TOML Frontmatter

Despite the popular frontmatter choice being YAML, I am not a fan of YAML, and I am a fan of TOML. I’ve been using it for frontmatter since ~2014 when I created a Hugo site, converting a ton of old database-bound content into markdown with TOML metadata.

Instead of the usual YAML delimited of --- (three dashes), the normal convention with TOML is to use +++ (three pluses).

TOML Spec and Libraries

• Official TOML site
• TOML v1.0.0 Spec
• TOML Implementations

Tools Supporting TOML Frontmatter

Site Generators

• Astro (official site)
• Hugo
• Zola

Configuration files

• CloudFlare’s wrangler.toml
• Rust uses Cargo.toml
• Netlify supports netlify.toml