YAML Linter & Formatter

Paste YAML or load a file to validate, prettify, and inspect your documents entirely in the browser.

Input

Upload a .yml/.yaml file or work directly in the editor. Parsing happens locally.

Upload YAML file

Files never leave your device; they are read with the FileReader API.

YAML

Tip: Press Ctrl/Cmd + Enter to format with the current indentation.

Indentation

Validation

Linting runs automatically as you type.

Valid YAML

Documents: 1
Characters: 94
Size: 94 B

Document summary

Document 1object · 3 keys

Formatted YAML

Pretty-printed using the selected indentation.

name: Example
version: 1
items:
  - id: alpha
    active: true
  - id: beta
    active: false

JSON Preview

Inspect the parsed documents as JSON.

{
  "name": "Example",
  "version": 1,
  "items": [
    {
      "id": "alpha",
      "active": true
    },
    {
      "id": "beta",
      "active": false
    }
  ]
}