YAML Validator is a free, privacy-first tool for validating, formatting, and viewing YAML files — available as a Chrome extension and a website.

What it does

• Syntax validation — catch indentation errors, duplicate keys, and malformed YAML instantly
• Schema validation — validate against 11+ real-world schemas with auto-detection:
  • Kubernetes, Docker Compose, Helm Chart
  • GitHub Actions, GitLab CI, CircleCI, Azure Pipelines, Bitbucket Pipelines
  • Ansible, OpenAPI 3.0, Swagger 2.0
• Multi-document support — validate files with multiple YAML documents separated by ---
• Smart error reporting — highlights the exact line, shows a gutter marker, and scrolls to the error
• GitHub integration — adds collapsible code blocks to YAML files on GitHub, making large configs easier to navigate

How it works

Paste or type YAML into the editor. YAML Validator auto-detects the schema (e.g., spots apiVersion + kind and picks Kubernetes) and validates both syntax and structure in one click. If the detected schema doesn't match, it suggests the right one with a single-click switch.

Privacy & performance

Everything runs client-side — your files never leave your machine. No accounts, no server processing, no data collection. Works offline, loads instantly.

Built for DevOps workflows

Whether you're writing Kubernetes manifests, debugging a CI pipeline, or reviewing a Helm chart on GitHub — YAML Validator catches errors before they reach production. The Chrome extension currently has around 800 users worldwide.

Available in 54 languages.

DocuCommit is a self-hosted documentation platform that stores every page as plain Markdown in your own Git repository. There is no database: every edit is a real commit, so revision history, diffs, and restore come from Git itself, not from a vendor's revision table.

Non-developers get a WYSIWYG editor that writes clean Markdown (toggle to source anytime), a guided three-pane merge when two people edit the same page, and paragraph comments stored in a sidecar file so the Markdown stays clean. Developers get files they can grep, and AI agents can read the entire knowledge base with a git clone. No integration layer, no sync pipeline.

Includes full-text search, draw.io and Mermaid diagrams stored next to the Markdown, and one-click export to Markdown, HTML, and PDF. A desktop app for editing, plus a read-only server (Docker) that publishes the docs to the whole team. Leaving costs nothing: the repo is already yours, so there is nothing to migrate out of.

A startup from Sweden.