Facebook - Postbreeze

Quick reference

Field	Value
Caption limit	63,206 characters
Photos per post	1–10
Videos per post	1
Mixed media	❌ Not on organic Page posts
Image formats	JPG, PNG, GIF, WebP, HEIC, HEIF
Video formats	MP4, MOV, AVI, WebM
Max image size	5 GB
Max video size	5 GB
Reel duration	3–90 seconds
Feed video duration	up to 240 minutes
Reels per Page	30 per 24 hours
Post types	Feed, Photo, Photo Carousel, Video, Reel
First comment	✅ Auto-posts after publish (not on Reels)
Account types	Facebook Pages (not personal profiles)

The image/video size caps above are Postbreeze’s server-side ingest limits. Facebook’s own publish-time caps are tighter (Reels must be 9:16 and 3–90s, max 30 Reels per Page per 24h, etc.) — exceed those and the publish step returns an error from Meta even though the upload succeeded.

Before you start

You can only publish to Facebook Pages you administer. Personal-profile publishing isn’t exposed by the Graph API. The OAuth flow enumerates the Pages on your account during connect — pick the Page you want to publish to from that list.

Required scopes:

pages_show_list — read the list of Pages you administer.
pages_manage_posts — create posts on your Pages.
pages_manage_engagement + pages_read_engagement — first-comment + inbox replies.
pages_read_user_content — inbox comments-on-your-posts feed.

Reels require Meta App Review with the Reels use-case enabled. Before review approval, video posts work fine but kind: "REEL" will return FB_REEL_NOT_APPROVED.

Quick start

Workspace is inferred from your API key — no workspaceId argument and no workspace in the URL. Use the flat shape (content + platforms) for the common case; drop to the nested shape at the bottom of this page only when a power-user workflow demands it.

import Postbreeze from "@postbreeze/node";

const postbreeze = new Postbreeze({ apiKey: process.env.POSTBREEZE_API_KEY });

const post = await postbreeze.posts.create({
  content: "Our new feature drop — read more 👇",
  scheduledFor: new Date(Date.now() + 30_000).toISOString(),
  platforms: [{
    accountId: "soc_facebook_…",
    platformOptions: {
      platform: "FACEBOOK_PAGE",
      kind: "FEED",
      link: "https://example.com/blog/new-feature",
    },
  }],
});

See Platform settings → Facebook for the full platformOptions reference and Media uploads for the two ways to attach images and video.

Content types

Feed (text + optional link)

kind: "FEED". Pure text post, optionally with a link whose OG preview Facebook auto-generates. When you attach media to a FEED post, the server auto-normalizes it to PHOTO (1 image) or PHOTO_CAROUSEL (2–10) — you don’t have to set kind yourself.

Photo (single image)

kind: "PHOTO". Send exactly one image, either by mediaIds (the presign flow) or by mediaItems (URL ingest).

Node.js — pre-uploaded media

await postbreeze.posts.create({
  content: "New drop today",
  mediaIds: ["med_abc123"],
  scheduledFor: new Date(Date.now() + 30_000).toISOString(),
  platforms: [{
    accountId: "soc_facebook_…",
    platformOptions: { platform: "FACEBOOK_PAGE", kind: "PHOTO" },
  }],
});

Node.js — URL ingest (alternative)

await postbreeze.posts.create({
  content: "New drop today",
  mediaItems: [
    { type: "image", url: "https://cdn.example.com/drop.jpg", altText: "Product hero shot" },
  ],
  scheduledFor: new Date(Date.now() + 30_000).toISOString(),
  platforms: [{
    accountId: "soc_facebook_…",
    platformOptions: { platform: "FACEBOOK_PAGE", kind: "PHOTO" },
  }],
});

mediaItems accepts any reachable URL — Postbreeze fetches the asset through an SSRF-guarded ingest path. Use mediaIds when you’ve already uploaded the file via the presign flow.

Photo Carousel (2–10 images)

kind: "PHOTO_CAROUSEL". Mixed photo + video is not allowed on organic Page posts — that surface is ads-only.

const post = await postbreeze.posts.create({
  content: "Highlights from the event",
  mediaIds: ["med_1", "med_2", "med_3", "med_4", "med_5"],
  scheduledFor: new Date(Date.now() + 30_000).toISOString(),
  platforms: [{
    accountId: "soc_facebook_…",
    platformOptions: {
      platform: "FACEBOOK_PAGE",
      kind: "PHOTO_CAROUSEL",
    },
  }],
});

Video

kind: "VIDEO". Single video file. Up to 4 hours of runtime; the server-side ingest cap is 5 GB.

Node.js

await postbreeze.posts.create({
  content: "Behind the scenes of the launch",
  mediaIds: ["med_video_abc"],
  scheduledFor: new Date(Date.now() + 30_000).toISOString(),
  platforms: [{
    accountId: "soc_facebook_…",
    platformOptions: { platform: "FACEBOOK_PAGE", kind: "VIDEO" },
  }],
});

Reel

kind: "REEL". 9:16, 3–90 seconds, video-only. Optionally pass reelTitle — it’s prepended to the description on the Reel surface (not the Feed).

Node.js

await postbreeze.posts.create({
  content: "How we shipped this in a week",
  mediaIds: ["med_reel_abc"],
  scheduledFor: new Date(Date.now() + 30_000).toISOString(),
  platforms: [{
    accountId: "soc_facebook_…",
    platformOptions: {
      platform: "FACEBOOK_PAGE",
      kind: "REEL",
      reelTitle: "Shipping in a week",
    },
  }],
});

Media requirements

Images

Property	Requirement
Max items	10 per carousel, 1 per Photo post
Formats	JPG, PNG, GIF, WebP, HEIC, HEIF
Max file size	5 GB (server-side ingest)
Aspect ratio	Any (Facebook crops to 1.91:1 in Feed by default)
Min resolution	600 × 315

Videos

Property	Requirement
Formats	MP4, MOV, AVI, WebM
Max file size	5 GB (server-side ingest)
Max duration (Feed)	240 minutes
Max duration (Reel)	90 seconds
Min duration (Reel)	3 seconds
Aspect ratio (Feed)	16:9 to 1:1
Aspect ratio (Reel)	9:16
Codecs	H.264 + AAC

Platform-specific fields

Field	Type	Required	Description
`platform`	`"FACEBOOK_PAGE"`	Yes	Discriminator.
`kind`	enum	No (default `FEED`)	`FEED`, `PHOTO`, `PHOTO_CAROUSEL`, `VIDEO`, or `REEL`. With media attached, `FEED` auto-normalizes to `PHOTO` / `PHOTO_CAROUSEL`.
`link`	URL	No	Outbound link. Auto-generates a preview card when `kind: "FEED"`.
`reelTitle`	string	No	Reel-only title prepended to the description (≤ 2,200 chars).

That’s the complete schema — there is no pageId, geoRestriction, or story support on Facebook today. The firstComment field is not inside platformOptions; it lives one level up as a sibling of platformOptions on each platforms entry (see below).

First comment

Pass firstComment on the platforms entry — sibling of platformOptions, not nested inside it. Facebook publishes the comment as the Page (not as a personal user). No delay needed — Facebook accepts immediate comments after publish.

Node.js

await postbreeze.posts.create({
  content: "Our new feature drop",
  scheduledFor: new Date(Date.now() + 30_000).toISOString(),
  platforms: [{
    accountId: "soc_facebook_…",
    platformOptions: { platform: "FACEBOOK_PAGE", kind: "FEED" },
    firstComment: "More details on our blog → https://example.com/blog/new-feature",
  }],
});

Limit: 8,000 characters per Page comment. First comments are supported on every Facebook surface except Reels — Meta’s Reels API rejects programmatic first comments.

Analytics

Metric	Available
Page follows	✅
Page media views	✅
Page post engagements	✅
Page video views	✅
Page views total	✅
Reach	✅
Reactions breakdown	✅
Post clicks	✅
Comments	✅
Shares	✅

Refresh cadence: every 14 days. The 2026 metric names above (page_follows, page_media_view, etc.) replaced the pre-June-2026 page_impressions family. Postbreeze emits the new names directly — no migration needed.

Common errors

Error	Meaning	Fix
`FB_PAGE_TOKEN_EXPIRED`	The Page access token is invalid	Reconnect the account.
`FB_REEL_NOT_APPROVED`	Your Meta App hasn’t been reviewed for the Reels use-case	Submit for Meta App Review.
`FB_MIXED_MEDIA`	Photos + videos in `mediaIds`	Pick one type.
`FB_CAROUSEL_SIZE`	Carousel had fewer than 2 or more than 10 photos	Trim to 2–10.
`FB_RATE_LIMITED`	Page or app rate limit hit	Postbreeze retries with backoff.
`FB_LINK_INVALID`	The `link` URL didn’t resolve	Verify the URL works in an incognito browser.
`FB_VIDEO_TOO_LARGE`	Video > 5 GB	Compress before uploading.
`FB_REEL_QUOTA`	More than 30 Reels published on this Page in 24h	Wait for the rolling window to clear; Postbreeze retries with backoff.

What you can’t do

❌ Publish to personal Facebook profiles
❌ Schedule via Facebook’s native scheduler (we use our own queue)
❌ Mix video and image in one carousel (ads-only feature)
❌ Live video / Live Reels
❌ Stories (planned for v2)
❌ Tag specific users in caption text
❌ Add location tags (Meta removed this from the Graph API)
❌ Cross-post to Instagram in the same call (use two entries in platforms)
❌ First comment on Reels (Meta API limitation)

Full control: nested shape

The flat shape (content + platforms) above is the canonical entry point and covers every Facebook use case. Postbreeze also accepts an equivalent nested shape (caption + targets) for callers porting from older internal tooling — the two shapes produce identical posts.

import Postbreeze from "@postbreeze/node";

const postbreeze = new Postbreeze({ apiKey: process.env.POSTBREEZE_API_KEY });

const post = await postbreeze.posts.create({
  caption: "Our new feature drop — read more 👇",
  scheduledAt: new Date(Date.now() + 30_000).toISOString(),
  mediaIds: ["med_hero_image"],
  targets: [{
    socialAccountId: "soc_facebook_…",
    platformOptions: {
      platform: "FACEBOOK_PAGE",
      kind: "PHOTO",
      link: "https://example.com/blog/new-feature",
    },
    firstComment: "More details on our blog →",
  }],
});

Field mapping flat ↔ nested:

Flat	Nested
`content`	`caption`
`scheduledFor`	`scheduledAt`
`platforms[]`	`targets[]`
`platforms[].accountId`	`targets[].socialAccountId`
`mediaItems` / `mediaIds`	`mediaIds` (URL ingest is flat-only)

Prefer the flat shape for all new integrations.

​Quick reference

​Before you start

​Quick start

​Content types

​Feed (text + optional link)

​Photo (single image)

​Photo Carousel (2–10 images)

​Video

​Reel

​Media requirements

​Images

​Videos

​Platform-specific fields

​First comment

​Analytics

​Common errors

​What you can’t do

​Full control: nested shape

Quick reference

Before you start

Quick start

Content types

Feed (text + optional link)

Photo (single image)

Photo Carousel (2–10 images)

Video

Reel

Media requirements

Images

Videos

Platform-specific fields

First comment

Analytics

Common errors

What you can’t do

Full control: nested shape