Validate YAML
Validate YAML 1.2 core syntax and supported value types.
Input & settings
How to use this tool
Paste your source, choose the supported options, then process. Inspect or download the complete result.
Limits and behavior
String mapping keys only, duplicate keys rejected. Alias expansion capped at 50 and nesting at 64. Custom tags unsupported. Maximum total input 1 MB, output 3 MB, JSON nesting 64 levels. Processing stays in your browser worker. Input is limited to 1 MB and output to 3 MB. No input content is saved by CraftAI.
Validate YAML configuration syntax
Paste YAML data to check whether it follows supported YAML 1.2 core parsing rules. Use this YAML syntax checker before deploying or sharing configuration files.
Does valid YAML guarantee application configuration is correct?
No. Syntax validation does not know your application's required keys or configuration schema.
Related tools: YAML to JSON · JSON to YAML