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YAML vs XML

Comparing YAML Ain't Markup Language and Extensible Markup Language - which format should you use?

	YAML	XML
Full Name	YAML Ain't Markup Language	Extensible Markup Language
Extension	.yml	.xml
MIME Type	application/x-yaml	application/xml
Category	data	data

YAML Pros

+Very human-readable
+Supports comments (JSON doesn't)
+Less verbose than JSON or XML
+Widely used in DevOps (Docker, Kubernetes, GitHub Actions)

YAML Cons

-Indentation-sensitive (tabs vs spaces cause errors)
-Implicit typing can cause surprises ('yes' becomes boolean true)
-Not as fast to parse as JSON
-Complex features (anchors, aliases) are confusing

XML Pros

+Human-readable and self-descriptive
+Platform and language independent
+Supports complex hierarchical data
+Extensive tooling and validation (XSD, DTD)

XML Cons

-Verbose - much larger than JSON or CSV
-Slower to parse than JSON
-Complex syntax rules
-Being replaced by JSON in many modern use cases

Use YAML when...

-Docker Compose files
-Kubernetes manifests
-GitHub Actions workflows
-CI/CD pipeline configs
-Ansible playbooks

Use XML when...

-SOAP web services
-Configuration files (Android, Maven, Spring)
-RSS/Atom feeds
-SVG graphics
-Office document formats (DOCX, XLSX)

Learn more about YAML Learn more about XML