Professional YAML Tools - Free, Fast & Secure

The ultimate online YAML validator, formatter, and converter trusted by developers worldwide. Process your YAML files instantly with enterprise-grade accuracy.

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Why Choose YAML.cc for Your Development Workflow?

Instant YAML Processing

Process and validate YAML files in milliseconds with our optimized client-side engine. No server delays, no waiting time - just instant results for maximum productivity.

• Real-time syntax validation
• Instant error detection
• Zero latency processing

Enterprise-Grade Security

Your sensitive configuration files never leave your browser. All YAML processing happens locally on your device, ensuring complete privacy and data security.

• 100% client-side processing
• No data transmission
• GDPR compliant

Completely Free YAML Tools

Access professional-grade YAML tools without any cost. No registration, no hidden fees, no usage limits - just powerful tools available 24/7.

• No account required
• Unlimited usage
• Always free

Precision & Accuracy

Built on the industry-standard js-yaml library, our tools deliver precise validation and formatting results that you can trust for production environments.

• Industry-standard parsing
• Detailed error reporting
• Production-ready output

What is a YAML File?

YAML (YAML Ain't Markup Language) is a human-readable data serialization standard that is commonly used for configuration files, data exchange, and application settings. YAML files use indentation to represent structure and are designed to be both human and machine readable.

Key Features of YAML:

Human-readable: Easy to read and write for both humans and machines
Indentation-based: Uses spaces or tabs to indicate structure
Data types: Supports strings, numbers, booleans, arrays, and objects
Comments: Allows comments using the # symbol
Cross-platform: Works across different programming languages and platforms

Common Use Cases:

Configuration files for applications and services
Docker Compose files
CI/CD pipeline configurations (GitHub Actions, GitLab CI)
API documentation (OpenAPI/Swagger)
Data serialization and exchange

YAML Examples

Real-world YAML examples for common use cases

Application Configuration

Common application settings and environment configuration

# Application Configuration
app:
  name: "My Web App"
  version: "1.2.0"
  debug: false
  
server:
  host: "localhost"
  port: 8080
  ssl: true
  
database:
  driver: "postgresql"
  host: "db.example.com"
  port: 5432
  name: "myapp_db"
  pool_size: 10
  
logging:
  level: "info"
  file: "/var/log/app.log"
  max_size: "100MB"

Docker Compose Configuration

Multi-container application orchestration with Docker Compose

# Docker Compose Configuration
version: '3.8'

services:
  web:
    build: .
    ports:
      - "3000:3000"
    environment:
      - NODE_ENV=production
      - DATABASE_URL=${DATABASE_URL}
    depends_on:
      - db
      - redis
    
  db:
    image: postgres:13
    environment:
      POSTGRES_DB: myapp
      POSTGRES_USER: user
      POSTGRES_PASSWORD: password
    volumes:
      - db_data:/var/lib/postgresql/data
    
  redis:
    image: redis:6-alpine
    command: redis-server --appendonly yes
    volumes:
      - redis_data:/data

volumes:
  db_data:
  redis_data:

GitHub Actions Workflow

Automated testing and deployment pipeline configuration

# GitHub Actions Workflow
name: CI/CD Pipeline

on:
  push:
    branches: [ main, develop ]
  pull_request:
    branches: [ main ]

jobs:
  test:
    runs-on: ubuntu-latest
    
    strategy:
      matrix:
        node-version: [14.x, 16.x, 18.x]
    
    steps:
      - uses: actions/checkout@v3
      
      - name: Setup Node.js
        uses: actions/setup-node@v3
        with:
          node-version: ${{ matrix.node-version }}
          cache: 'npm'
      
      - name: Install dependencies
        run: npm ci
      
      - name: Run tests
        run: npm test
      
      - name: Build application
        run: npm run build
  
  deploy:
    needs: test
    runs-on: ubuntu-latest
    if: github.ref == 'refs/heads/main'
    
    steps:
      - name: Deploy to production
        run: echo "Deploying to production..."

Kubernetes Deployment

Container orchestration with Kubernetes deployment and service

# Kubernetes Deployment
apiVersion: apps/v1
kind: Deployment
metadata:
  name: web-app
  labels:
    app: web-app
    version: v1.0.0

spec:
  replicas: 3
  selector:
    matchLabels:
      app: web-app
  
  template:
    metadata:
      labels:
        app: web-app
    
    spec:
      containers:
        - name: web-app
          image: myregistry/web-app:1.0.0
          ports:
            - containerPort: 3000
          
          env:
            - name: NODE_ENV
              value: "production"
            - name: DATABASE_URL
              valueFrom:
                secretKeyRef:
                  name: app-secrets
                  key: database-url
          
          resources:
            requests:
              memory: "256Mi"
              cpu: "250m"
            limits:
              memory: "512Mi"
              cpu: "500m"
          
          livenessProbe:
            httpGet:
              path: /health
              port: 3000
            initialDelaySeconds: 30
            periodSeconds: 10

---
apiVersion: v1
kind: Service
metadata:
  name: web-app-service

spec:
  selector:
    app: web-app
  
  ports:
    - protocol: TCP
      port: 80
      targetPort: 3000
  
  type: LoadBalancer

OpenAPI 3.0 Specification

REST API documentation and specification using OpenAPI standard

# OpenAPI 3.0 Specification
openapi: 3.0.0
info:
  title: User API
  description: API for managing users
  version: 1.0.0
  contact:
    name: API Support
    email: support@example.com

servers:
  - url: https://api.example.com/v1
    description: Production server
  - url: https://staging-api.example.com/v1
    description: Staging server

paths:
  /users:
    get:
      summary: List all users
      tags:
        - Users
      parameters:
        - name: limit
          in: query
          description: Number of users to return
          required: false
          schema:
            type: integer
            minimum: 1
            maximum: 100
            default: 20
      responses:
        '200':
          description: Successful response
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/User'
    
    post:
      summary: Create a new user
      tags:
        - Users
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreateUser'
      responses:
        '201':
          description: User created successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/User'

components:
  schemas:
    User:
      type: object
      properties:
        id:
          type: integer
          example: 1
        name:
          type: string
          example: "John Doe"
        email:
          type: string
          format: email
          example: "john@example.com"
        created_at:
          type: string
          format: date-time
    
    CreateUser:
      type: object
      required:
        - name
        - email
      properties:
        name:
          type: string
          minLength: 1
          maxLength: 100
        email:
          type: string
          format: email

Complex Data Structure

Advanced YAML structures with nested objects, arrays, and complex data types

# Complex Data Structure
company:
  name: "Tech Solutions Inc."
  founded: 2015
  headquarters:
    address:
      street: "123 Innovation Drive"
      city: "San Francisco"
      state: "CA"
      zip: "94105"
      country: "USA"
    coordinates:
      latitude: 37.7749
      longitude: -122.4194

departments:
  - name: "Engineering"
    budget: 2500000
    employees: 45
    teams:
      - name: "Frontend"
        lead: "Alice Johnson"
        members: ["Bob Smith", "Carol Davis", "David Wilson"]
        technologies: ["React", "TypeScript", "CSS"]
      - name: "Backend"
        lead: "Eve Brown"
        members: ["Frank Miller", "Grace Lee", "Henry Taylor"]
        technologies: ["Node.js", "PostgreSQL", "Docker"]
  
  - name: "Marketing"
    budget: 800000
    employees: 12
    campaigns:
      - name: "Q1 Launch"
        start_date: "2024-01-01"
        end_date: "2024-03-31"
        channels: ["social_media", "email", "paid_ads"]
        target_audience:
          age_range: [25, 45]
          interests: ["technology", "innovation", "productivity"]

products:
  - name: "CloudSync Pro"
    version: "2.1.0"
    price: 99.99
    features:
      - "Real-time synchronization"
      - "End-to-end encryption"
      - "Multi-platform support"
    supported_platforms:
      desktop: ["Windows", "macOS", "Linux"]
      mobile: ["iOS", "Android"]
    release_notes:
      "2.1.0": |
        - Added dark mode support
        - Improved sync performance by 40%
        - Fixed memory leak in mobile app
      "2.0.0": |
        - Complete UI redesign
        - New collaboration features
        - Enhanced security protocols

YAML Syntax Guide

Basic Syntax

# Comments start with hash
key: value
number: 42
boolean: true
null_value: null

Strings

# Different string formats
plain_string: Hello World
quoted_string: "Hello World"
single_quoted: 'Hello World'
multiline: |
  This is a multiline
  string with line breaks

Lists

# List formats
fruits:
  - apple
  - banana
  - orange

# Inline format
colors: [red, green, blue]

Objects

# Nested objects
person:
  name: John Doe
  age: 30
  address:
    street: 123 Main St
    city: New York

YAML Best Practices

Use Consistent Indentation

Always use spaces (not tabs) for indentation. Stick to 2 or 4 spaces consistently throughout your file.

Good:

parent:
  child: value
  another_child: value

Add Meaningful Comments

Use comments to explain complex configurations and provide context for future maintainers.

Good:

# Database configuration
database:
  host: localhost  # Development server
  port: 5432

Quote Special Values

Quote strings that might be interpreted as other data types to avoid confusion.

Good:

version: "1.0"
status: "true"
phone: "123-456-7890"

Keep Lines Readable

Limit line length to 80-120 characters. Use folded or literal scalars for long text.

Good:

description: >
  This is a long description
  that spans multiple lines
  but will be folded into one

Validate Your YAML

Always validate your YAML files before deployment to catch syntax errors early.

Tools:

Use our online YAML validator
IDE extensions with YAML support
CI/CD pipeline validation

Handle Sensitive Data

Never store passwords or secrets directly in YAML files. Use environment variables or secret management tools.

Good:

database:
  password: ${DB_PASSWORD}
  # Or use secret references
  secret_ref: !vault |
    encrypted_secret_here

YAML Tools

Input YAML

Result

Professional YAML Tools - Free, Fast & Secure

Why Choose YAML.cc for Your Development Workflow?

Instant YAML Processing

Enterprise-Grade Security

Completely Free YAML Tools

Precision & Accuracy

What is a YAML File?

Key Features of YAML:

Common Use Cases:

YAML Examples

Application Configuration

Docker Compose Configuration

GitHub Actions Workflow

Kubernetes Deployment

OpenAPI 3.0 Specification

Complex Data Structure

YAML Syntax Guide

Basic Syntax

Strings

Lists

Objects

YAML Best Practices

Use Consistent Indentation

Add Meaningful Comments

Quote Special Values

Keep Lines Readable

Validate Your YAML

Handle Sensitive Data

Popular YAML Articles

Fix YAML Module Error

YAML Comments

Multiline Strings

YML vs YAML