YAML Syntax Validator & Linter | Nadhebe

YAML CODE INPUT

YAML Manifest / Config

VALIDATION & LINT REPORT

Validation Status

Valid YAML Syntax ✓

0 Indentation or Syntax Errors Detected

Parsed YAML Structure Summary

YAML Validation & Indentation Standards Guide

YAML (YAML Ain't Markup Language) is the standard configuration format for DevOps pipelines, GitHub Actions workflows, Kubernetes deployments, and OpenAPI specifications.

Common YAML Lint Errors

Tab Characters: Using tabs instead of 2 spaces causes parse failures.
Colon Spacing: Keys must be followed by a space after the colon (key: value).
Unquoted Special Characters: Strings containing colons, @, or % require double quotes.

Related Developer Tools

Convert YAML to JSON with the YAML to JSON Converter, generate OpenAPI schemas with the OpenAPI 3 YAML Generator, or validate JSON schemas with the JSON Schema Validator.

Frequently Asked Questions

Common questions about this tool.

How does the YAML Syntax Validator work? ▼

The validator parses your YAML text line-by-line client-side, checking indentation rules, tab character usage, colon key-value formatting, and array dash syntax.

Why does YAML throw indentation errors? ▼

YAML requires consistent space indentation (typically 2 spaces per level). Using TAB characters instead of spaces violates the YAML specification and causes parser errors.

Can I validate Kubernetes or Docker Compose YAML files? ▼

Yes! Paste your `docker-compose.yml` or K8s `deployment.yaml` manifest into the editor to verify syntax correctness before running `kubectl apply`.

Is my YAML code uploaded to external servers? ▼

100% private. All validation and linting execute locally in your web browser.

How can I convert valid YAML to JSON? ▼

Use our dedicated <a href="/tools/yaml-to-json/">YAML to JSON Converter</a> tool to transform valid YAML manifests into JSON objects.