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Smart file previews

Open a data or config file and get a rendered or plain-English preview: JSON/YAML/TOML/XML trees, OpenAPI docs, and decoded systemd, ssh, Dockerfile, fstab, crontab, and GitHub Actions files.

Many file types get the same 3-mode preview as Markdown, turning raw config and data into something readable.

• Structured data: .json / .yaml / .toml render a collapsible, type-colored data tree, and .xml renders a faithful DOM tree. A JSON/YAML file recognized as an OpenAPI 3 / Swagger 2 spec instead renders as browsable API docs (endpoints, method badges, params, responses, schemas), with a tree ⇄ docs toggle.
• Config files, decoded to plain English: crontab (30 2 * * 1-5 becomes “At 02:30, Monday through Friday”, with next fire times), fstab mounts, systemd units (with OnCalendar= next triggers), SSH config (a one-line connection summary per host), Dockerfile (a per-stage digest), and GitHub Actions workflows (triggers and jobs). Malformed lines are flagged.
• Viewers: .pdf files open in a read-only page viewer, .svg files stay editable XML but gain a live rendered-image preview, and binaries open as a hex dump.

All on by default, each toggled under Settings → Editor. See the previews guide.