Free YAML Viewer Online

View YAML with syntax highlighting and toggle to JSON view — free, browser-only, no server.

YAML Input

View Output

What Is a YAML Viewer?

You've got a YAML config — a Kubernetes manifest, a Docker Compose file, a GitHub Actions workflow — and you just want to read it clearly without fighting indentation. This tool gives you syntax-highlighted YAML 1.2 rendering so keys, values, strings, and booleans are color-coded at a glance. Hit JSON View to see the same data as pretty-printed JSON — great for spotting type coercion or verifying the parsed structure before you deploy.

Both views are produced by JavaScript running in this tab. The manifest is parsed locally and never posted anywhere, so a Helm values file full of secrets or a production Compose file is fine to paste here.

YAML Viewer Examples

Paste YAML and view it with syntax highlighting, or switch to JSON View to inspect the parsed structure:

Example: Person record

YAML Input:

YAML Input

JSON View output:

JSON View

How to Use This Tool

1

Paste or Upload YAML

Drop a manifest straight into the editor on the left, or press Upload and pick a .yaml or .yml file from disk. Not sure what to try first? Sample fills in a small document to look at.

2

Choose View Mode

Use the YAML View button to see the formatted YAML with syntax highlighting. Use JSON View to parse the YAML and display the data as pretty-printed JSON.

3

Copy or Download

Copy sends the current view to the clipboard, and Download writes the same text out to disk. For a dedicated conversion, head over to the YAML to JSON tool.

Frequently Asked Questions

Is my YAML data private when using this viewer?

Yes. The YAML is parsed by JavaScript inside this page and never leaves your machine. Keep the DevTools Network panel open as you paste a manifest and it stays empty. That makes it fine for Kubernetes manifests, API keys, tokens and production configs.

What is the difference between YAML View and JSON View?

YAML View normalizes and displays your YAML with syntax highlighting — colors for keys, strings, numbers, and booleans. JSON View parses the YAML and renders the structured data as pretty-printed JSON, which is useful for inspecting parsed values and types. See the YAML 1.2 spec for more on how values are parsed.

Can I use the YAML Viewer to convert YAML to JSON?

The JSON View shows a JSON representation of your YAML. For a dedicated converter with download and copy features, use the YAML to JSON tool.

What YAML features are supported?

Basic key-value pairs, nested objects, lists, and scalar types (strings, numbers, booleans, null) are supported in both views. Complex YAML anchors and aliases may not be fully parsed in JSON View. For full YAML support, see yaml.org.

How is the YAML Viewer different from the YAML Parser?

The YAML Viewer focuses on displaying YAML with syntax highlighting and letting you toggle to a JSON view. The YAML Parser focuses on inspecting the parsed data structure and types. Both run entirely in the browser.

Related Tools

YAML Formatter YAML Validator YAML Parser YAML to JSON JSON Formatter

For more on YAML, see the YAML 1.2 specification and yaml.org.