View, format, and validate YAML (.yaml, .yml) files online - completely free and fully in your browser. Get syntax highlighting, an interactive tree view, clear error messages, and one-click YAML to JSON conversion. Working with other formats? Try our CSV Viewer, XML Viewer, TXT Viewer, or browse all file viewers.
or click to browse - view it instantly in your browser
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Drag and drop a .yaml or .yml file onto the upload area, click to browse, paste YAML text directly, or fetch it from a URL. Everything is read locally in your browser - nothing is uploaded.
The viewer parses your YAML instantly and applies color-coded syntax highlighting. If there is a problem, you get a clear error message with the exact line and column so you can fix it in seconds.
Toggle between Formatted, Tree View, and As JSON. Expand or collapse nested nodes in the tree, then copy the result or download it as YAML or JSON.
Every file is validated as it loads, with detailed error messages that pinpoint the line and column of any problem.
Color-coded output makes it easy to tell keys, strings, numbers, booleans, and comments apart at a glance.
Expand and collapse nested objects and arrays to navigate deep, complex configuration files with ease.
Convert your YAML to clean, formatted JSON in one click - ready to copy or download for APIs and tooling.
The viewer follows the site theme, with a comfortable dark mode for long editing sessions and a clean light default.
All processing happens in your browser. Your configuration files and secrets never leave your device.
YAML (YAML Ain't Markup Language) is a human-readable data serialization format used heavily for configuration. It powers DevOps and cloud tools like Docker Compose, Kubernetes, Ansible, and GitHub Actions, as well as countless application settings files. A dependable YAML viewer lets you read and check these files on any device with a browser, no editor or command line required.
Because YAML relies on indentation rather than brackets, a single stray space can break a whole file. This viewer validates as you go and highlights structure so mistakes are easy to spot. If you also work with tabular or markup data, the CSV Viewer and XML Viewer cover those formats, and the JS/CSS Minifier helps trim front-end assets.
# Configuration file
server:
host: localhost
port: 8080
ssl: true
database:
name: myapp
users:
- admin
- guestYAML is a superset of JSON, designed to be easier for people to read and write. YAML uses indentation and supports comments, while JSON is more compact and universally supported by programming languages and APIs. With this tool you can move between the two instantly using the As JSON view.
Drag your .yaml or .yml file onto the upload area, or click to browse. You can also paste YAML text or fetch it from a URL. The file is parsed directly in your browser - no upload, no signup - and the formatted, tree, and JSON views appear immediately.
This viewer supports .yaml and .yml files, plus plain-text YAML you paste or load from a URL. For other formats, try the CSV Viewer, JSON Viewer, XML Viewer, or TXT Viewer.
Yes. All YAML parsing happens locally in your browser using JavaScript. Your files are never uploaded to any server, which makes the tool safe for configuration files, secrets, and private data.
Yes. After parsing your YAML, switch to the As JSON view to see the equivalent JSON. You can then copy it or download it as a .json file for use with APIs and other tools.
YAML is a superset of JSON designed to be more human-readable. It uses indentation instead of brackets, supports comments, and has more flexible syntax. JSON is more compact and is natively supported by most programming languages and APIs.
YAML is sensitive to indentation. The most common causes are mixing tabs with spaces, inconsistent indentation levels, a missing colon after a key, or an unquoted value with special characters. The error message shows the exact line and column so you can find the problem quickly. Still having trouble? Please contact us and we'll be happy to help!
Uploads are capped at 5 MB, which covers virtually every real-world configuration file. Because parsing runs on your own device, very large files depend on your browser and memory rather than any server limit.