header documentation

header is a Go CLI and library for extracting, checking and editing website metadata. It understands Open Graph, Twitter Cards, JSON-LD, App Links, and page links, and can generate preview images.

• Getting started — install the tool and inspect your first page.
• How-to guides — perform focused tasks.
• Concepts — understand extraction, rendering and validation.
• CLI reference — commands and output styles.
• Contributing — development and testing.

Source code: arran4/header. Go package API: pkg.go.dev/github.com/arran4/header.