yaml

.yaml — YAML Ain't Markup Language

Clark Evans, Oren Ben-Kiki, and Ingy döt Net · 2001

Developer

Clark Evans, Oren Ben-Kiki, and Ingy döt Net

What is a .yaml file?

YAML is a human-readable data serialization standard that is commonly used for configuration files and in applications where data is being stored or transmitted. It is designed to be easily readable by humans and easily processed by computers, making it a popular choice for developers. Its flexible syntax allows for representing complex data structures like lists and dictionaries in a clear and concise manner.

Programs That Open .yaml Files

Platform	Program
Windows	Notepad++	Free
	Visual Studio Code	Free
	Sublime Text	Paid
macOS	Visual Studio Code	Free
	Sublime Text	Paid
	TextEdit	Free	Official

Common Problems with .yaml Files

⚠️ Incorrect indentation

Ensure consistent use of spaces (not tabs) for indentation, and verify that the number of spaces per level is correct.

⚠️ Invalid syntax

Check for misplaced characters, incorrect quoting, or missing colons and hyphens according to YAML specifications.

⚠️ Data type parsing errors

Ensure that string values are correctly quoted if they contain special characters or resemble numbers/booleans. Verify that complex data structures are properly defined.

Frequently Asked Questions

What is YAML used for?▼

YAML is primarily used for configuration files due to its human-readable nature. It's also used for data serialization in applications, inter-process messaging, and object persistence.

Is YAML case-sensitive?▼

Yes, YAML is case-sensitive. This means that 'Key' and 'key' are treated as distinct keys.

Can YAML contain comments?▼

Yes, YAML supports comments. Anything following a '#' symbol on a line is considered a comment and is ignored by parsers.

Technical Details

YAML uses indentation to denote structure, making it highly readable. It typically begins with document start indicators like '---' and document end indicators like '...'.

Did You Know?

The name 'YAML' is a recursive acronym, originally standing for 'Yet Another Markup Language', but now officially 'YAML Ain't Markup Language' to emphasize its data-oriented nature.

YAML's syntax is inspired by languages like C, Perl, and Python, aiming for clarity and ease of use.

YAML's indentation-based structure is similar to Python's, which contributes to its readability.

Security Information

YAML itself is generally safe as it's a data format. However, be cautious when parsing YAML from untrusted sources, as complex or malicious structures could potentially lead to denial-of-service attacks or unexpected behavior in applications that process it.