Online YAML Editor

Write, validate, and format YAML documents with this free online editor. YAML (YAML Ain't Markup Language) is a human-readable data serialization standard commonly used for configuration files, data exchange between languages, and infrastructure-as-code tools like Docker, Kubernetes, and Ansible.

What is YAML?

YAML uses indentation and simple syntax to represent data structures like maps, lists, and scalars. Unlike JSON or XML, YAML is designed to be easy for humans to read and write. It supports comments with #, multi-line strings, anchors for reuse, and clear hierarchical nesting through indentation.

Basic Syntax

# Key-value pairs
name: LabsICT
version: 2.0

# Nested objects
server:
  host: localhost
  port: 3000

# Lists
languages:
  - Python
  - JavaScript
  - Go

# Inline flow style
colors: [red, green, blue]

Try It Yourself

Type any YAML in the editor and click Validate to check your syntax. The editor highlights your content with YAML syntax highlighting and provides real-time validation feedback. Use Copy to copy your YAML, Reset to restore the example, and Theme to switch between dark and light editor modes.