YAML Validator
About YAML Validator
The YAML Syntax Validator and Linter inspects YAML configuration files (Kubernetes, Docker Compose, GitHub Actions, Ansible), highlighting indentation errors, duplicate keys, and invalid types with exact line and column markers.
How to Use YAML Validator
Step 1
Paste your YAML code into the editor.
Step 2
Inspect the validation status badge (VALID / INVALID).
Step 3
Review any reported syntax errors with exact line pointers.
Step 4
Click "Format / Fix" to clean whitespace.
Practical Use Cases for YAML Validator
CI/CD Pipeline & GitHub Actions Workflow Linting
Verify YAML workflow files (`.github/workflows/*.yml`) for indentation bugs before pushing commits to Git repositories.
Kubernetes Manifest & Helm Chart Validation
Ensure Kubernetes pod specifications and Helm values files are syntactically valid before deployment.
Input & Output Examples
Catching Tab Character Indentation Error
server:\n\tport: 8080 (Tab used instead of spaces)
YAML Error at Line 2, Column 1: Tabs are not allowed as indentation characters in YAML.
Key Features & Performance
- ✓Validates YAML 1.2 syntax in real time with line and column error indicators.
- ✓Detects common YAML pitfalls: tab characters, unquoted strings with special characters, duplicate map keys.
- ✓Provides 1-click automatic syntax fixing for common indentation mistakes.
- ✓100% Client-Side memory execution guarantees file privacy.
- ✓1-Click Copy validated YAML.
Key Terminology & Definitions
YAML Tab Character Restriction
YAML specifications strictly forbid tab characters (`\t`) for indentation; only ASCII space characters are valid.
Scalar Types
Individual primitive values in YAML such as strings, numbers, booleans, and nulls.