YAML/JSON5 Config Validator

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Format Comparison

YAML

  • • Human-readable, minimal syntax
  • • Comments with #
  • • No quotes needed for most strings
  • • Indentation-based structure
  • • Best for: Config files, CI/CD

JSON5

  • • JSON with comments (// and /* */)
  • • Trailing commas allowed
  • • Unquoted object keys
  • • Single or double quotes
  • • Best for: OpenClaw configs

JSON

  • • Strict, standardized format
  • • No comments
  • • All keys must be quoted
  • • No trailing commas
  • • Best for: APIs, data exchange

Related tools: YAML ↔ JSON Converter • TOML Editor

What This Tool Does

YAML/JSON5 Config Validator is built for deterministic developer and agent workflows.

Validate YAML, JSON5, and JSON configs with instant error detection, line-by-line feedback, and format conversion. Perfect for OpenClaw, skills, and config files.

Use How to Use for execution steps and FAQ for constraints, policies, and edge cases.

Last updated:

This tool is provided as-is for convenience. Output should be verified before use in any production or critical context.

Agent Invocation

Best Path For Builders

Browser workflow

Runs instantly in the browser with private local processing and copy/export-ready output.

Browser Workflow

This tool is optimized for instant in-browser execution with local data handling. Run it here and copy/export the output directly.

/config-validator/

For automation planning, fetch the canonical contract at /api/tool/config-validator.json.

How to Use YAML/JSON5 Config Validator

  1. 1

    Choose config format

    Select YAML, JSON, or JSON5 format. The tool auto-detects format when you paste, or you manually choose from dropdown.

  2. 2

    Paste your config file

    Copy your config (docker-compose.yml, app.json, .eslintrc, tsconfig.json, etc.) into the textarea. Syntax highlighting shows structure instantly.

  3. 3

    Validate syntax

    Click 'Validate' to check for parse errors, duplicate keys, and format-specific rules. Shows line numbers for quick fixing.

  4. 4

    Check against schema

    Optionally paste a JSON Schema to validate values (e.g., port must be 1-65535, loglevel must be 'info' or 'debug').

  5. 5

    Export clean config

    Download the validated config, optionally minified or expanded. Convert between YAML and JSON if needed.

Frequently Asked Questions

What is YAML/JSON5 Config Validator?
YAML/JSON5 Config Validator checks your configuration files for syntax errors and formatting issues. It supports YAML, JSON5, and standard JSON with instant error detection, linting, and format conversion.
How do I use YAML/JSON5 Config Validator?
Paste your config file contents into the editor. The tool instantly validates the syntax, highlights any errors with line numbers, and lets you convert between YAML, JSON5, and JSON formats.
Is YAML/JSON5 Config Validator free?
Yes. This tool is free to use with immediate access—no account required.
Does YAML/JSON5 Config Validator store or send my data?
No. All processing happens entirely in your browser. Your configuration data never leaves your device — nothing is sent to any server.
What is JSON5 and why would I validate it?
JSON5 is a superset of JSON that allows comments, trailing commas, unquoted keys, and single-quoted strings. Many config files use JSON5 syntax, and this tool validates them without requiring strict JSON compliance.