ZeroServer.tools

YAML Validator

Paste YAML to validate syntax and pretty-print. Errors show line and column.

Input YAML

OutputValid

name: ZeroServer Tools
version: '1.0'
features:
  - name: YAML Validator
    category: Formatters
    free: true
config:
  timeout: 30
  retries: 3
  debug: false

4 top-level keys

How YAML validation works

YAML (YAML Ain't Markup Language) is a human-readable data serialization format commonly used in configuration files and CI/CD pipelines. This validator uses the js-yaml library to parse your input — any syntax error (unclosed quotes, bad indentation, duplicate keys) is reported with the exact line and column. Valid YAML is also re-serialized and pretty-printed with consistent 2-space indentation.

Private & free — this tool runs entirely in your browser.