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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A link to this tool, including input, options and all chained tools.

Input YAML

YAML Status

Can't convert.

An error has occured.

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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Highlight YAML

Quickly color code the syntax of a YAML file.

Prettify YAML

Quickly prettify a YAML configuration file.

Minify YAML

Quickly minify a YAML configuration file.

Validate YAML

Quickly check a YAML file for syntax errors and report them.

Transform YAML into JSON

Quickly convert a YAML config to a JSON config.

Transform JSON into YAML

Quickly convert a JSON file to a YAML file.

Transform YAML into XML

Quickly convert a YAML document to an XML document.

Transform XML into YAML

Quickly convert XML markup to YAML markup.

Transform YAML into CSV

Quickly convert YAML data to CSV data.

Transform CSV into YAML

Quickly convert a YAML dataset to a CSV dataset.

Transform YAML into TSV

Quickly convert YAML format to TSV format.

Transform TSV into YAML

Quickly convert TSV files to YAML files.

Convert YAML to an Image

Quickly convert YAML to a PNG, GIF, JPG or BMP Image.

Base64-encode YAML

Quickly convert YAML to base-64 encoding.

Base64-decode YAML

Quickly convert previously base-64 encoded YAML back to YAML.

URL-encode YAML

Quickly URL-escape a YAML file.

URL-decode YAML

Quickly URL-unescape a YAML file.

Edit and View YAML

Quickly edit a YAML file in a simple YAML editor.

Generate Random YAML

Quickly generate random YAML configs.

Coming soon These yaml tools are on the way

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.

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@browserling

We're Browserling — a friendly and fun cross-browser testing company powered by alien technology. At Browserling we love to make developers' lives easier, so we created this collection of online yaml tools. Unlike many other tools, we made our tools free, without ads, and with the simplest possible user interface. Our online yaml tools are actually powered by our programming tools that we created over the last couple of years. Check them out!

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All conversions and calculations are done in your browser using JavaScript. We don't send a single bit about your input data to our servers. There is no server-side processing at all. We use Google Analytics and StatCounter for site usage analytics. Your IP address is saved on our web server, but it's not associated with any personally identifiable information. We don't use cookies and don't store session information in cookies. We use your browser's local storage to save tools' input. It stays on your computer.

By using Online Yaml Tools you agree to our Terms of Service. TLDR: You don't need an account to use our tools. All tools are free of charge and you can use them as much as you want. You can't do illegal or shady things with our tools. We may block your access to tools, if we find out you're doing something bad. We're not liable for your actions and we offer no warranty. We may revise our terms at any time.