Is my JSON uploaded anywhere?

No. The formatter runs entirely in your browser using JavaScript. Nothing is sent to our servers.

Can I convert JSON to YAML?

Yes. Use the JSON ⇄ YAML tab to convert in either direction for common data types (objects, arrays, numbers, strings, booleans, null).

Why does formatting fail?

Malformed JSON (like trailing commas or unquoted keys) will fail. The validator points to the exact line and column to help you fix it.

{ }

JSON Formatter

Validate, pretty-print, and minify JSON. View an expandable tree, sort keys, convert JSON ⇄ YAML, copy/download, and check size & lines. All in your browser.

⚡ Fast & private 🧩 Tree viewer 🔃 JSON ⇄ YAML JSON Diff UUID

JSON input 0 B · 0 lines

Load file

invalid

Drag & drop a .json file here

Extras

URL encode

Base64

Tips

JSON requires double-quoted keys & strings. Remove trailing commas.
Use “Sort keys” for stable diffs in Git.
Switch to YAML for configs; convert back to JSON for APIs.

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