Skip to main content

YAML Linter & Viewer

Format, validate, and beautify YAML documents instantly. Our YAML linter checks syntax errors in real-time and helps you fix indentation issues. 100% client-side - your data never leaves your browser.

YAML

YAML1 lines
1

About This YAML Linter

This free YAML linter and validator helps you format, validate, and beautify YAML documents with real-time syntax checking. Whether you're working with Kubernetes configs, CI/CD pipelines, or data serialization, our tool ensures your YAML files are error-free and properly formatted.

Key Features:

  • Real-time YAML validation - Detects syntax errors instantly as you type
  • YAML formatter & beautifier - Auto-formats with proper indentation (2 spaces)
  • YAML syntax checker - Identifies common YAML mistakes
  • 100% privacy-first - All processing happens in your browser
  • No signup required - Start linting YAML immediately
  • Supports all YAML versions - YAML 1.1, 1.2, and beyond

Common Use Cases:

  • Validate Kubernetes manifests and Helm charts
  • Check CI/CD pipeline configurations (GitHub Actions, GitLab CI)
  • Format Docker Compose files
  • Lint Ansible playbooks and inventory files
  • Validate API specifications and configuration files

About the YAML Viewer

Format, validate, and beautify YAML documents. Also known as a YAML linter or prettifier.

Paste YAML to see it formatted with clean indentation. Syntax errors are highlighted with their position.

How to use

  1. Paste your YAML.
  2. The formatted output appears.
  3. Copy the beautified result.

Frequently Asked Questions

Can this tool validate Kubernetes YAML? ▾

Yes — it parses YAML strictly and reports the exact line of syntax errors like bad indentation or duplicate keys, which are the most common kubectl apply failures. It validates syntax; schema validation (required fields per resource) is done by kubectl or kubeconform.

Why does YAML reject tabs? ▾

The YAML specification requires spaces for indentation. Editors often insert tabs silently — this linter flags them so you fix the file before it reaches your pipeline.

Does formatting change my YAML meaning? ▾

No — formatting normalizes indentation and spacing only. Comments and key order are preserved wherever the parser supports them.