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YAML Formatter & Validator – Clean & Validate Config Files

Beautify YAML/YML with strict indentation, convert to JSON, and validate syntax before deployments or automation runs.

🟢 Runs locally · no uploads

YAML Formatter

Format, validate, and convert YAML data

lightbulbPopular Use Cases

deployed_code
Docker Compose

Format Docker Compose configuration files

cloud
Kubernetes Manifests

Format k8s deployment and service configurations

automation
GitHub Actions/CI

Format workflow and CI/CD configuration files

settings
Application Config

Format app settings and environment configurations

YAML Input
YAML

Start Formatting YAML

Paste your YAML, drag & drop a file, or try an example

Formatted YAML

Formatted YAML will appear here

Quick Examples & Practice

Simple examples to get started with YAML formatting

Basic Configuration
name: MyApp version: 1.0.0 database: host: localhost port: 5432
Docker Compose
version: "3.8" services: web: image: nginx ports: - "80:80" db: image: postgres environment: POSTGRES_PASSWORD: secret

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› About this tool · FAQ

Format, validate, and convert YAML data with syntax checking, JSON conversion, and beautification options.

What is YAML?

YAML (YAML Ain't Markup Language) is a human-readable data serialization standard commonly used for configuration files and data exchange.

Should I use tabs or spaces in YAML?

Always use spaces, never tabs. YAML specification requires spaces for indentation. Most editors can be configured to show whitespace.

How do I handle special characters in YAML?

Use quotes around strings containing special characters like colons, brackets, or quotes. Single quotes preserve literal content, double quotes allow escape sequences.

What's the difference between YAML and JSON?

YAML is more human-readable with significant whitespace and supports comments. JSON is more compact and widely supported. Both represent the same data structures.

Can YAML contain comments?

Yes, YAML supports comments using the # symbol. Comments can be on their own line or at the end of a line with data.