The Advanced YAML Syntax Cheatsheet

The Advanced YAML Syntax Cheatsheet

The Advanced YAML Syntax Cheatsheet. YAML (YAML Ain’t Markup Language) Enjoy this cheat sheet at its fullest within Dash. A full list of YAML escape sequences can be found in syntax the official YAML Specification. A look at validator, parser, separators, directives, and more. A look at validator, parser, separators, directives, and more

A look at validator, parser, separators, directives, and more

YAML (YAML Ain’t Markup Language) is a data serialization language used to create key-value pair configuration files and app APIs. It’s a superset of JSON and is formatted using line breaks and whitespace to improve readability.

While not a daily-use technology, it’s an important foundation for many modern technologies like Ansible and is, therefore, a prerequisite for higher-paying developer roles.

Today, we’ll help you perfect your YAML knowledge so you can impress your next interviewer.

New to YAML? You might want to give  this article a quick read before proceeding.

Here’s what we’ll cover today:

  • Validator and parser
  • Anchors and alias
  • Schemas
  • Escape sequences
  • Separators and directives
  • Wrapping up

Validator and Parser

While YAML is more readable than XML, it’s easy to miss formatting mistakes like the number of spaces across a multi-line section or forgetting newline markers. These can cause sweeping errors for the YAML parser that interprets YAML into more machine-readable actions.

Parsing errors are hard to find by hand, so many developers choose to use a web validator or linter. These tools review your YAML document and highlight any potential errors to ensure you have valid YAML before putting it into use.

The most popular validator is YAMLLint, a free open source tool available in your browser or on GitHub. YAMLLint is considered the most convenient linter because it provides error highlighting, auto-formatting for copy/pasted YAML, and auto-correct options.

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