YAML Formatter & Validator
Format, clean, and validate YAML configurations online. Standardize indentation for Docker Compose, Kubernetes manifests, and GitHub Actions workflows.
What is YAML Formatter & Validator?
YAML Formatter is a developer utility that normalizes indentation and verifies structure in YAML (YAML Ain't Markup Language) documents commonly used for application configuration.
How YAML Formatter & Validator Works
The tool analyzes line indentations, colon key-value separators, list hyphens, and block scalars, ensuring consistent spacing rules required by YAML specification parsers.
Key Features
- ✓Identifies invalid tabs (YAML strictly requires space indentation)
- ✓Standardizes 2-space indentation hierarchy
- ✓One-click copy to clipboard
Common Use Cases
- •Fixing indentation errors in `docker-compose.yml` and Kubernetes manifests
- •Validating GitHub Actions workflow configuration files (`.github/workflows/*.yml`)
- •Formatting Ansible playbooks and OpenAPI / Swagger specifications
Examples & Sample Data
Normalizing Docker Compose YAML
version: '3'
services:
web:
image: nginx
ports:
- "80:80"version: "3"
services:
web:
image: nginx
ports:
- "80:80"Standardizes YAML hierarchy and quotes.
Technical Notes & Limitations
YAML relies strictly on spaces for indentation; tabs are forbidden by the YAML specification and will trigger a warning.
100% Client-Side Privacy Guarantee
All YAML processing is executed in local browser memory.
How to Use YAML Formatter & Validator
- 1
Paste your YAML content into the input editor.
- 2
Click 'Format YAML'.
- 3
Copy the cleaned configuration.