-01T00:00:00Z&endDate=2026-02-08T00:00:00Z" \
  | jq -r '.posts[] | "\(.integration.providerIdentifier): \(.content[0:80])"'

Post States

State	Description
`QUEUE`	Scheduled, waiting to publish
`PUBLISHED`	Successfully posted
`ERROR`	Failed to publish
`DRAFT`	Saved but not scheduled

Media Upload

Upload Image

bash

# Upload returns {id, path}
curl -s -b /tmp/postiz-cookies.txt \
  "$POSTIZ_URL/api/media/upload-simple" \
  -F 'file=@/path/to/image.png'

Use in Post

json

"value": [{
  "content": "Post with image",
  "image": [{"id": "MEDIA_ID", "path": "/uploads/..."}]
}]

Twitter/X Threads

For longer content on X, create a thread:

json

"value": [
  {"content": "Tweet 1/3: Introduction to the topic...", "image": []},
  {"content": "Tweet 2/3: The main point explained...", "image": []},
  {"content": "Tweet 3/3: Conclusion and call to action.", "image": []}
]

Managing Posts

Delete Post

bash

curl -s -b /tmp/postiz-cookies.txt -X DELETE \
  "$POSTIZ_URL/api/posts/POST_ID"

Update Schedule

bash

curl -s -b /tmp/postiz-cookies.txt -X PUT \
  "$POSTIZ_URL/api/posts/POST_ID/date" \
  -H 'Content-Type: application/json' \
  -d '{"date": "2026-02-06T10:00:00Z"}'

Best Practices

Avoid Duplicates

Always query existing posts before creating new ones
Use unique identifiers in content (dates, specific references)
Check both QUEUE and PUBLISHED states

Scheduling

Space posts at least 2-4 hours apart per platform
Best times: 9 AM, 12 PM, 5 PM (audience timezone)
Avoid posting same content to all platforms simultaneously

Content Adaptation

Don't just truncate! Rewrite for each platform:

X: Hook + key insight + CTA
LinkedIn: Context + value + engagement question
Bluesky: Casual tech-friendly tone

Helper Scripts

Post to Multiple Platforms

bash

# Single platform
uv run scripts/post.py \
  --platform x \
  --content "Your tweet here" \
  --schedule "2026-02-05T15:00:00Z"

# Multi-platform with different content
uv run scripts/post.py \
  --x "Short X version" \
  --linkedin "Longer LinkedIn version with more detail" \
  --bluesky "Bluesky version" \
  --schedule "2026-02-05T15:00:00Z"

# Post immediately
uv run scripts/post.py \
  --platform x \
  --content "Posting now!" \
  --now

# Validate without posting
uv run scripts/post.py \
  --x "Test content" \
  --validate

Check for Duplicates

bash

# Check last 30 days
uv run scripts/check_duplicates.py

# Check last 7 days
uv run scripts/check_duplicates.py --days 7

# Check if specific content would be duplicate
uv run scripts/check_duplicates.py --content "Your proposed post content"

Troubleshooting

401 Unauthorized

Re-run the login curl command to refresh cookie.

Post Not Publishing

Check state is QUEUE not DRAFT
Verify date is in the future
Check integration is still connected in UI

Duplicate Posts

Always check existing posts before creating. The API doesn't deduplicate automatically.

Missing Environment Variables

Scripts will tell you which env vars are missing. Set them in your shell or .env file:

bash

export POSTIZ_URL="https://your-postiz.example.com"
export POSTIZ_EMAIL="your@email.com"
export POSTIZ_PASSWORD="your-password"
export POSTIZ_X_ID="your-integration-id"

Postiz Extended

Install

Postiz Social Media Scheduler

Setup

Required Environment Variables

Platform Limits

Platform Content Guidelines

X/Twitter (280 chars)

LinkedIn (3,000 chars)

Bluesky (300 chars)

Authentication

Find Next Available Slot

Upload Media from URL

Creating Posts

Schedule a Post (Single Platform)

Multi-Platform Post (Adapted Content)

Post Types

Listing & Querying Posts

Get Posts by Date Range (Required!)

Check for Duplicates Before Posting

Post States

Media Upload

Upload Image

Use in Post

Twitter/X Threads

Managing Posts

Delete Post

Update Schedule

Best Practices

Avoid Duplicates

Scheduling

Content Adaptation

Helper Scripts

Post to Multiple Platforms

Check for Duplicates

Troubleshooting

401 Unauthorized

Post Not Publishing

Duplicate Posts

Missing Environment Variables

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