YAML Validator

What is a YAML Validator?

A YAML validator checks that your YAML text follows correct syntax so parsers and tools (like Kubernetes, Docker Compose, and CI/CD systems) can read it reliably. This tool runs in your browser: your content is not sent to our servers. You can validate syntax, pretty-print with consistent indentation, and convert YAML to JSON for APIs or debugging.

Why validate YAML?

Small mistakes—wrong indentation, a missing colon, or an unclosed string—can break deployments or configs. Catching errors early with clear line and column information saves time compared to failing builds or runtime errors later.

Features

• Syntax checking: Detects invalid YAML with readable error messages.
• Live check: As you type, a quick validation runs after a short pause.
• Format: Re-indent and normalize structure with “Validate & format YAML”.
• YAML to JSON: One click replaces the editor content with equivalent JSON.
• Multi-document: Supports multiple documents separated by ---.

How to use this tool

1. Paste YAML into the text area.
2. Click Validate & format YAML to check and pretty-print in place, or Convert to JSON to replace the content with JSON.
3. Use Copy to copy the current text.
4. Click Reset to clear the editor.

Common use cases

• Kubernetes manifests and Helm values
• Docker Compose and CI/CD pipeline YAML
• GitHub Actions, Ansible, and configuration files
• API specs and OpenAPI-related YAML

Frequently Asked Questions (FAQs)