How to post to Facebook from n8n

Step by step

1. Create a free PostWire account

   Open postwire.io/dashboard.html, type your email and press Create my free account. PostWire emails you a link to confirm the address; connecting accounts and publishing unlock once it is confirmed. No password and no card (free plan: 1 business, 20 posts a month, 5 AI drafts a day (about 20 a month), 2 networks per post, 3 scheduled posts at a time — every network connects free, no card).

2. Connect your Facebook Page

   In the dashboard open Accounts and press Connect on Facebook. Facebook shows "Continue as <your name>", then asks which Pages PostWire may use: tick the Page you want to post to and press Save. Pages you manage directly and Pages inside a Business Portfolio both appear. PostWire never sees your Facebook password.

3. Copy your API key

   In the dashboard, open API & MCP and press Copy key on the API key card. It is sent as Authorization: Bearer pw_live_… (the X-API-Key header also works). Keep it server-side.

4. Install the node (self-hosted n8n)

   In n8n: Settings → Community nodes → Install, enter n8n-nodes-postwire, and add a PostWire API credential with the key. The node is not verified by n8n yet, so it installs on self-hosted n8n; on n8n Cloud use the HTTP Request in step 6.

5. Configure Post → Publish

   Networks: Facebook. Content: Smart Distribute: Write a Native Post per Network, with the Idea from the previous node (e.g. {{ $json.title }} — {{ $json.url }}). Media: None for a text post, or URL / Binary File for a photo or a video (Media Type: Detect Automatically). The Facebook draft is short — 40 to 80 characters when the idea allows, under 250 otherwise — with the hook in the first 125 characters, where the mobile feed cuts, and 1 to 3 hashtags; a link can stay in the body. To send your own words, set Content to Same Text on Every Network. Under Options, Dry Run checks everything without publishing.

6. On n8n Cloud, or for a Reel or a Story: one HTTP Request node

   POST to the REST API with header Authorization: Bearer pw_live_…. options.facebook.post_type picks the format: feed (the default), reels (needs a video) or story (a photo or a video):

   POST https://postwire.io/api/post
   Authorization: Bearer pw_live_…
   Content-Type: application/json
   
   // A photo post on the Page, the text as its caption
   {
     "platforms": ["facebook"],
     "text": "{{ $json.post }}",
     "photo_url": "{{ $json.image }}",
     "idempotency_key": "{{ $json.id }}"
   }
   
   // A Reel
   {
     "platforms": ["facebook"],
     "text": "Saturday's open day in 20 seconds.",
     "video_url": "https://…/open-day.mp4",
     "options": { "facebook": { "post_type": "reels" } }
   }

7. Read the result, or schedule it

   A feed post returns its id and its link, https://facebook.com/…. A Reel answers processing, because Facebook processes the video after it receives it. To publish later, use Post → Schedule with When: At a Specific Time or In the Next Free Queue Slot. To react when a post lands, start a second workflow with the PostWire Trigger node (Post Published, Post Failed).

A retry with the same Idempotency Key is refused for 24 hours, so a re-run never posts twice; with Smart Distribute the node sets one per execution. Connection → Check Health in a weekly workflow tells you when Facebook needs a new sign-in, before a scheduled post is due.