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JSON Formatter & Validator — Free Beautifier

Paste JSON to format, validate, minify or copy. Works entirely in your browser — your data never leaves your device.

Formatted JSON appears here...

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About this tool

Format, validate and minify JSON

Paste raw JSON to pretty-print it with clean indentation and syntax highlighting, or minify it to a single compact line for smaller API payloads. Invalid JSON? It points to the exact error so you can fix it fast.

Common fixes

  • Trailing commas — valid in JS, invalid in JSON.
  • Single quotes — JSON needs double quotes on keys and strings.
  • Unquoted keys — every key must be a quoted string.

Private by design

Everything runs in your browser — paste API responses, config or secrets; none of it is uploaded.

How to use the JSON Formatter & Validator

Takes about a minute. No signup, no download, your data stays in your browser.

  1. 1
    Open the tool. Scroll up to the JSON Formatter & Validator above — it loads instantly in your browser, no install needed.
  2. 2
    Enter your values. The fields come pre-filled with realistic defaults so you can see how it works — replace them with your own numbers.
  3. 3
    Read the result. The output updates instantly. Copy or share it — nothing is uploaded to a server, everything stays on your device.

Frequently asked questions

Common questions about the JSON Formatter & Validator.

How do I format or beautify JSON?

Paste your JSON and it’s instantly indented and color-highlighted — then copy the clean output.

How do I minify JSON?

Use the minify option to strip all whitespace into one compact line — smaller payloads for APIs and storage.

Why does it say my JSON is invalid?

It points to the syntax error — usually a trailing comma, a missing quote, or an unmatched bracket. Fix the highlighted spot and it re-validates.

Is my JSON sent to a server?

No — formatting and validation run entirely in your browser, so your data never leaves your device.

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