API Reference

Facebook API

Facebook's Graph API requires app review, Page tokens, separate permissions per feature, and complex media upload flows. Zernio gives you one POST for Pages and Groups with photos, videos, and links.

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Quick Start

1.
Get API Key
Sign up for free and get your API key in seconds.
2.
Connect Account
Use our OAuth flow to connect Facebook accounts.
3.
Start Posting
Make API calls to post content to Facebook.

Post to Facebook Page

JavaScript

const response = await fetch('https://zernio.com/api/v1/posts', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    content: 'Check out our latest product update! 🎉',
    mediaItems: [{ type: 'image', url: 'https://example.com/product.jpg' }],
    platforms: [{
      platform: 'facebook',
      accountId: 'acc_abc123'
    }],
    publishNow: true
  })
});

const post = await response.json();
console.log(post.post._id); // '65f1c0a9e2b5af0012ab34cd'

Facebook Endpoints

POST/v1/posts

Create or schedule a Facebook post (text, photo, video, or link)

GET/v1/posts/{id}

Get status and details of a Facebook post

DELETE/v1/posts/{id}

Cancel a scheduled Facebook post

GET/v1/profiles

List all connected Facebook Pages and profiles

View full API reference →

Media Requirements

Type	Format	Max Size	Notes
Image	JPEG, PNG, GIF, BMP	4 MB	1200x630 recommended
Video	MP4, MOV	10 GB	Up to 240 min duration
Carousel	JPEG, PNG	Up to 10 images	Square or landscape
Link	URL	N/A	Auto-fetches preview

Zernio automatically transcodes and optimizes media for Facebook's requirements.

API Limits

Facebook's Graph API has rate limits based on your app's usage tier. Zernio manages rate limits automatically and retries failed requests.

Zernio handles all rate limiting automatically. We queue and retry requests as needed.

Features

✓Post to Facebook Pages and Groups
✓Schedule posts for optimal engagement
✓Photos, videos, and carousel support
✓Link posts with rich previews
✓Multi-page management
✓Webhook notifications for post status
✓Target audience settings

Response Example

Response

JSON

{
  "post": {
    "_id": "65f1c0a9e2b5af0012ab34cd",
    "status": "published",
    "content": "Check out our latest product update! 🎉",
    "platforms": [{
      "platform": "facebook",
      "accountId": { "_id": "acc_abc123", "username": "YourPage" },
      "status": "published",
      "platformPostId": "123456789012345_987654321098765",
      "platformPostUrl": "https://facebook.com/123456789012345/posts/987654321098765"
    }],
    "publishedAt": "2025-01-10T10:30:00Z"
  },
  "message": "Post published successfully"
}

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