link-preview

Link Preview Plugin

URL metadata extraction: Open Graph, Twitter Card, and oEmbed with caching. Free: MIT licensed.

Install

nself plugin install link-preview

What It Does

Extracts rich metadata from URLs for link preview cards. Fetches Open Graph tags, Twitter Card metadata, and oEmbed data. Results are cached in Postgres to avoid repeated fetches. Use it to power link preview features in chat, CMS, or social feed applications.

Configuration

Env Var	Default	Description
LINK_PREVIEW_PORT	3718	Link preview service port
LINK_PREVIEW_CACHE_TTL	3600	Cache TTL in seconds (1 hour)
LINK_PREVIEW_TIMEOUT	10s	HTTP fetch timeout
LINK_PREVIEW_MAX_SIZE	5MB	Max page size to fetch

Ports

Port	Purpose
3718	Link preview REST API

Database Tables

1 table added to your Postgres database:

• np_link_preview_cache: cached URL metadata (title, description, image, favicon)

Nginx Routes

Route	Target
/link-preview/	Link preview API

API

GET  /health: Health check
GET  /preview?url={url}: Fetch or return cached preview
DELETE /preview?url={url}: Invalidate cache for URL
GET  /preview/batch: Batch preview multiple URLs