YAML Validator

Paste your YAML in the left pane, choose an action, and see the result on the right.

What is YAML?

YAML (short for YAML Ain’t Markup Language) is a human-friendly, text-based data serialization format. It is widely used for configuration files, data pipelines, and infrastructure-as-code systems due to its clean and readable syntax.

YAML emphasizes simplicity and readability. Unlike XML or JSON, YAML avoids the use of brackets and quotes where possible, instead relying on indentation to represent structure and nesting. This makes it especially popular in DevOps, CI/CD pipelines, and cloud platforms.

YAML supports common data structures like scalars (strings, numbers, booleans), lists (arrays), and dictionaries (key-value pairs). It’s often used in tools such as Docker Compose, Kubernetes (K8s), GitHub Actions, and Ansible playbooks.

Key Characteristics of YAML:

Readable and concise: Designed to be easy for humans to read and edit.
Indentation-based structure: Uses whitespace instead of brackets to define nesting.
Supports comments: Use # to add inline or block comments.
Widely supported: YAML is supported by most modern programming languages and automation tools.
Flexible data types: Supports strings, numbers, booleans, lists, and nested objects.

YAML is not a replacement for JSON or XML, but a complementary format optimized for human editing and infrastructure tooling.

YAML Validator – Check and Correct YAML Syntax

The YAML Validator helps you instantly detect and fix syntax errors in YAML files. Whether you're configuring CI/CD pipelines, defining Kubernetes manifests, or writing API specs, clean and valid YAML is critical to avoid runtime issues.

Why Use a YAML Validator?

Prevent syntax issues: Catch problems like incorrect indentation, invalid keys, or unquoted strings early in development.
Validate configuration files: Ensure your YAML is compatible with tools like Docker Compose, GitHub Actions, and Helm charts.
Debug deployment issues: Verify your YAML before pushing to production or committing to version control.
Improve collaboration: Share well-structured, error-free YAML with your team or automation tools.

How to Use the Tool

Paste your YAML code into the left editor.
Click the “Validate YAML” button located between the editors.
View errors or success messages in the right panel with helpful highlights and line numbers.

This tool supports multi-document YAML, complex nesting, anchors, and aliases. It’s optimized for developers, DevOps engineers, and anyone working with structured configuration formats across modern infrastructure stacks.

👉 Try the YAML Validator Tool

Need more tools? Try our JSON to XML Converter or JSON Diff Tool.