YAML Toolkit: Validate, Fix, Merge & Convert YAML

Validate YAML, auto-fix common errors, merge files with conflict resolution, convert to JSON/TOML/Properties/env, and reformat. 100% client-side.

Features

• Syntax validation with line/column errors
• Auto-fix indentation, tabs, and missing colons
• Three-way merge with conflict resolution
• Convert to JSON, TOML, Properties, and .env
• Sort keys alphabetically
• Anchor and alias handling
• 100% client-side

Frequently Asked Questions

Why is YAML indentation so error-prone?

YAML uses indentation (not braces) for structure, and it disallows tabs for indentation. A single wrong space or a tab character can break parsing or silently nest a key in the wrong place. The validator pinpoints the exact location of these errors.

What are YAML anchors and aliases?

Anchors (&base) and aliases (*base) let you define a value once and reuse it elsewhere. This is YAML’s built-in reuse mechanism, similar to variables. The merge key (<<) combines mappings. The toolkit resolves these when converting to other formats.

How does YAML merge handle conflicts?

When two documents define the same key, the merge highlights the conflict inline so you can choose which value wins. This is far safer than silently overwriting configuration.