Markdown Frontmatter Editor (YAML / TOML / JSON)

Static site generators (Jekyll, Hugo, Astro, Eleventy) store post metadata in a frontmatter block at the top of each Markdown file. Different SSGs prefer different formats — Jekyll defaults to YAML, Hugo defaults to TOML, MDX commonly uses ESM / JSON. This editor parses your existing frontmatter, lets you edit fields, and converts between formats.

How to use the Markdown Frontmatter Editor (YAML / TOML / JSON)

Paste a Markdown file (with or without existing frontmatter). The fields parse into editable rows. Add / remove / rename. Pick the output format — YAML (Jekyll), TOML (Hugo), or JSON (MDX-friendly).