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GET/platform-rules

Get per-platform composer rules with the PostEverywhere API

Server-authoritative composer rules for every supported platform: character limits, image/video constraints, and feature support (threads, carousels, reels, alt text, blog posts). WordPress also carries `blog`: the platform_content.wordpress fields, their limits and defaults. Check before composing for an unfamiliar platform — limits span 300 characters (Bluesky) to 63,206 (Facebook), and some constraints are enforced platform-side only. Served with an ETag; a newly supported platform appears here with no client update. Live since 2026-08-17.

Guide: Media requirements by platform

Responses

  • 200Map of platform → rules
  • 401
  • 500
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