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JSON Formatter & Validator

Format, validate and minify JSON — with clear, located error messages.

Developer Your files never leave your device.

How to use JSON Formatter & Validator

  1. Paste your JSON

    Drop raw JSON into the source box. It’s validated live as you type, with a green “Valid JSON” check or a located error the moment something’s off.

  2. Pick how it should look

    Choose 2-space, 4-space, or tab indentation, and flip on “Sort keys” to alphabetise every object key for clean, stable diffs.

  3. Format or minify

    Hit Format to pretty-print it, or Minify to collapse everything onto a single compact line for shipping over the wire.

  4. Copy or download

    Grab the result with one click to your clipboard, or download it as a .json file. No round-trip to a server required.

Key features

  • 100% private — your JSON is processed in the browser and never uploaded
  • Pretty-print with 2-space, 4-space, or tab indentation
  • Minify to a single compact line in one click
  • Live validation that points to the exact line and column of any error
  • Optional alphabetical key sorting for clean, diff-friendly output
  • Completely free — no sign-up, no limits, copy or download the result

About JSON Formatter & Validator

Paste raw JSON and instantly pretty-print it with 2-space, 4-space, or tab indentation, optionally sorting every object key alphabetically for clean, stable diffs. Need it compact instead? Minify to a single line in one click. A live validator checks your JSON as you type and, when something is off, points you straight to the offending line and column with a plain-English reason. Copy the result to your clipboard or download it as a .json file. Everything runs entirely in your browser — your data is never uploaded.

Last updated 30 May 2026.

Frequently asked questions

Is my JSON sent to a server?
No. All formatting and validation happens locally in your browser using the built-in JSON engine, so your data never leaves your device and we never see it.
What does the validator tell me when my JSON is invalid?
It shows a plain-English reason — like an unexpected token or a missing comma — along with the exact line and column where the problem is, so you can jump straight to the fix.
What’s the difference between Format and Minify?
Format pretty-prints your JSON with the indentation you choose, making it easy to read. Minify strips all that whitespace to produce the smallest single-line version, ideal for embedding or transmitting.
Does “Sort keys” change my data?
Only the ordering. It re-emits every object’s keys in alphabetical order — values, arrays, and structure stay exactly the same — which is handy for comparing two JSON files cleanly.
Is there a size limit on the JSON I can paste?
There are no artificial limits. Since everything runs on your machine, the only ceiling is your device’s available memory, so even large payloads are fine.
Does it work offline and on mobile?
Yes. Once the page has loaded it runs entirely client-side, so it keeps working without a connection and is fully responsive on phones and tablets.

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