Since YAML relies heavily on exact spacing and indentation, it's very easy to make syntax errors. Validating ensures your files will work correctly in production.

Is my data sent to a server?

No, the validation is performed locally in your browser using JavaScript.

Free Online YAML Validator | Lint YAML Data

What is the YAML Validator?

The YAML Validator checks your YAML data for syntax errors and helps you identify exact line numbers where indentation or formatting issues exist.

What is the Free Online YAML Validator | Lint YAML Data?

The Free Online YAML Validator | Lint YAML Data is a free, privacy-first tool that runs entirely in your browser. It is designed for developers, analysts, and anyone who needs to quickly and securely process data without uploading it to an untrusted third-party server.

Features

Privacy First: Your data never leaves your device.
Lightning Fast: Everything is processed instantly using client-side JavaScript.
Easy to Use: A clean, distraction-free interface built for professionals.

How to use this tool

Paste or enter your data into the input field.
The tool will automatically process your input.
Review the results on the screen.
Copy or download the output as needed.