YAML Formatter and Viewer

Format, validate, and visualize YAML documents with tree view and customizable indentation.

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1. Paste your YAML document into the input text area. 2. The formatter validates the syntax and highlights any errors such as tab characters or inconsistent indentation. 3. View the reformatted YAML with clean, consistent indentation in the output area. 4. Switch to the tree view mode to interactively expand and collapse nested nodes for easier navigation. 5. Adjust the indentation level (2 or 4 spaces) to match your project conventions. 6. Click the copy button to copy the formatted YAML to your clipboard.

About This Tool

The YAML Formatter and Viewer formats your YAML documents with consistent indentation, validates the syntax, and provides an interactive tree view for exploring complex configuration structures. It is the essential tool for anyone working with Kubernetes manifests, CI/CD pipelines, Ansible playbooks, or any YAML-based configuration.

YAML is sensitive to indentation and whitespace, which makes it easy to introduce subtle bugs that are hard to spot in raw text. This formatter parses your YAML, catches syntax errors with descriptive messages, and rebuilds the document with clean, consistent formatting. The tree view mode lets you expand and collapse nodes to understand nested structures at a glance.

Beyond formatting, the tool highlights common YAML pitfalls such as tab characters (which are not allowed in YAML), inconsistent indentation levels, and ambiguous values that might be interpreted differently than intended. It supports YAML 1.2 syntax and handles all standard scalar types, mappings, and sequences.

Frequently Asked Questions

Unlike JSON which uses braces and brackets, YAML uses indentation to define structure. Incorrect indentation changes the meaning of your document. A key indented one level too deep becomes a child of the wrong parent, which can cause subtle configuration bugs.
Yes. The tree view is designed to handle large configurations with hundreds of keys. Nodes start collapsed for performance, and you can expand individual sections as needed to explore specific parts of the document.
Yes. The validator catches issues including tab characters, inconsistent indentation, duplicate keys, unquoted strings that look like booleans or numbers, and malformed multiline strings. Error messages include line numbers to help you find problems quickly.
The tool supports YAML 1.2, which is the current standard. It handles all standard data types including strings, integers, floats, booleans, null, timestamps, mappings, and sequences.
Yes. You can set the indentation to 2 spaces (most common for YAML), 4 spaces, or a custom value. The formatter applies your chosen indentation consistently throughout the entire document.

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