YAML Formatter

Overview

• Formats YAML with broken indentation, or YAML written in flow style ({} or []), into a readable block style.
• Useful for keeping YAML configuration files, such as Docker Compose, Kubernetes, or GitHub Actions, readable while editing or reviewing them.
• Also handles YAML-specific multi-line strings (block scalars) and flow-style arrays and mappings.

Usage

1. Enter the YAML you want to format into the text area.
2. Click the "Format" button.
3. The result, formatted into a readable style, is displayed below. Use the "Copy" button to copy it to the clipboard.

Example

name: Taro
age: 20
hobbies: [reading, coding]

name: Taro
age: 20
hobbies:
  - reading
  - coding

Use Cases

• Fixing a YAML configuration file whose indentation got messed up through manual editing or another tool's output
• Converting flow-style YAML into a block style that is easier to review
• Formatting a YAML file into a readable style before including it in a code review or documentation

FAQ

Notes

• Entering syntactically invalid YAML, such as with inconsistent indentation, results in an error.
• Comments (lines starting with #) may not be preserved in the formatted result. We recommend keeping a note of important comments before formatting.
• Formatting very large YAML data may make browser processing slow.