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YAML Validator
Validate whether YAML syntax is correct.
Overview
- Checks whether the YAML you enter is syntactically correct.
- Unlike YAML Formatter, the result is not formatted YAML but a validity verdict and, when invalid, the error details.
- Helps catch YAML-specific syntax mistakes early, such as incorrect indentation or the use of tab characters.
Usage
- Enter the YAML you want to validate into the text area.
- Click the "Validate" button.
- If the syntax is correct, "This is valid YAML." is displayed; otherwise, the error location and cause are shown.
Example
Input
name: Taro age: 20
Output
This is valid YAML.
Use Cases
- Validating a manually edited YAML configuration file (Docker Compose, Kubernetes, etc.) before saving it
- Locally pre-checking that generated YAML is syntactically correct before wiring it into a CI/CD pipeline
- Checking that YAML output by another tool or script is not broken
FAQ
Is the YAML I enter sent anywhere?
No. All validation happens entirely in your browser and is never sent to an external server.
Is the location of an error shown?
Yes. Whenever possible, a message including the line, column, and cause of the error is shown.
Can validation modify the input content?
No. This tool only validates the input and never modifies it.
Notes
- The result only judges syntactic correctness. It does not check the meaning of values or a schema, such as whether required fields are present.
- YAML does not allow tab characters for indentation. Use spaces instead.
- Validating very large YAML data may make browser processing slow.
Related Tools
Format YAML to make it easier to read.
Convert JSON into YAML format.
Validate whether JSON is correctly formatted.