YAML ⇄ JSON Converter

Key features

• Both directions in one tool: YAML → JSON produces pretty-printed JSON with your choice of 2- or 4-space indent; JSON → YAML produces clean block-style YAML.
• Multi-document YAML is handled: files with --- separators convert to (or from) a JSON array of documents instead of failing.
• Real file support — upload or drag & drop a .yaml, .yml or .json file up to 10 MB, or just paste text; a file chip shows the loaded name and size.
• Parser errors are shown verbatim from js-yaml and JSON.parse with a mark of the offending line — never swallowed, never a crash.
• Optional alphabetical key sorting applies to either direction, handy for diffing generated configs.

How it works

1. 1

   Choose the direction

   Switch between the YAML → JSON and JSON → YAML tabs. Each side remembers its own input, delimiter of options and last file.

2. 2

   Paste text or upload a file

   Type or paste directly, or drop a file onto the input panel. Reading happens in your browser with FileReader — nothing is uploaded.

3. 3

   Copy or download the result

   The conversion lands in a bounded scroll panel. Copy it, or download converted.json / converted.yaml.

Tips for better results

• 💡JSON is a subset of YAML — if a JSON snippet fails to parse as YAML, check for tab characters, which YAML forbids for indentation.
• 💡Anchors (&anchor) and merge keys (<<) are resolved by js-yaml during conversion, so the JSON output contains the fully expanded data.
• 💡For Kubernetes manifests, converting one document at a time keeps output readable; the array path is there when you need the whole file in one go.

Frequently asked questions