YAML & JSON Linter - Validate YAML and JSON Online
Validate and lint YAML and JSON files online. Free linter with error detection and syntax highlighting.
Keywords
YAML linter, JSON linter, YAML validator, JSON validator, YAML checker, JSON checker
Configuration files power modern systems. This page validates YAML and JSON so you can catch syntax errors early and avoid misconfigurations in deployments.
What is linting?
Linting checks files for structural and stylistic issues before they cause runtime failures. For YAML and JSON, common errors include inconsistent indentation, invalid types, duplicate keys, and stray characters introduced during manual edits.
How validation works
The tool parses content locally and reports errors with line and column positions. It highlights problematic tokens and suggests fixes. You can toggle between formats, paste snippets, or upload files for larger checks—all processed in the browser for privacy.
About the YAML & JSON Linter
Use it to validate CI/CD configuration, infrastructure as code, and application settings. Clean configs reduce outages and speed up reviews. Export results for sharing with teammates during troubleshooting.
FAQ
Why does YAML indentation matter?
YAML uses indentation to denote structure. Misaligned spaces change meaning or trigger errors. Use spaces consistently and avoid mixing tabs and spaces.
Can this replace JSON Schema?
This tool focuses on syntax and common pitfalls. For semantic validation, pair it with JSON Schema or policy checks in your pipeline.
Validating configuration early reduces deployment risk. Make linting part of your standard development workflow.
YAML/JSON Linter
Validate, lint, and format YAML and JSON documents with detailed error reporting
JSON Input
Validation Results
Enter JSON content to see validation results