Postiz Social Media Scheduler

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

Quick Reference

Platform Content Guidelines

X/Twitter (280 chars)

• Short, punchy content
• 1-2 hashtags max
• Links count as 23 chars (t.co shortening)
• 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

# Login and save cookie (required before any API call)
curl -s -c /tmp/postiz-cookies.txt \
  'https://postiz.home.mykuhlmann.com/api/auth/login' \
  -H 'Content-Type: application/json' \
  -d '{"email":"sascha@mykuhlmann.com","password":"Postiz2026!","provider":"LOCAL"}'

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

Find Next Available Slot

curl -s -b /tmp/postiz-cookies.txt \
  'https://postiz.home.mykuhlmann.com/api/posts/find-slot/INTEGRATION_ID'

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

Upload Media from URL

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

Creating Posts

Schedule a Post (Single Platform)

curl -s -b /tmp/postiz-cookies.txt \
  'https://postiz.home.mykuhlmann.com/api/posts' \
  -H 'Content-Type: application/json' \
  -d '{
    "type": "schedule",
    "date": "2026-02-05T15:00:00Z",
    "posts": [{
      "integration": {"id": "cml5lbs3h0001o6l6gagj9gcq"},
      "value": [{"content": "Your tweet here (max 280 chars)", "image": []}],
      "settings": {"__type": "x"}
    }]
  }'

Multi-Platform Post (Adapted Content)

curl -s -b /tmp/postiz-cookies.txt \
  'https://postiz.home.mykuhlmann.com/api/posts' \
  -H 'Content-Type: application/json' \
  -d '{
    "type": "schedule",
    "date": "2026-02-05T15:00:00Z",
    "posts": [
      {
        "integration": {"id": "cml5lbs3h0001o6l6gagj9gcq"},
        "value": [{"content": "Short X version (280 chars max)", "image": []}],
        "settings": {"__type": "x"}
      },
      {
        "integration": {"id": "cml5k1d710001s69hwekkhx1p"},
        "value": [{"content": "Longer LinkedIn version with more context and professional tone. Can be up to 3000 characters.", "image": []}],
        "settings": {"__type": "linkedin"}
      },
      {
        "integration": {"id": "cml5mre6w0009o6l6svc718ej"},
        "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!)

curl -s -b /tmp/postiz-cookies.txt \
  'https://postiz.home.mykuhlmann.com/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

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

Post States

Media Upload

Upload Image

# Upload returns {id, path}
curl -s -b /tmp/postiz-cookies.txt \
  'https://postiz.home.mykuhlmann.com/api/media/upload-simple' \
  -F 'file=@/path/to/image.png'

Use in Post

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

Twitter/X Threads

For longer content on X, create a thread:

"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

curl -s -b /tmp/postiz-cookies.txt -X DELETE \
  'https://postiz.home.mykuhlmann.com/api/posts/POST_ID'

Update Schedule

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

Best Practices

Avoid Duplicates

1. Always query existing posts before creating new ones
2. Use unique identifiers in content (dates, specific references)
3. 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 Script

Use scripts/post.py for easier posting with automatic character validation:

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

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

Web UI

Dashboard: https://postiz.home.mykuhlmann.com

• Visual calendar view
• Drag-and-drop scheduling
• Analytics and engagement stats

Troubleshooting

401 Unauthorized

Re-run the login curl command to refresh cookie.

Post Not Publishing

1. Check state is QUEUE not DRAFT
2. Verify date is in the future
3. Check integration is still connected in UI

Duplicate Posts

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