YAML Formatter & Validator
How this tool works
The tool parses the provided YAML using the js‑yaml library, validates its syntax, and normalizes indentation based on the selected size. If JSON output is chosen, it converts the parsed object to a formatted JSON string.
Any syntax errors are caught and displayed with line numbers to help you locate issues quickly.
Reference: YAML 1.2 Specification.
What Is YAML Formatter & Validator?
The YAML Formatter & Validator is a lightweight web‑based utility designed for developers who work with configuration files, CI/CD pipelines, and data serialization in YAML. It not only checks for syntactic correctness but also normalizes indentation, making the file easier to read and maintain. Additionally, it offers a one‑click conversion to JSON, allowing seamless integration with tools that consume JSON payloads.
Common Use Cases
Developers often need to ensure that their YAML configuration files are free of syntax errors before deployment. This tool helps catch misplaced colons, incorrect indentation, or invalid scalar values. It’s also handy when migrating legacy YAML configurations to JSON for APIs or when generating human‑readable documentation that requires consistent formatting.
Another frequent scenario is linting YAML files in CI pipelines; by integrating this validator into a pre‑commit hook, teams can enforce a standard style and avoid runtime failures caused by malformed YAML.
Frequently Asked Questions
Can I use this tool offline?
Yes. All processing happens in the browser using the embedded js‑yaml library, so no network request is required after the page loads.
What YAML features are supported?
The validator supports the full YAML 1.2 specification, including anchors, aliases, and complex data structures such as maps and sequences.
Is my data stored on a server?
No. The tool processes the input locally in your browser and does not transmit any content to external servers.