YAML Data Format: What It Is and How to Use It

YAML (YAML Ain't Markup Language) is a human-friendly text format used to describe structured data. It is the default configuration language for Kubernetes, GitHub Actions, GitLab CI, Ansible, Docker Compose, and many other modern tools.

If you need to work with YAML in spreadsheets or pass it into JSON-based tooling, use our YAML to CSV converter or YAML to JSON converter.

What is YAML?

YAML uses indentation (not braces or tags) to express nesting. The same data structures as JSON, written in a form that is easier for humans to read and edit.

Example:

customer:
  name: Alice
  country: AU
  skills:
    - SQL
    - Python

Because YAML maps cleanly to JSON's data model (objects, lists, strings, numbers, booleans, null), every YAML document can be converted to JSON without loss — and on to CSV when you need a flat spreadsheet view.

Why YAML is widely used

• Human-readable: indentation and unquoted strings make config files easy to skim and diff
• Standard for Kubernetes manifests, Helm charts, and Argo workflows
• Used by CI/CD pipelines: GitHub Actions, GitLab CI, CircleCI, Bitbucket Pipelines
• Common in Ansible playbooks, Docker Compose files, and OpenAPI / Swagger specs
• Comment support (unlike JSON), so config files can be documented inline

YAML vs JSON vs CSV

• YAML is best for human-edited config: Kubernetes, CI pipelines, application settings.
• JSON is best for machine-to-machine APIs and code-friendly nested data.
• CSV is best for flat, tabular data and spreadsheet workflows.

YAML and JSON share the same data model, so you can convert freely between them. CSV is a flatter view — useful when you want to load configuration or data into Excel for review or bulk editing.

Convert now: YAML to CSV · YAML to JSON · JSON to YAML

Common YAML workflows

• Convert a Kubernetes manifest or Helm values file to CSV for review
• Audit a GitHub Actions workflow as a spreadsheet (jobs, steps, runners)
• Flatten an Ansible inventory or playbook for change tracking
• Round-trip YAML to JSON to feed into tools that only accept JSON
• Convert JSON API responses into YAML for human-readable config files

YAML tools on Data.Page

• YAML to CSV — convert YAML into spreadsheet-ready CSV
• YAML to JSON — convert YAML into JSON for APIs and tooling
• JSON to YAML — convert JSON into human-friendly YAML
• JSON Data Format Guide — compare YAML and JSON usage
• CSV Data Format Guide — understand flat file workflows

Need help with a specific YAML file?

If your YAML is large, deeply nested, or uses custom anchors and aliases, we can help. Contact us and share your source format and target output.