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YAML Validator

World's simplest yaml tool
Quickly check Yet Another Markup Language syntax for errors. Enter your YAML in the input box below and you'll immediately get its syntax validated. Enter YAML, get it validated. There are no ads or downloads, and everything works right in your browser. Made for developers by developers from team Browserling.
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What is a YAML Validator?

learn more about this tool
This YAML validator checks the syntax of YAML (Yet Another Markup Language) data. If there are mistakes, then it returns a detailed syntax error message that explains what happened. It also tells the position of error and displays the conflicting snippet.

YAML Validator examples

Click to use
Invalid YAML Syntax
Invalid YAML file. It displays and error and a explains what happened.
plain text is not yaml
Valid YAML Syntax
Valid YAML data without any errors. All checks pass and you get a green badge.
list: - entry1 - entry2 - entry3
Pro tips Master online yaml tools
You can pass input to this tool via ?input query argument and it will automatically compute output. Here's how to type it in your browser's address bar. Click to try!
https://onlineyamltools.com/validate-yaml?input=plain%0Atext%0Ais%0Anot%0Ayaml
All yaml tools
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Quickly color code the syntax of a YAML file.
Quickly prettify a YAML configuration file.
Quickly minify a YAML configuration file.
Quickly check a YAML file for syntax errors and report them.
Quickly convert a YAML config to a JSON config.
Quickly convert a JSON file to a YAML file.
Quickly convert a YAML document to an XML document.
Quickly convert XML markup to YAML markup.
Quickly convert YAML data to CSV data.
Quickly convert a YAML dataset to a CSV dataset.
Quickly convert YAML format to TSV format.
Quickly convert TSV files to YAML files.
Quickly convert YAML to a PNG, GIF, JPG or BMP Image.
Quickly convert YAML to base-64 encoding.
Quickly convert previously base-64 encoded YAML back to YAML.
Quickly URL-escape a YAML file.
Quickly URL-unescape a YAML file.
Quickly edit a YAML file in a simple YAML editor.
Quickly generate random YAML configs.
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Diff Two YAML Files
Compare two YAML files and show their differences.
Show YAML Statistics
Show detailed information about a YAML config.
Flatten YAML
Quickly flatten a nested YAML config file.
Truncate YAML
Loop over YAML and truncate lists, arrays, and strings.
Create a PHP Array from YAML
Convert YAML config to a PHP data structure.
Convert YAML to Properties
Convert a YAML file to a properties file.
Convert Properties ot YAML
Convert a properties file to a YAML file.
Convert YAML to TOML
Convert a YAML file to a TOML file.
Convert TOML to YAML
Convert a TOML config to a YAML config.
Convert YAML to NestedText
Convert a YAML file to a NestedText file.
Convert NestedText to YAML
Convert a NestedText config to a YAML config.
Convert YAML to PDF
Create a PDF file from a YAML file.
Sort YAML
Sort a YAML file by keys or by values.
Extract Keys from YAML
Find and extract all keys from a YAML file.
Extract Values from YAML
Find and extract all keys from a YAML file.
Extract Strings from YAML
Find and extract all strings from a YAML file.
Extract Numbers from YAML
Find and extract all numbers from a YAML file.
Extract Comments from YAML
Find and extract all comments from a YAML file.
Remove Comments from YAML
Clean up a YAML configuration file from comments.
Add Errors to YAML
Add tiny errors to YAML and create an invalid YAML file.
Change All Quotes to Double Quotes
Normalize all quotes in a YAML file to double quotes.
Change All Quotes to Single Quotes
Normalize all quotes in a YAML file to single quotes.
Visualize YAML Structure
Create an abstract image that represents YAML data.