TToolsKit

JSON Formatter

Paste messy JSON, get clean, indented JSON back. Validates as you type.

Paste, drop a file, or .

The simplest, fastest JSON formatter online. Paste any JSON and get it back formatted, validated, and (optionally) sorted by keys. If your JSON is broken, we'll point to the exact line and character. Everything runs in your browser — nothing is sent to a server, so you can safely format JSON that contains API keys, tokens, or personal data.

How to use json formatter

  1. 1
    Paste your JSON

    Drop it into the input box. You can paste from clipboard or drag a .json file over the box.

  2. 2
    Pick your action

    Beautify to pretty-print, minify to strip whitespace. Choose your indent size and whether to sort keys.

  3. 3
    Copy the result

    Click Copy to clipboard, or Download to save as a .json file.

Frequently asked questions

Is my JSON sent to a server?
Never. All formatting and validation happens in your browser — you can use this tool completely offline after the page loads.
What if my JSON is invalid?
We'll show the exact line and column where parsing failed, with a readable error message.
Can it handle huge JSON files?
Yes — we've tested files up to 50 MB. Very large files may briefly freeze the browser tab.
Does it support JSON5 or JSONC (with comments)?
Not yet. Strict JSON only. JSON5 support is on our roadmap.
Why sort keys?
Sorted keys make it easier to diff two JSON documents and spot structural differences.