How to Validate YAML

YAML mistakes are easy to miss, especially when indentation is inconsistent. This guide shows a quick way to validate YAML and fix parser errors before deploy.

Example input data

services:
  api:
	image: node:20
    ports:
      - 3000:3000

Why this problem matters

Broken YAML can fail CI pipelines, Kubernetes applies, and configuration loading. Fast validation reduces rollout risk.

Solution overview

Use YAML Validator to check syntax, identify line-level errors, and optionally format valid YAML before final validation.

Step-by-step guide

  1. Paste YAML content or upload a `.yaml` / `.yml` file.
  2. Run validation and read the error message details.
  3. Fix indentation and tabs-vs-spaces issues.
  4. Optionally format valid YAML, then validate again.
  5. Use YAML Formatter for final cleanup before committing config changes.

Use the DataToolbox tool

Continue with the YAML Validator to run this transformation in your browser.

Related tools

Related categories and guides

Categories: Developer Data Tools, JSON Tools

Related guides: How to Compare JSON