Developer Tools

YAML Viewer - Online YAML Editor & Validator

Open and edit YAML online, validate syntax, and convert YAML to JSON. Visualize the data structure in real time in your browser, no signup required.

YAML Editor

0 chars

Tree View

Awaiting valid YAML

Enter valid YAML to see the tree view

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How to use the YAML Viewer

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Paste your YAML content into the editor on the left. The tool will automatically validate the syntax and convert it to JSON on the right. You can also see a tree view of the structure.

Key Features

Real-time Validation

Instantly detects syntax errors and provides helpful feedback.

Interactive Tree View

Navigate complex YAML structures with collapsible nodes.

JSON Conversion

Easily convert and download your YAML data as JSON.

Paste YAML into this online viewer to instantly validate its syntax, explore the data as a collapsible tree, and convert it to JSON in real time. The tool flags parse errors with helpful messages, lets you upload or drag-and-drop files, and runs entirely in your browser—no signup and nothing is uploaded to a server.

How to Use the YAML Viewer

  1. 1

    Paste or upload your YAML

    Type YAML into the editor, paste it from the clipboard, or drag and drop a .yaml/.yml file into the input panel.

  2. 2

    Check validation feedback

    The viewer parses your input as you type and highlights syntax errors with a clear message so you can fix indentation or mapping issues fast.

  3. 3

    Explore the tree view

    Browse the parsed structure as a collapsible tree to inspect nested mappings, sequences, and scalar values at a glance.

  4. 4

    Convert and export to JSON

    Read the equivalent JSON in the output panel, then copy it to your clipboard or export it as a .json file.

References

  • YAML 1.2.2 Specification

    The official YAML specification defining syntax, indentation rules, mappings, sequences, and the YAML data model.

  • RFC 8259 — JSON

    The IETF specification for the JSON data interchange format produced by the viewer's conversion output.

  • MDN — JSON

    Reference for the JSON format and the JavaScript APIs used to parse and serialize it.

Related Tools

YAML to JSON

Convert YAML files directly into clean, formatted JSON.

JSON Formatter

Beautify, validate, and format the JSON produced by this viewer.

XML Viewer

View, validate, and explore XML documents as a tree.

JSON to XML

Transform JSON output into an equivalent XML structure.

Frequently Asked Questions

What is a YAML viewer?
A YAML viewer is an online tool that parses YAML text, validates its syntax, and displays the data as a readable, collapsible tree while converting it to JSON. It helps you inspect configuration files and serialized data without installing an editor.
Does this YAML viewer work online without installing anything?
Yes. It runs entirely in your browser—on Windows, macOS, or any system with a modern browser like Chrome—so there is no download, extension, or signup required.
Can I convert YAML to JSON with this tool?
Yes. As you edit, the viewer converts valid YAML into equivalent JSON in the output panel, which you can copy to the clipboard or export as a .json file.
How does the viewer validate YAML?
The tool parses your input in real time and reports parse errors with a clear message, helping you catch common problems such as incorrect indentation or malformed mappings before you use the file.
Is my YAML data sent to a server?
No. All parsing, validation, and conversion happen locally in your browser, so your YAML content never leaves your device.
What file types can I open?
You can paste YAML text directly or upload and drag-and-drop .yaml and .yml files into the editor.