YAML Formatter
What is a YAML Formatter?
Prettify, format, and validate YAML configuration files. Fixes inconsistent indentation, highlights syntax errors, and formats YAML structures according to official YAML 1.2 specifications.
Why Use This Tool?
- Kubernetes & Ansible Manifests: Format complex nested Kubernetes YAML manifests and Ansible playbooks.
- CI/CD Workflow Auditing: Validate GitHub Actions `.github/workflows/*.yml` files before pushing to git.
- Fix Indentation Errors: Identify tab vs space indentation errors breaking YAML parsers.
How to Use
- Paste raw or messy YAML text into the editor.
- Click "Format YAML".
- View formatted output with exact 2-space indentation and copy.
Real Working Example
Input:
Messy Input:
name: CI
on: push
jobs:
build:
runs-on: ubuntu-latest
Output Result:
Formatted YAML:
name: CI
on: push
jobs:
build:
runs-on: ubuntu-latest
Important Technical Details & Specifications
- YAML 1.2 AST Engine: Powered by JavaScript `yaml` parser library conforming to YAML 1.2 specifications.
- Tab-to-Space Converter: Automatically converts illegal tab characters into 2-space indentation.
- 100% Client-Side Engine: Zero server network requests.
Related Developer Tools
- YAML to JSON Converter: Convert YAML configs to JSON.
- JSON to YAML Converter: Convert JSON objects to YAML.
- Docker Run to Compose: Convert docker run to Compose YAML.
Frequently Asked Questions
Why are tab characters forbidden in YAML files?
The YAML specification explicitly forbids tabs for indentation because different text editors render tabs with varying column widths.
How many spaces should be used for YAML indentation?
Standard YAML formatting uses 2 spaces per indentation level.
Is it free?
Yes, 100% free.
Are my YAML configuration files sent to an external server?
No, all YAML formatting runs 100% locally in your web browser.
What is the main function of YAML Prettify and Format?
Format and prettify YAML configuration files (Kubernetes, GitHub Actions, Docker Compose) with 2-space indentation and validation. This tool processes yaml prettify and format data 100% locally inside your web browser.